Recent prospects, challenges and advancements of photocatalysis as a wastewater treatment method

Abstract

The climate crisis, unrestrained use of water resources, and rising population demands have amplified the urgency for sustainable and eco-friendly wastewater treatment solutions. Conventional methods often fail to degrade emerging and persistent pollutants produced by industries, driving the need for alternative technologies. In this context, photocatalysis has emerged as a promising and effective method, offering superior degradation of contaminants and cost-effective application, especially with its advancements in recent years. As an advanced oxidation process (AOP), photocatalysis is particularly well-suited to address the limitations of traditional treatments. This review paper explores the types of photocatalysts and their operational mechanisms, examines the key parameters affecting degradation efficiency, such as operating conditions and photoreactor design, and analyzes recent developments in wastewater effluents containing emerging contaminants over the past five years. Lastly, this review proposes the integration of photocatalysis with other treatment technologies and presents potential future directions for research.

Keywords

Photocatalysis / wastewater treatment / emerging contaminants / photoreactors / combined technologies / future direction

References

[1] Zhang D,Ahmad N.Water scarcity and sustainability in an emerging economy: a management perspective for future.Sustainability2021;13:144

[2] van Vliet MTH,Flörke M.Global water scarcity including surface water quality and expansions of clean water technologies.Environ Res Lett2021;16:024020

[3] Morin-Crini N,Liu G.Worldwide cases of water pollution by emerging contaminants: a review.Environ Chem Lett2022;20:2311-38

[4] Saravanan A,Jeevanantham S.Effective water/wastewater treatment methodologies for toxic pollutants removal: processes and applications towards sustainable development.Chemosphere2021;280:130595

[5] United Nations Environment Programme. Stockholm Convention on Persistent Organic Pollutants (POPs). https://www.pops.int/. (accessed 28 May 2025)

[6] Ma D,Lai C.Critical review of advanced oxidation processes in organic wastewater treatment.Chemosphere2021;275:130104

[7] Li H,Liu P.Ammonia-nitrogen removal from water with gC₃N₄-rGO-TiO₂ Z-scheme system via photocatalytic nitrification-denitrification process.Environ Res2022;205:112434

[8] Ren G,Wang Y.Recent advances of photocatalytic application in water treatment: a review.Nanomaterials2021;11:1804 PMCID:PMC8308214

[9] Ajmal A,Malik RN,Nadeem MA.Principles and mechanisms of photocatalytic dye degradation on TiO₂ based photocatalysts: a comparative overview.RSC Adv2014;4:37003-26

[10] Wang H,Chen Z.Semiconductor heterojunction photocatalysts: design, construction, and photocatalytic performances.Chem Soc Rev2014;43:5234-44

[11] Datta P.Recent development of photocatalytic application towards wastewater treatment.Catal Res2023;3:1-23

[12] Rahim Pouran, S.; Abdul Aziz, A. R.; Wan Daud, W. M. A. Review on the main advances in photo-fenton oxidation system for recalcitrant wastewaters.J Ind Eng Chem2015;21:53-69

[13] Lee D,Danish M.State-of-the-art review on photocatalysis for efficient wastewater treatment: attractive approach in photocatalyst design and parameters affecting the photocatalytic degradation.Catal Commun2023;183:106764

[14] Ahuja T,Saxena K.Recent advances in photocatalytic materials and their applications for treatment of wastewater: a review.J Water Process Eng2023;53:103759

[15] Jorfi S,Ahmadi M.Enhanced coagulation-photocatalytic treatment of Acid red 73 dye and real textile wastewater using UVA/synthesized MgO nanoparticles.J Environ Manage2016;177:111-8

[16] Souza RP,Domingues FS.Photocatalytic activity of TiO₂, ZnO and Nb₂O₅ applied to degradation of textile wastewater.J Photochem Photobiol A2016;329:9-17

[17] García-Muñoz P,Zazo JA.Treatment of hospital wastewater through the CWPO-photoassisted process catalyzed by ilmenite.J Environ Chem Eng2017;5:4337-43

[18] Che W,Deng F.Facile solvothermal fabrication of cubic-like reduced graphene oxide/AgIn₅S₈ nanocomposites with anti-photocorrosion and high visible-light photocatalytic performance for highly-efficient treatment of nitrophenols and real pharmaceutical wastewater.Appl Catal A Gen2018;565:170-80

[19] Mahdizadeh F.Treatment of textile wastewater under visible LED lamps using CuO/ZnO nanoparticles immobilized on scoria rocks.RSC Adv2015;5:75474-82

[20] Ahmad I,Yan J.Semiconductor photocatalysts: a critical review highlighting the various strategies to boost the photocatalytic performances for diverse applications.Adv Colloid Interface Sci2023;311:102830

[21] Bahadoran A,Masudy-Panah S.Photocatalytic materials obtained from E-waste recycling: review, techniques, critique, and update.JMMP2022;6:69

[22] Chen Y,Wen J.Selective recovery of precious metals through photocatalysis.Nat Sustain2021;4:618-26

[23] Hong J,Presser V.Recent advances in wastewater treatment using semiconductor photocatalysts.Curr Opin Green Sustain Chem2022;36:100644

[24] Bai S,Gao C.Defect engineering in photocatalytic materials.Nano Energy2018;53:296-336

[25] Wang J,Zhang Y,Zhu L.Underneath mechanisms into the super effective degradation of PFOA by BiOF nanosheets with tunable oxygen vacancies on exposed (101) facets.Appl Catal B Environ2021;286:119911

[26] Wu Y,Fang C.Highly efficient degradation of perfluorooctanoic acid over a MnO_x-modified oxygen-vacancy-rich In₂O₃ photocatalyst.ChemCatChem2019;11:2297-303

[27] Núñez-Salas RE,Hinojosa-Reyes L,Villanueva-Rodríguez M.Cyanide degradation in aqueous solution by heterogeneous photocatalysis using boron-doped zinc oxide.Catal Today2019;328:202-9

[28] Aboutaleb WA.Effect of Fe₂O₃-CeO₂ nanocomposite synthesis method on the Congo red dye photodegradation under visible light irradiation.Mater Chem Phys2019;236:121724

[29] Shabbir A,Mumtaz A.Mechanistic investigations of emerging type-II, Z-scheme and S-scheme heterojunctions for photocatalytic applications - a review.J Alloys Compd2024;1003:175683

