Photoreduction adjusted surface oxygen vacancy of Bi₂MoO₆ for boosting photocatalytic redox performance

Abstract

In this study, Bi₂MoO₆ with adjustable rich oxygen vacancies was prepared by a novel and simple solvothermal-photoreduction method which might be suitable for a large-scale production. The experiment results show that Bi₂MoO₆ with rich oxygen vacancies is an excellent photocatalyst. The photocatalytic ability of BMO-10 is 0.3 and 3.5 times higher than that of the pristine Bi₂MoO₆ for Rhodamine B degradation and Cr(VI) reduction, respectively. The results display that the band energy of the samples with oxygen vacancies was narrowed and the light absorption was broadened. Meanwhile, the efficiency of photogenerated electron-holes was increased and the separation and transfer speed of photogenerated carriers were improved. Therefore, this work provides a convenient and efficient method to prepare potential adjustable oxygen vacancy based photocatalysts to eliminate the pollution of dyes and Cr(VI) in water.

Key words： Bi₂MoO₆; oxygen vacancies; photoreduction; Cr(VI); RhB

Competing interests

The authors declare that they have no competing interests.

Acknowledgements

This work was partly supported by the National Natural Science Foundation of China (Grant No. 21978276), Natural Science Foundation of Liaoning Province (No. 2021-MS-260) and Scientific Research Funding Project of the Educational Department of Liaoning Province in 2020 (No. LZ2020002). Yu Liang sincerely expresses her gratitude to the CSC scholarship.

References

1 Su T, Shao Q, Qin Z, Guo Z, Wu Z. Role of interfaces in two-dimensional photocatalyst for water splitting. ACS Catalysis, 2018, 8(3): 2253–2276

2 Stoller M, Pulido J, Vilardi G, Vuppala S, Bravi M, Verdone N, Pailma L. Technical and economic impact of photocatalysis as a pretreatment process step in olive mill wastewater treatment by membranes. Chemical Engineering Transactions, 2017, 57: 1171–1176

3 Wang W, Song L L, Zhang H L, Zhang G H, Cao J L. Graphene-like h-BN supported polyhedral NiS₂/NiS nanocrystals with excellent photocatalytic performance for removing rhodamine B and Cr(VI). Frontiers of Chemical Science and Engineering, 2021, 15(6): 1537–1549

4 Liang Y, Li W, Bei B, Li C, He Z, Wang X, Zhou R, Ding H, Li S. Composites of TiO₂ pillared sericite: synthesis, characterization and photocatalytic degradation of methyl orange. Applied Clay Science, 2023, 242: 107044

5 Liang Y, Li W, Wang X, Zhou R, Ding H. TiO₂-ZnO/Au ternary heterojunction nanocomposite: excellent antibacterial property and visible-light photocatalytic hydrogen production efficiency. Ceramics International, 2022, 48(2): 2826–2832

6 Liang Y, Chen S, Zhong J, Ding H, Zhu Z, Li S. Acid-etched coal fly ash/TiO₂ nanocomposites with high photocatalytic degradation efficiency: a high value-added application of coal fly ash. Journal of Sol-Gel Science and Technology, 2022, 103(1): 185–194

7 Liang Y, Liu W, Ding H, Zhang H, Li W. Rutile-perovskite multi-phase composite by mechano-chemical method together with calcination: preparation and application in coatings and ceramic glaze. Ceramics International, 2021, 47(2): 2261–2269

8 Kuriki R, Matsunaga H, Nakashima T, Wada K, Yamakata A, Ishitani O, Maeda K. Nature-inspired, highly durable CO₂ reduction system consisting of a binuclear ruthenium(II) complex and an organic semiconductor using visible light. Journal of the American Chemical Society, 2016, 138(15): 5159–5170

9 Liang L, Li X, Sun Y, Tan Y, Jiao X, Ju H, Qi Z, Zhu J, Xie Y. Infrared light-driven CO₂ overall splitting at room temperature. Joule, 2018, 2(5): 1004–1016

10 Zhan W, Nie Y, Wu Z, Li J, Ding Y, Ma C, Chen D. Novel rare earth ions doped Bi₂WO₆/rGO hybrids assisted by ionic liquid with enhanced photocatalytic activity under natural sunlight. Journal of Sol-Gel Science and Technology, 2021, 98(1): 84–94

11 Han C, Li J, Ma Z, Xie H, Waterhouse G, Ye L, Zhang T. Black phosphorus quantum dot/g-C₃N₄ composites for enhanced CO₂ photoreduction to CO. Science China Materials, 2018, 61(9): 1159–1166

12 Basavarajappa P, Patil S, Ganganagappa N, Reddy K, Raghu A, Reddy C. Recent progress in metal-doped TiO₂, non-metal doped/codoped TiO₂ and TiO₂ nanostructured hybrids for enhanced photocatalysis. International Journal of Hydrogen Energy, 2020, 45(13): 7764–7778

13 Dai Z, Qin F, Zhao H, Ding J, Liu Y, Chen R. Crystal defect engineering of aurivillius Bi₂MoO₆ by Ce doping for increased reactive species production in photocatalysis. ACS Catalysis, 2016, 6(5): 3180–3192

14 Liu Z, Li X, Su S, Ding W, Meng L, Wang Y, Tan M, Luo M. Enhancing photocatalytic nitrogen fixation performance of Co-doped bismuth molybdate through band engineering tuning. Applied Surface Science, 2023, 611: 155627

15 Su Q, Li J, Wang B, Li Y, Hou L. Direct Z-scheme Bi₂MoO₆/UiO-66-NH₂ heterojunctions for enhanced photocatalytic degradation of ofloxacin and ciprofloxacin under visible light. Applied Catalysis B: Environmental, 2022, 318: 121820