[30] Abbood NS,Khader EH,Albayati TM.Photocatalytic degradation of cefotaxime pharmaceutical compounds onto a modified nanocatalyst.Res Chem Intermed2023;49:43-56

[31] He X,Ding P.Heterojunction photocatalysts for degradation of the tetracycline antibiotic: a review.Environ Chem Lett2021;19:4563-601 PMCID:PMC8403697

[32] Morshedy AS,Zaki T,Alghamdi MM.A review on heterogeneous photocatalytic materials: mechanism, perspectives, and environmental and energy sustainability applications.Inorg Chem Commun2024;163:112307

[33] Khurram R,Ehsan MF.α-Fe₂O₃-based nanocomposites: synthesis, characterization, and photocatalytic response towards wastewater treatment.Environ Sci Pollut Res Int2021;28:17697-711

[34] Kumar A,He J.Recent developments and challenges in practical application of visible-light-driven TiO₂-based heterojunctions for PPCP degradation: a critical review.Water Res2020;170:115356

[35] Paul T,Das BK,Maiti S.CsPbBrCl₂/g-C₃N₄ type II heterojunction as efficient visible range photocatalyst.J Hazard Mater2019;380:120855

[36] Cui H,Wang K,Huang T.Synthesis of a novel Type-II In₂S₃/Bi₂MoO₆ heterojunction photocatalyst: excellent photocatalytic performance and degradation mechanism for Rhodamine B.Sep Purif Technol2021;255:117758

[37] Opoku F,van Sittert CGCE.Recent progress in the development of semiconductor-based photocatalyst materials for applications in photocatalytic water splitting and degradation of pollutants.Adv Sustain Syst2017;1:1700006

[38] Wen X,Fei Z.Recent developments on AgI based heterojunction photocatalytic systems in photocatalytic application.Chem Eng J2020;383:123083

[39] Li J,Fang H,Rui Z.Plasmonic metal bridge leading Type III heterojunctions to robust Type B photothermocatalysts.Ind Eng Chem Res2021;60:8420-9

[40] Jiang X,Zhang M.A novel direct Z-scheme heterojunction BiFeO₃/ZnFe₂O₄ photocatalyst for enhanced photocatalyst degradation activity under visible light irradiation.J Alloys Compd2022;912:165185

[41] Luo J,Zhan L.Facile construction of a fascinating Z-scheme AgI/Zn₃V₂O₈ photocatalyst for the photocatalytic degradation of tetracycline under visible light irradiation.Sep Purif Technol2021;255:117691

[42] Chen M,Hou S.A novel Z-scheme AgBr/P-g-C₃N₄ heterojunction photocatalyst: excellent photocatalytic performance and photocatalytic mechanism for ephedrine degradation.Appl Catal B Environ2020;266:118614

[43] Xu Q,Yu J,Al-Ghamdi AA.Direct Z-scheme photocatalysts: principles, synthesis, and applications.Mater Today2018;21:1042-63

[44] Beshkar F,Amiri O,Mousavi-Kamazani M.Visible light-induced degradation of amoxicillin antibiotic by novel CuI/FePO₄ p-n heterojunction photocatalyst and photodegradation mechanism.J Alloys Compd2022;892:162176

[45] Hasija V,Sudhaik A.Step-scheme heterojunction photocatalysts for solar energy, water splitting, CO₂ conversion, and bacterial inactivation: a review.Environ Chem Lett2021;19:2941-66

[46] Fan H,Li W,Zhou G.Facile fabrication of 2D/2D step-scheme In₂S₃/Bi₂O₂CO₃ heterojunction towards enhanced photocatalytic activity.Appl Surf Sci2020;504:144351

[47] Di Bartolomeo, A. Graphene Schottky diodes: an experimental review of the rectifying graphene/semiconductor heterojunction.Phys Rep2016;606:1-58

[48] Kumari P,Kong L,Merenda A.Engineering Schottky-like and heterojunction materials for enhanced photocatalysis performance - a review.Mater Adv2022;3:2309-23

[49] Graimed BH,Jabbar ZH,Ammar SH.Highly stable β-Bi₂O₃/Ag decorated nanosilica as an efficient Schottky heterojunction for ciprofloxacin photodegradation in wastewater under LED illumination.Mater Sci Semicond Process2022;156:107303

[50] Manassero A,Alfano OM.Photocatalytic reactors with suspended and immobilized TiO₂: comparative efficiency evaluation.Chem Eng J2017;326:29-36

[51] Joseph A.Review on support materials used for immobilization of nano-photocatalysts for water treatment applications.Inorg Chim Acta2023;545:121284

[52] Goutham R,Srikanth B.Supporting materials for immobilisation of nano-photocatalysts. In: Inamuddin, Sharma G, Kumar A, Lichtfouse E, Asiri AM, editors. Nanophotocatalysis and environmental applications. Cham: Springer International Publishing; 2019. pp. 49-82.

[53] Robert D,Keller N.Immobilization of a semiconductor photocatalyst on solid supports: methods, materials, and applications. In: Pichat P, editor. Photocatalysis and water purification. Wiley; 2013. pp. 145-78.

[54] Karavasilis MV.Use of immobilized zinc oxide photocatalysts for wastewater treatment: application to methylene blue degradation.Can J Chem Eng2022;100:893-910

[55] Chairungsri W,Kijjanapanich P.Direct dye wastewater photocatalysis using immobilized titanium dioxide on fixed substrate.Chemosphere2022;286:131762

[56] Yusuf AO,Al-Sakkaf R.Photocatalytic degradation of diclofenac amide in a fixed-bed reactor using TiO₂/β-Bi₂O₃: process optimization and stability analysis.J Photochem Photobiol A Chem2024;450:115470

[57] Wetchakun K,Sakulsermsuk S.An overview of solar/visible light-driven heterogeneous photocatalysis for water purification: TiO₂- and ZnO-based photocatalysts used in suspension photoreactors.J Ind Eng Chem2019;71:19-49

[58] Al-Tameemi HM,Abbar AH.Optimization of photocatalytic process with SnO₂ catalyst for COD reduction from petroleum refinery wastewater using a slurry bubble photoreactor.Case Stud Chem Environ Eng2024;9:100687

[59] Shokry F,Nosier S.Optimizing photocatalytic degradation of methyl violet dye in a recirculating slurry-type reactor.Results Chem2025;13:101980

[60] Ng KH,Cheng CK.Elimination of energy-consuming mechanical stirring: development of auto-suspending ZnO-based photocatalyst for organic wastewater treatment.J Hazard Mater2021;409:124532

[61] Zheng X,Shi L,Yuan D.Photocatalytic membrane reactors (PMRs) in water treatment: configurations and influencing factors.Catalysts2017;7:224

[62] Khader EH,Albayati TM.Current trends for wastewater treatment technologies with typical configurations of photocatalytic membrane reactor hybrid systems: a review.Chem Eng Process2023;192:109503

[63] Samuel O,Kamaludin R.Treatment of oily wastewater using photocatalytic membrane reactors: a critical review.J Environ Chem Eng2022;10:108539

[64] Espíndola JC,Mendes A,Vilar VJ.Photocatalytic membrane reactor performance towards oxytetracycline removal from synthetic and real matrices: suspended vs immobilized TiO₂-P25.Chem Eng J2019;378:122114

[65] Nguyen V,Nguyen XC.Submerged photocatalytic membrane reactor with suspended and immobilized N-doped TiO₂ under visible irradiation for diclofenac removal from wastewater.Process Saf Environ Prot2020;142:229-37

[66] Janssens R,Gillard J,Luis P.Performance of a slurry photocatalytic membrane reactor for the treatment of real secondary wastewater effluent polluted by anticancer drugs.Ind Eng Chem Res2021;60:2223-31

[67] Amadelli R.Photoelectrocatalysis for water purification. In: Pichat P, editor. Photocatalysis and water purification. Wiley; 2013. pp. 241-70.

[68] Marinho BA,Likozar B,Marinko Ž.Photocatalytic, electrocatalytic and photoelectrocatalytic degradation of pharmaceuticals in aqueous media: analytical methods, mechanisms, simulations, catalysts and reactors.J Clean Prod2022;343:131061

[69] Suhadolnik L,Novak U,Mihelič A.Continuous photocatalytic, electrocatalytic and photo-electrocatalytic degradation of a reactive textile dye for wastewater-treatment processes: batch, microreactor and scaled-up operation.J Ind Eng Chem2019;72:178-88

[70] Meng H,Liu P.Development of a three-dimensional photoelectrocatalytic reactor packed with granular sludge carbon photoelectrocatalyst for efficient wastewater treatment.Sep Purif Technol2021;277:119642

[71] Boschetti M,Mangherini G.Modular stand-alone photoelectrocatalytic reactor for emergent contaminant degradation via solar radiation.Solar Energy2021;228:120-7

[72] Sathya K,Carlin Geor Malar G,Raja Lakshmi P.A comprehensive review on comparison among effluent treatment methods and modern methods of treatment of industrial wastewater effluent from different sources.Appl Water Sci2022;12:70 PMCID:PMC8935115

[73] Sacco O,Sannino D.Main parameters influencing the design of photocatalytic reactors for wastewater treatment: a mini review.J Chem Technol Biotechnol2020;95:2608-18

[74] Vaiano V,Pisano D,Ciambelli P.From the design to the development of a continuous fixed bed photoreactor for photocatalytic degradation of organic pollutants in wastewater.Chem Eng Sci2015;137:152-60

[75] Enesca A.The influence of photocatalytic reactors design and operating parameters on the wastewater organic pollutants removal - a mini-review.Catalysts2021;11:556

[76] Shaghaghi M,Bazargan A.Photocatalytic reactor types and configurations. In: Bazargan A, editor. Photocatalytic water and wastewater treatment. IWA Publishing; 2022. pp. 73-110.

[77] Hakki HK.Comprehensive analysis of photocatalytic and photoreactor challenges in photocatalytic wastewater treatment: a case study with ZnO photocatalyst.Mater Sci Semicond Process2024;181:108592

[78] Asha RC,Remya N,Kumar M.Livestock wastewater treatment in batch and continuous photocatalytic systems: performance and economic analyses.Water Air Soil Pollut2015;226:2396

[79] Wang X,Wang Y.Combination of photocatalysis with hydrodynamic cavitation for degradation of tetracycline.Chem Eng J2017;315:274-82

[80] Alam MM,Uddin S.Photocatalytic degradation of reactive yellow in batch and continuous photoreactor using titanium dioxide.J Sci Res2012;4:665-74

[81] Balarak D.Photocatalytic degradation of amoxicillin using UV/synthesized NiO from pharmaceutical wastewater.Indones J Chem2019;19:211

[82] Krishnan T.Photocatalytic degradation of dyes by TiO₂ process in batch photoreactor.Lett Appl NanoBioSci2020;9:1502-12

[83] Colombo E.Comparison of the photocatalytic efficiencies of continuous stirred tank reactor (CSTR) and batch systems using a dispersed micron sized photocatalyst.RSC Adv2017;7:48222-9

[84] Yang H,Park SJ.Exploring the viability of a floating photocatalyst in a continuous stirred tank reactor system for continuous water treatment.Environ Sci Pollut Res Int2023;30:114582-90

[85] Tang C.The photocatalytic degradation of reactive black 5 using TiO₂/UV in an annular photoreactor.Water Res2004;38:2775-81

[86] Ma X,Yang Y.Full-scale integrated skid-mounted plug flow photocatalytic reactor: treatment of hospital wastewater.J Environ Chem Eng2024;12:111596

[87] Adishkumar S,Rajesh Banu J.Evaluation of bench-scale solar photocatalytic reactors for degradation of phenolic wastewaters.Desalination Water Treat2016;57:16862-70

[88] Pedina S.Hydrodynamics of a three-phase annular fluidized bed photocatalytic reactor (TAFBPR) with TiO₂/CSGAC-experimental and statistical analysis.Powder Technol2024;445:120124

[89] Kumar Jaiswal, V.; Dutta Gupta, A.; Verma, V.; Sharan Singh, R. Degradation of p-cresol in the presence of UV light driven in an integrated system containing photocatalytic and packed bed biofilm reactor.Bioresour Technol2023;387:129706

[90] Wang S,Wang J,Xu M.Photocatalytic degradation of rhodamine B over Z-scheme photocatalyst BiFeO₃/3DOM-TiO_2-x in a fixed-bed reactor.Mater Sci Semicond Process2024;173:108108