16 Kong X, Choo Y, Chai S, Soh A, Mohamed A. Oxygen vacancy induced Bi₂WO₆ for the realization of photocatalytic CO₂ reduction over the full solar spectrum: from the UV to the NIR region. Chemical Communications, 2016, 52(99): 14242–14245

17 Fu F, Shen H, Sun X, Xue W, Shoneye A, Ma J, Luo L, Wang D, Wang J, Tang J. Synergistic effect of surface oxygen vacancies and interfacial charge transfer on Fe(III)/Bi₂MoO₆ for efficient photocatalysis. Applied Catalysis B: Environmental, 2019, 247: 150–162

18 Liu Z, Tai Y, Liu J, Liu F, Han B, Fu W, Yang X, Xie H, Liu Q. A novel mechanism for visible-light degradation of phenol by oxygen vacancy Bi₂MoO₆ homojunction. Applied Surface Science, 2022, 605: 154671

19 Di J, Xia J, Ji M, Li H, Xu H, Li H, Chen R. The synergistic role of carbon quantum dots for the improved photocatalytic performance of Bi₂MoO₆. Nanoscale, 2015, 7(26): 11433–11443

20 Zhang M, Shao C, Mu J, Zhang Z, Guo Z, Zhang P, Liu Y. One-dimensional Bi₂MoO₆/TiO₂ hierarchical heterostructures with enhanced photocatalytic activity. CrystEngComm, 2012, 14(2): 605–612

21 Di J, Zhao X, Lian C, Ji M, Xia J, Xiong J, Zhou W, Cao X, She Y, Liu H. . Atomically-thin Bi₂MoO₆ nanosheets with vacancy pairs for improved photocatalytic CO₂ reduction. Nano Energy, 2019, 61: 54–59

22 Li H, Liu J, Hou W, Du N, Zhang R, Tao X. Synthesis and characterization of g-C₃N₄/Bi₂MoO₆ heterojunctions with enhanced visible light photocatalytic activity. Applied Catalysis B: Environmental, 2014, 160: 89–97

23 Yu W, Chen J, Shang T, Chen L, Gu L, Peng T. Direct Z-scheme g-C₃N₄/WO₃ photocatalyst with atomically defined junction for H₂ production. Applied Catalysis B: Environmental, 2017, 219: 693–704

24 Xu Q, Cheng B, Yu J, Liu G. Making co-condensed amorphous carbon/g-C₃N₄ composites with improved visible-light photocatalytic H₂-production performance using Pt as cocatalyst. Carbon, 2017, 118: 241–249

25 Zheng Y, Zhou T, Zhao X, Pang W, Gao H, Li S, Zhou Z, Liu H, Guo Z. Atomic interface engineering and electric-field effect in ultrathin Bi₂MoO₆ nanosheets for superior lithium ion storage. Advanced Materials, 2017, 29(26): 1700396

26 Kongmark C, Coulter R, Cristol S, Rubbens A, Pirovano C, Loefberg A, Sankar G, van Beek W, Bordes E, Vannier R. A comprehensive scenario of the crystal growth of gamma-Bi₂MoO₆ catalyst during hydrothermal synthesis. Crystal Growth & Design, 2012, 12(12): 5994–6003

27 Wei Z, Liu Y, Wang J, Zong R, Yao W, Wang J, Zhu Y. Controlled synthesis of a highly dispersed BiPO₄ photocatalyst with surface oxygen vacancies. Nanoscale, 2015, 7(33): 13943–13950

28 Wang S, Ding X, Yang N, Zhan G, Zhang X, Dong G, Zhang L, Chen H. Insight into the effect of bromine on facet-dependent surface oxygen vacancies construction and stabilization of Bi₂MoO₆ for efficient photocatalytic NO removal. Applied Catalysis B: Environmental, 2020, 265: 118585

29 Yu J, Zhang J, Jaroniec M. Preparation and enhanced visible-light photocatalytic H₂-production activity of CdS quantum dots-sensitized Zn_1−xCd_xS solid solution. Green Chemistry, 2010, 12(9): 1611–1614

30 Miao Z, Wang Q, Zhang Y, Meng L, Wang X. In situ construction of S-scheme AgBr/BiOBr heterojunction with surface oxygen vacancy for boosting photocatalytic CO₂ reduction with H₂O. Applied Catalysis B: Environmental, 2022, 301: 120802

31 Li B, Shao L, Wang R, Dong X, Zhao F, Gao P, Li Z. Interfacial synergism of Pd-decorated BiOCl ultrathin nanosheets for the selective oxidation of aromatic alcohols. Journal of Materials Chemistry A, 2018, 6(15): 6344–6355

32 Wang J, Xue C, Yao W, Liu J, Gao X, Zong R, Yang Z, Jin W, Tao D. MOF-derived hollow TiO₂@C/FeTiO₃ nanoparticles as photoanodes with enhanced full spectrum light PEC activities. Applied Catalysis B: Environmental, 2019, 250: 369–381

33 Jing K, Ma W, Ren Y, Xiong J, Guo B, Song Y, Liang S, Wu L. Hierarchical Bi₂MoO₆ spheres in situ assembled by monolayer nanosheets toward photocatalytic selective oxidation of benzyl alcohol. Applied Catalysis B: Environmental, 2019, 243: 10–18

34 Xia Y, Jia Y, Qian W, Xu X, Wu Z, Han Z, Hong Y, You H, Ismail M, Bai G. . Pyroelectrically induced pyro-electro-chemical catalytic activity of BaTiO₃ nanofibers under room-temperature cold-hot cycle excitations. Metals, 2017, 7(4): 122