[91] Alalm MG,Meroni D,Bianchi CL.Toward scaling-up photocatalytic process for multiphase environmental applications.Catalysts2021;11:562

[92] Kahveci O,Sarıkaya EK.Construction of unary and ternary ZnO–CuO–CdO composite thin films and comprehensive analysis of their optical, electrical, and photocatalytic performance.J Alloys Compd2024;997:174827

[93] Molinari R,Lavorato C.Which configuration of photocatalytic membrane reactors has a major potential to be used at an industrial level in tertiary sewage wastewater treatment?.Catalysts2023;13:1204

[94] Janssens R,Dubey KK.Slurry photocatalytic membrane reactor technology for removal of pharmaceutical compounds from wastewater: towards cytostatic drug elimination.Sci Total Environ2017;599-600:612-26

[95] Rani CN,Prince Arockia Doss S.Photocatalytic ultrafiltration membrane reactors in water and wastewater treatment - a review.Chem Eng Process2021;165:108445

[96] Golshenas A,Ashrafizadeh SN.Performance evaluation of a ceramic-based photocatalytic membrane reactor for treatment of oily wastewater.J Water Process Eng2020;36:101186

[97] Deepracha S,Ayral A.Simple and efficient method for functionalizing photocatalytic ceramic membranes and assessment of its applicability for wastewater treatment in up-scalable membrane reactors.Sep Purif Technol2021;262:118307

[98] Gomaa HG,Zhu J.Treatment of oily wastewater using submerged photocatalytic membrane reactor.Particuology2024;94:252-60

[99] Kubiak A.Developing a novel continuous-flow cascade photocatalytic system for effective sulfamethoxazole elimination from hospital wastewater.Chem Eng J2024;495:153518

[100] Zeghioud H,Coulibaly LS,Assadi AA.Photocatalytic degradation of binary and ternary mixtures of antibiotics: reactive species investigation in pilot scale.Chem Eng Res Des2019;144:300-9

[101] Buehler D,Frei M.Towards water and energy self-sufficiency: a closed-loop, solar-driven, low-tech laundry pilot facility (LaundReCycle) for the reuse of laundry wastewater.Circ Econ Sust2021;1:1037-51

[102] Kayahan E,Braeken L.Dawn of a new era in industrial photochemistry: the scale-up of micro- and mesostructured photoreactors.Beilstein J Org Chem2020;16:2484-504 PMCID:PMC7554662

[103] Hakke V,Anandan S,Ashokkumar M.Process intensification approach using microreactors for synthesizing nanomaterials - a critical review.Nanomaterials2021;11:98 PMCID:PMC7823899

[104] Abiev RS.Miniaturization as one of the paths to process intensification in chemical engineering.Theor Found Chem Eng2020;54:1-2

[105] Shukla K,Duraiswamy S.Recent advances in heterogeneous micro-photoreactors for wastewater treatment application.Chem Eng Sci2021;235:116511

[106] Peralta Muniz Moreira, R.; Li Puma, G. CFD modeling of pharmaceuticals and CECs removal by UV/H₂O₂ process in helical microcapillary photoreactors and evaluation of OH radical rate constants.Chem Eng J2021;415:128833

[107] Kazemi Hakki, H.; Allahyari, S. Intensification of photocatalytic wastewater treatment using a novel continuous microcapillary photoreactor irradiated by visible LED lights.Chem Eng Process2022;175:108937

[108] Russo D,Vaccaro M.Direct photolysis of benzoylecgonine under UV irradiation at 254 nm in a continuous flow microcapillary array photoreactor.Chem Eng J2016;283:243-50

[109] Yusuf A,Yildiz Ozer L.Modelling of a recirculating photocatalytic microreactor implementing mesoporous N-TiO₂ modified with graphene.Chem Eng J2020;391:123574

[110] Jia L,Li J,Chen M.Study on high-efficiency photocatalytic degradation of oxytetracycline based on a spiral microchannel reactor.Ind Eng Chem Res2022;61:554-65

[111] Zelić IE,Gomzi Z.Development of a new rotating photocatalytic reactor for the degradation of hazardous pollutants.Int J Chem React Eng2023;21:823-33

[112] Fallahizadeh S,Rahimi MR.The spinning disc reactor for photocatalytic degradation: a systematic review.Heliyon2024;10:e32440 PMCID:PMC11219348

[113] Fallahizadeh S,Gholami M,Farzadkia M.Novel nanostructure approach for antibiotic decomposition in a spinning disc photocatalytic reactor.Sci Rep2024;14:10566 PMCID:PMC11079042

[114] Ghasemi AH,Zanganeh Ranjbar P.Enhanced photocatalytic degradation of methylene blue using a novel counter-rotating disc reactor.Front Chem2024;12:1335180 PMCID:PMC10920357

[115] Yossry A,Abdel-Aziz M,Sedahmed G.Intensification of the rate of diffusion-controlled reactions involved in wastewater treatment by using a rotating array of vertical cylinders reactor.J Environ Chem Eng2022;10:107330

[116] Borah P,Devi P.Chapter 2 - Types of inorganic pollutants: metals/metalloids, acids, and organic forms. In: Inorganic pollutants in water. Elsevier; 2020. pp. 17-31.

[117] Zaynab M,Ameen A.Health and environmental effects of heavy metals.J King Saud Univ Sci2022;34:101653

[118] Tytła M.Assessment of heavy metal pollution and potential ecological risk in sewage sludge from municipal wastewater treatment plant located in the most industrialized region in poland-case study.Int J Environ Res Public Health2019;16:2430 PMCID:PMC6651073

[119] Sable H,Singh V,Chahal S.Strategically engineering advanced nanomaterials for heavy-metal remediation from wastewater.Coord Chem Rev2024;518:216079

[120] Skliri E,Papadas IT,Armatas GS.Mesoporous composite networks of linked MnFe₂O₄ and ZnFe₂O₄ nanoparticles as efficient photocatalysts for the reduction of Cr(VI).Catalysts2021;11:199

[121] Li Y,Guo H.Synchronous removal of oxytetracycline and Cr(VI) in Fenton-like photocatalysis process driven by MnFe₂O₄/g-C₃N₄: performance and mechanisms.Chemosphere2024;352:141371

[122] Fatima T,Khanuja M.Superior photocatalytic and electrochemical activity of novel WS₂/PANI nanocomposite for the degradation and detection of pollutants: antibiotic, heavy metal ions, and dyes.Chem Eng J Adv2022;12:100373

[123] Qiu F,Tian Y.The construction of large-aperture Schottky heterostructures and the study of the reduction properties of heavy metal ions under natural light.Mater Design2025;250:113579

[124] Mohamed RM.Photocatalytic reduction and removal of mercury ions over mesoporous CuO/ZnO S-scheme heterojunction photocatalyst.Ceram Int2021;47:9659-67

[125] Abbasi H,Golmohammadi F.Removal of cadmium from aqueous solution by nano composites of bentonite/TiO₂ and bentonite/ZnO using photocatalysis adsorption process.Silicon2020;12:2721-31

[126] Sethy NK,Mishra PK.Green synthesis of TiO₂ nanoparticles from Syzygium cumini extract for photo-catalytic removal of lead (Pb) in explosive industrial wastewater.Green Process Synth2020;9:171-81

[127] Liu F,Tao L,Zhang J.Simultaneous photocatalytic redox removal of chromium(VI) and arsenic(III) by hydrothermal [e-mail] Sci Nano2019;6:937-47

[128] Le AT,Sreekantan S,Huynh DP.Mechanisms of removal of heavy metal ions by ZnO particles.Heliyon2019;5:e01440 PMCID:PMC6454208

[129] Al-Sherbini AA,El-Ghanam GMA,Youssef AM.Utilization of chitosan/Ag bionanocomposites as eco-friendly photocatalytic reactor for Bactericidal effect and heavy metals removal.Heliyon2019;5:e01980 PMCID:PMC6600004

[130] Zhang P,Wang Y,Huang J.Highly efficient uranium (VI) remove from aqueous solution using nano-TiO₂-anchored polymerized dopamine-wrapped magnetic photocatalyst.J Clean Prod2023;425:138796

[131] Dai Z,Sun Y,Ding D.ZnFe₂O₄/g-C₃N₄ S-scheme photocatalyst with enhanced adsorption and photocatalytic activity for uranium(VI) removal.Chem Eng J2021;415:129002

[132] Liang P,Deng H.Photocatalytic reduction of uranium(VI) by magnetic ZnFe₂O₄ under visible light.Appl Catal B Environ2020;267:118688

[133] Li Z,Dong Z.Synthesis of MoS₂/P-g-C₃N₄ nanocomposites with enhanced visible-light photocatalytic activity for the removal of uranium (VI).J Solid State Chem2021;302:122305

[134] Wang J,Wang W.Tunable mesoporous g-C₃N₄ nanosheets as a metal-free catalyst for enhanced visible-light-driven photocatalytic reduction of U(VI).Chem Eng J2020;383:123193

[135] Zhang X,Wang H,Chen Y.Enhanced synergistic removal of tetracycline and uranium in wastewater using Defective-Enriched S-scheme hollow dodecahedron K₃PW₁₂O₄₀@WS₂ heterojunction.Chem Eng J2024;495:153322

[136] Xu X,Cao M.Z-Scheme heterojunction Cu₂(OH)₃F/Bi₂WO₆ with improved photocatalytic activity for uranium removal from wastewater under air atmosphere.Sep Purif Technol2024;350:128012

[137] Ye H,Wu M.Tailor-Made Homo/Heterojunction engineering of CdS@Prussian blue via One-Pot kinetic regulation for photoreduction of uranium (VI) from radioactive wastewater.Chem Eng J2024;485:149731

[138] Lu S,Bao J.CdS@NiCr-LDH Z-scheme heterojunction with high adsorption–photocatalysis for uranium(VI) removal without any sacrificial agent.J Environ Chem Eng2024;12:112989

[139] Wu P,Zhao Y.Porphyrin-based hydrogen-bonded organic framework for visible light driven photocatalytic removal of U(VI) from real low-level radioactive wastewater.J Hazard Mater2023;459:132179

[140] Chen L,Kang J.The synthesis of a novel conjugated microporous polymer and application on photocatalytic removal of uranium(VI) from wastewater under visible light.Chem Eng J2022;431:133222

[141] Chakraborty AK,Ganguli S,Nur AS.Design of FeWO₄@N-TiO₂ nanocomposite and its enhanced photocatalytic activity in decomposing methylene blue and phenol under visible light.Environ Technol Innov2024;33:103536

[142] He Q,Song L.Refractory petrochemical wastewater treatment by K₂S₂O₈ assisted photocatalysis.Saudi J Biol Sci2019;26:849-53 PMCID:PMC6486611

[143] Alhajeri NS,Nasr M.Artificial intelligence-enabled optimization of Fe/Zn@biochar photocatalyst for 2,6-dichlorophenol removal from petrochemical wastewater: a techno-economic perspective.Chemosphere2024;352:141476

[144] Ramos-Huerta L,Piña-Pérez Y.Effect of calcination temperature on CeO₂-based catalysts with enhanced photocatalytic degradation of phenol under UV light.Mater Sci Semicond Process2025;187:109123

[145] Alanazi MQ,Alterary SS.Effect of potential microplastics in sewage effluent on Nile Tilapia and photocatalytic remediation with zinc oxide nanoparticles.Environ Pollut2023;332:121946

[146] Martín-González M,González-Díaz O,Doña-Rodríguez J.Open-cell ceramic foams covered with TiO₂ for the photocatalytic treatment of agro-industrial wastewaters containing imazalil at semi-pilot scale.J Taiwan Inst Chem Eng2023;147:104902

[147] Khasawneh OFS.Occurrence and removal of pharmaceuticals in wastewater treatment plants.Process Saf Environ Prot2021;150:532-56

[148] Cassini, A.; Högberg, L. D.; Plachouras, D.; et al; Burden of AMR Collaborative Group. Attributable deaths and disability-adjusted life-years caused by infections with antibiotic-resistant bacteria in the EU and the European Economic Area in 2015: a population-level modelling analysis. Lancet. Infect. Dis. 2019, 19, 56-66. PMCID:PMC6300481

[149] Konstas P,Konstantinou I.Photocatalytic treatment of pharmaceuticals in real hospital wastewaters for effluent quality amelioration.Water2019;11:2165

[150] Ariza-Tarazona MC,Barbieri V,Cedillo-González EI.New strategy for microplastic degradation: green photocatalysis using a protein-based porous N-TiO₂ semiconductor.Ceram Int2019;45:9618-24

[151] Jeyavani J,Govindarajan M,Vaseeharan B.A convenient strategy for mitigating microplastics in wastewater treatment using natural light and ZnO nanoparticles as photocatalysts: a mechanistic study.J Contam Hydrol2024;267:104436

[152] Sanchez JM,Gomez-Solis C.High removal of PS and PET microplastics from tap water by using Fe₂O₃ porous microparticles and photothermal irradiation with NIR light.Chemosphere2024;367:143538

[153] Chokejaroenrat C,T-Thienprasert J.Decomposition of microplastics using copper oxide/bismuth vanadate-based photocatalysts: insight mechanisms and environmental impacts.Mar Pollut Bull2024;201:116205

[154] Wu F,Chang F.Fabrication of a C₃N₄/Bi₁₂O₁₇Cl₂ heterojunction photocatalytic membrane applied for pharmaceutical and microplastic treatment.Sep Purif Technol2025;364:132394

[155] Gu M,Zhang Z.Multi-charge bridge transfer guiding design of photocatalyst with oxygen defects for effective degradation of PFAS in fluoropolymer production wastewater.Chem Eng J2025;505:159124

[156] Wen Y,Day GS.Integrated photocatalytic reduction and oxidation of perfluorooctanoic acid by metal-organic frameworks: key insights into the degradation mechanisms.J Am Chem Soc2022;144:11840-50

[157] Gates K,Pramanik A.Insight into the photocatalytic degradation mechanism for “Forever Chemicals” PFNA by reduced graphene oxide/WO₃ nanoflower heterostructures.ACS Omega2025;10:10675-84 PMCID:PMC11923664

[158] Devi AP,Madhual A,Behera AK.Plant biomass driven synthesis of gAu/RGO nanocomposite towards photocatalytic degradation of phenolic compounds in wastewater.J Environ Chem Eng2023;11:110161

[159] Abdelfattah I.Reduction of COD concentration and complete removal of phenol in industrial wastewater utilizing mesoporous TiO₂ nanoparticles under UVA illumination.Opt Mater2023;145:114410

[160] Mahboob I,Shafiq I.Mesoporous LaVO₄/MCM-48 nanocomposite with visible-light-driven photocatalytic degradation of phenol in wastewater.Environ Res2023;218:114983

[161] Safaralizadeh E,Janitabardarzi S.Visible light-induced degradation of phenolic contaminants utilizing nanoscale TiO₂ and ZnO impregnated with SR 7B (SR) dye as advanced photocatalytic systems.Ceram Int2025;51:1958-69

[162] Rashtizadeh A,Samadi A.Photodegradation of POPs-containing wastewater using sunlight driven Ce-doped-ZnO/g-C₃N₄ photocatalyst: optimization, and cost-efficiency analysis.Chem Phys Lett2023;811:140253

[163] Liang Y,Li S.Enhanced photocatalysis using metal-organic framework MIL-101(Fe) for crude oil degradation in oil-polluted water.J Fuel Chem Technol2024;52:607-18

[164] Brindhadevi K,Alharbi SA,Lee J.Enhanced photocatalytic degradation of polycyclic aromatic hydrocarbons (PAHs) using NiO nanoparticles.Environ Res2024;252:118454

[165] Amakiri KT,Chatzisymeon E.Photocatalytic degradation of phenol and polycyclic aromatic hydrocarbons in water by novel acid soluble collagen-polyvinylpyrrolidone polymer embedded in nitrogen-TiO₂.Chem Phys2025;589:112485

[166] Ghugal SG,Tadi KK.Optimized photocatalytic performance of ZnS-SnO₂ heterostructures for visible light driven mineralization of Acid violet 7 dye and inactivation of bacteria.Mater Sci Semicond Process2023;165:107657

[167] Muñoz-Flores P,Ania CO.Performance of a C-containing Cu-based photocatalyst for the degradation of tartrazine: comparison of performance in a slurry and CPC photoreactor under artificial and natural solar light.J Colloid Interface Sci2022;623:646-59

[168] Diego-Lopez A,Vidal-Moya A,Bosca F.Synthesis and mechanistic insights of SiO₂@WO₃@Fe₃O₄ as a novel supported photocatalyst for wastewater remediation under visible light.Appl Mater Today2023;33:101879

[169] Alzahrani FMA,Farooq A,Al-Buriahi M.A new BiOCl–ZnFe₂O₄/CNTs ternary composite for remarkable photocatalytic degradation studies of a herbicide and a diazo dye.Opt Mater2024;148:114876

[170] Fiorenza R,Cantarella M,Impellizzeri G.Selective photodegradation of 2,4-D pesticide from water by molecularly imprinted TiO₂.J Photochem Photobiol A Chem2019;380:111872

[171] Fenoll J,Flores P.Implementation of a new modular facility to detoxify agro-wastewater polluted with neonicotinoid insecticides in farms by solar photocatalysis.Energy2019;175:722-9

[172] Olatunde OC.A comparative study of the effect of graphene oxide, graphitic carbon nitride, and their composite on the photocatalytic activity of Cu₃SnS₄.Catalysts2022;12:14

[173] Vignati D,Libralato G.Photocatalytic ZnO-assisted degradation of spiramycin in urban wastewater: degradation kinetics and toxicity.Water2021;13:1051

[174] Xu Y,Liang C.Efficient adsorption and photocatalytic degradation of pharmaceutical compounds by Bi₂₄O₃₁Br₁₀: mechanism, toxicity assessment, and degradation pathways.J Water Process Eng2025;71:107233

[175] Antonopoulou M,Rapti I.Photocatalytic degradation of pharmaceutical amisulpride using g-C₃N₄ catalyst and UV-A irradiation.Catalysts2023;13:226

[176] Mohamed ZH,Hendawy HA.Enhanced photocatalytic degradation of the antidepressant sertraline in aqueous solutions by zinc oxide nanoparticles.Water2023;15:2074

[177] Evgenidou E,Koronaiou L,Anagnostopoulou K.Photocatalytic degradation of the antidepressant drug bupropion. Performance, water matrix effect and identification of transformation products.Sustain Chem Environ2023;3:100028

[178] Chatzimpaloglou A,Nika MC.Degradation of antineoplastic drug etoposide in aqueous environment by photolysis and photocatalysis. Identification of photocatalytic transformation products and toxicity assessment.Chem Eng J2022;431:133969

[179] Berbentea A,Duteanu N.Advanced photocatalytic degradation of cytarabine from pharmaceutical wastewaters.Toxics2024;12:405 PMCID:PMC11209206

[180] Swedha M,Okla MK.Graphitic carbon nitride embedded Ni₃(VO₄)₂/ZnCr₂O₄ Z-scheme photocatalyst for efficient degradation of p-chlorophenol and 5-fluorouracil, and genotoxic evaluation in Allium cepa.J Ind Eng Chem2022;112:244-57

[181] Yasir M,Masar M.Design and fabrication of TiO₂/Nd polyurethane nanofibers based photoreactor: a continuous flow kinetics study for Estriol degradation and mechanism.J Water Process Eng2023;56:104271

[182] Ali H,Ngwabebhoh FA.Boosting photocatalytic degradation of estrone hormone by silica-supported g-C₃N₄/WO₃ using response surface methodology coupled with Box-Behnken design.J Photochem Photobiol A Chem2023;441:114733

[183] Ruta V,Bonetti L,Vilé G.Structural effects of metal single-atom catalysts for enhanced photocatalytic degradation of gemfibrozil.ACS Appl Nano Mater2022;5:14520-8 PMCID:PMC9623544

[184] Mar-Ortiz AF,Sánchez-Polo M,Cerino-Córdova FJ.Photodegradation of antihistamine chlorpheniramine using a novel iron-incorporated carbon material and solar radiation.Environ Sci Water Res Technol2020;6:2607-18

[185] Sehrawat P,Singh S,Bhinder SS.Solar-driven S-scheme Zn_0.5Cd_0.5S/MoS₂ composite for photocatalytic ketorolac tromethamine degradation and hydrogen generation coupled with benzyl alcohol oxidation.Int J Hydrogen Energy2024;62:17-30

[186] Alomar MS,Zouli N.Solar-driven purification: removing pharmaceutical contaminants from water using carbon-doped NASICON photocatalyst.Mater Sci Semicond Process2025;185:108901

[187] Galaburda M,Osipiuk K.Enhanced photocatalytic degradation of antiviral drugs lopinavir and ritonavir by Ni doped ZnO/SiO₂ nanocomposites.J Environ Chem Eng2024;12:114525

[188] Hojamberdiev M,Wasilewska A.Detoxifying SARS-CoV-2 antiviral drugs from model and real wastewaters by industrial waste-derived multiphase photocatalysts.J Hazard Mater2022;429:128300 PMCID:PMC8767938

[189] Kowalczyk A,Osipiuk K.The visible-light-driven activity of biochar-doped TiO₂ photocatalysts in β-blockers removal from water.Materials2023;16:1094 PMCID:PMC9919264

[190] Sarabyar S,Tahmasebi HA,Khosroyar S.Enhancing photocatalytic degradation of beta-blocker drugs using TiO₂ NPs/zeolite and ZnO NPs/zeolite as photocatalysts: optimization and kinetic investigations.Sci Rep2024;14:27390 PMCID:PMC11550835

[191] Luo Y,Liu Y.Disinfection by-products formation and acute toxicity variation of hospital wastewater under different disinfection processes.Sep Purif Technol2020;238:116405

[192] Majumder A,Ghosal PS.A review on hospital wastewater treatment: a special emphasis on occurrence and removal of pharmaceutically active compounds, resistant microorganisms, and SARS-CoV-2.J Environ Chem Eng2021;9:104812 PMCID:PMC7680650

[193] Zhang G,Chen S,Chen J.Problems of conventional disinfection and new sterilization methods for antibiotic resistance control.Chemosphere2020;254:126831

[194] Zhan J,Zhu Y.Potential pathogenic microorganisms in rural wastewater treatment process: succession characteristics, concentration variation, source exploration, and risk assessment.Water Res2024;254:121359

[195] Chen P,Zhang J.Photocatalysis enhanced constructed wetlands effectively remove antibiotic resistance genes from domestic wastewater.Chemosphere2023;325:138330

[196] Saravanan A,Jeevanantham S,Kiruthika A.Photocatalytic disinfection of micro-organisms: mechanisms and applications.Environ Technol Innov2021;24:101909

[197] Baaloudj O,Nasrallah N,Khezami L.Simultaneous removal of antibiotics and inactivation of antibiotic-resistant bacteria by photocatalysis: a review.J Water Process Eng2021;42:102089

[198] Channa N,Mahar RB,Bonelli B.Combined photocatalytic degradation of pollutants and inactivation of waterborne pathogens using solar light active α/β-Bi₂O₃.Colloids Surf A2021;615:126214

[199] Jaffari ZH,Sin J,Mohamed AR.Magnetically recoverable Pd-loaded BiFeO₃ microcomposite with enhanced visible light photocatalytic performance for pollutant, bacterial and fungal elimination.Sep Purif Technol2020;236:116195

[200] Achouri F,Wahab MA.Effect of photocatalysis (TiO₂/UV_A) on the inactivation and inhibition of Pseudomonas aeruginosa virulence factors expression.Environ Technol2021;42:4237-46

[201] Krishnan S,Din MFBM,Nasrullah M.Photocatalytic degradation of methylene blue dye and fungi Fusarium equiseti using titanium dioxide recovered from drinking water treatment sludge.Biomass Conv Bioref2023;13:10853-63

[202] Abeledo-Lameiro MJ,Ares-Mazás E.Inactivation of the waterborne pathogen Cryptosporidium parvum by photo-Fenton process under natural solar conditions.Appl Catal B Environ2019;253:341-7

[203] Leonel LP.Action of chlorine, peracetic acid, UV-LED radiation, and advanced oxidation process on Giardia lamblia cysts for reclaimed water production.Int J Environ Sci Technol2025;22:7783-96

[204] Baudys M,Hodek J.Inactivation of influenza virus as representative of enveloped RNA viruses on photocatalytically active nanoparticle and nanotubular TiO₂ surfaces.Catal Today2024;430:114511

[205] Zhang C,Li Y,Zhou X.Continuous inactivation of human adenoviruses in water by a novel g-C₃N₄/WO₃/biochar memory photocatalyst under light-dark cycles.J Hazard Mater2023;442:130013

[206] Zhang L,Zhu D.Adsorption-enhanced photocatalytic waterborne virus inactivation by graphite carbon nitride conjugated with covalent organic frameworks.Chem Eng J2023;472:144893

[207] Xie Y,Zhao Y,Liu C.Effect of dissolved organic matter on the inactivation of bacteriophage MS₂ by graphitic carbon nitride - based photocatalysis.J Environ Chem Eng2024;12:112025

[208] Lee J,Kim S.Enhanced virucidal activity of facet-engineered Cu-doped TiO₂ nanorods under visible light illumination.Water Res2025;268:122579

[209] Cheng R,Shen ZP,Zheng X.Visible-light-driven photocatalytic inactivation of bacteriophage f2 by Cu-TiO₂ nanofibers in the presence of humic acid.J Environ Sci 219;77:383-91

[210] Jacob MF,Alfano OM,Briggiler Marcó M.Photocatalytic paint for phage inactivation in dairy industry: inactivation constants and efficiencies.J Environ Chem Eng2023;11:110617

[211] Lin Z,Xu Y.Construction of a novel efficient Z-scheme BiVO₄/EAQ heterojunction for the photocatalytic inactivation of antibiotic-resistant pathogens: performance and mechanism.Chem Eng J2023;453:139747

[212] Yang J,Zhu X.Copper-doped bismuth oxychloride nanosheets assembled into sphere-like morphology for improved photocatalytic inactivation of drug-resistant bacteria.Sci Total Environ2024;912:168916

[213] Zhong J,Carvalho G.Simultaneous removal of micropollutants, antibiotic resistant bacteria, and antibiotic resistance genes using graphitic carbon nitride under simulated solar irradiation.Chem Eng J2022;433:133839

[214] Zhou Z,Cheng Z.Mechanistic insights for efficient inactivation of antibiotic resistance genes: a synergistic interfacial adsorption and photocatalytic-oxidation process.Sci Bull2020;65:2107-19

[215] Ye S,Huang L.MWCNT/BiVO₄ photocatalyst for inactivation performance and mechanism of Shigella flexneri HL, antibiotic-resistant pathogen.Chem Eng J2021;424:130415

[216] Osman AI,Eltaweil AS.Biofuel production, hydrogen production and water remediation by photocatalysis, biocatalysis and electrocatalysis.Environ Chem Lett2023;21:1315-79

[217] Zeng Q,Peng D.Research progress in photocatalytic-coupled microbial electrochemical technology in wastewater treatment.Catalysts2025;15:81

[218] Xiao J,Rabeah J,Cao H.Visible-light photocatalytic ozonation using graphitic C₃N₄ catalysts: a hydroxyl radical manufacturer for wastewater treatment.Acc Chem Res2020;53:1024-33

[219] Rodríguez EM,Mena E.Application of solar photocatalytic ozonation in water treatment using supported TiO₂.Appl Catal B Environ2019;254:237-45

[220] Jiad MM.Petroleum refinery wastewater treatment using a novel combined electro-Fenton and photocatalytic process.J Ind Eng Chem2024;129:634-55

[221] Xu P,Zheng D.Simultaneous electricity generation and wastewater treatment in a photocatalytic fuel cell integrating electro-Fenton process.J Power Sources2019;421:156-61

[222] Serrà A,Michler J.Facile cost-effective fabrication of Cu@Cu₂O@CuO–microalgae photocatalyst with enhanced visible light degradation of tetracycline.Chem Eng J2021;413:127477

[223] Li C,Zhang Y.Sequential combination of photocatalysis and microalgae technology for promoting the degradation and detoxification of typical antibiotics.Water Res2022;210:117985

[224] Lu Z,Peng L,Liu Y.A two-stage degradation coupling photocatalysis to microalgae enhances the mineralization of enrofloxacin.Chemosphere2022;293:133523

[225] de Sousa, C. M.; Cardoso, V. L.; Batista, F. R. X. A coupled photocatalytic system using niobium oxide and microalga: Cr (VI)-contaminated wastewater treatment.J Photochem Photobiol A Chem2023;439:114602

[226] Wang G.Application of photocatalysis and sonocatalysis for treatment of organic dye wastewater and the synergistic effect of ultrasound and light.Molecules2023;28:3706 PMCID:PMC10180204

[227] Schieppati D,Peyot ML,Bianchi CL.An ultrasound-assisted photocatalytic treatment to remove an herbicidal pollutant from wastewaters.Ultrason Sonochem2019;54:302-10

[228] Karim AV.Degradation of ciprofloxacin using photo, sono, and sonophotocatalytic oxidation with visible light and low-frequency ultrasound: degradation kinetics and pathways.Chem Eng J2020;392:124853

[229] Khalegh R.Optimization of the effect of nanoparticle morphologies on the cost of dye wastewater treatment via ultrasonic/photocatalytic hybrid process.Appl Nanosci2019;9:1869-89

[230] Chen P,Zhang J.New and traditional methods for antibiotic resistance genes removal: constructed wetland technology and photocatalysis technology.Front Microbiol2022;13:1110793 PMCID:PMC9845729

[231] Nguyen HTT,Chen K.Treatment of organic matter and tetracycline in water by using constructed wetlands and photocatalysis.Appl Sci2019;9:2680

[232] Başaran Dindaş, G.; Çalışkan, Y.; Çelebi, E. E.; Tekbaş, M.; Bektaş, N.; Yatmaz, H. C. Treatment of pharmaceutical wastewater by combination of electrocoagulation, electro-fenton and photocatalytic oxidation processes.J Environ Chem Eng2020;8:103777

[233] Aldana JC,Álvarez PM.Membrane filtration, activated sludge and solar photocatalytic technologies for the effective treatment of table olive processing wastewater.J Environ Chem Eng2021;9:105743

[234] Kusworo TD,Jos B.Photocatalytic nanohybrid UV-light-driven PVDF/GO-NiFe@SiO₂ membrane coupled with bentonite adsorption and ozonation process for a sustainable textile wastewater treatment.Process Saf Environ Prot2024;190:438-57

[235] Majumder A,Röher D.Combination of advanced biological systems and photocatalysis for the treatment of real hospital wastewater spiked with carbamazepine: a pilot-scale study.J Environ Manage2024;351:119672