Synthesis, characterization, antibacterial and photocatalytic performance of Ag/AgI/TiO₂ hollow sphere composites

Abstract

Dispersed TiO₂ hollow spheres were successfully prepared which was obtained via Ostwald ripening under solvothermal conditions without any templates or surfactants. Then, the AgI/TiO₂ was synthesized by the deposition−precipitation process. Finally, Ag/AgI/TiO₂ was obtained by a photocatalytic reduction way. Their characteristics were analyzed by XRD, SEM, HRTEM, N₂ adsorption−desorption measurements and UV-vis absorption spectra. To demonstrate the potential applications of such composites, their antibacterial activity against Escherichia coli (E. coli) was studied by microcalorimetry for the first time, and their photocatalytic performance for degradation of different organic dyes under simulated UV and visible light was discussed. The results indicated that Ag/AgI/TiO₂ hollow spheres revealed elevated antibacterial and photocatalytic activity because of their unique morphology, hollow structure and high surface area. The mechanism of the excellent antibacterial and photocatalytic activity of Ag/AgI/TiO₂ hollow spheres are discussed which are attributed to the synergetic effect of Ag, AgI and TiO₂. It suggested that the new Ag/AgI/TiO₂ photocatalyst has broad application prospects in solar cell, sensor, antibacterial, catalysis and nanotechnology.

Keywords

Ag/AgI/TiO ₂ / hollow sphere / Ostwald ripening / microcalorimetric method / antibacterial and photocatalytic performance

References

[1] Zhao S, Chen J, Liu Y, . Silver nanoparticles confined in shell-in-shell hollow TiO₂ manifesting efficiently photocatalytic activity and stability. Chemical Engineering Journal, 2019, 367: 249–259

[2] Pal S, Laera A M, Licciulli A, . Biphase TiO₂ microspheres with enhanced photocatalytic activity. Industrial & Engineering Chemistry Research, 2014, 53(19): 7931–7938

[3] Hoffmann M R, Martin S T, Choi W, . Environmental applications of semiconductor photocatalysis. Chemical Reviews, 1995, 95(1): 69–96

[4] Zhang J, Xu Q, Feng Z, . Importance of the relationship between surface phases and photocatalytic activity of TiO_2. Angewandte Chemie International Edition, 2008, 47(9): 1766–1769

[5] Zhang Y, Chen J, Tang H, . Hierarchically-structured SiO₂‒Ag@TiO₂ hollow spheres with excellent photocatalytic activity and recyclability. Journal of Hazardous Materials, 2018, 354: 17–26

[6] Shankar K, Basham J I, Allam N K, . Recent advances in the use of TiO₂ nanotube and nanowire arrays for oxidative photoelectrochemistry. The Journal of Physical Chemistry C, 2009, 113(16): 6327–6359

[7] Liu S, Yu J, Jaroniec M. Tunable photocatalytic selectivity of hollow TiO₂ microspheres composed of anatase polyhedra with exposed {001} facets. Journal of the American Chemical Society, 2010, 132(34): 11914–11916

[8] Fang W Q, Zhou J Z, Liu J, . Hierarchical structures of single-crystalline anatase TiO₂ nanosheets dominated by {001} facets. Chemistry: A European Journal, 2011, 17(5): 1423–1427

[9] Yang H G, Sun C H, Qiao S Z, . Anatase TiO₂ single crystals with a large percentage of reactive facets. Nature, 2008, 453(7195): 638–641

[10] Sakthivel S, Kisch H. Daylight photocatalysis by carbon-modified titanium dioxide. Angewandte Chemie International Edition, 2003, 42(40): 4908–4911

[11] Zhao W, Ma W, Chen C, . Efficient degradation of toxic organic pollutants with Ni₂O₃/TiO_2−xB_x under visible irradiation. Journal of the American Chemical Society, 2004, 126(15): 4782–4783

[12] Arabatzis I M, Stergiopoulos T, Bernard M C, . Silver-modified titanium dioxide thin films for efficient photodegradation of methyl orange. Applied Catalysis B: Environmental, 2003, 42(2): 187–201

[13] Zhang H, Wang G, Chen D, . Tuning photoelectrochemical performances of Ag‒TiO₂ nanocomposites via reduction/oxidation of Ag. Chemistry of Materials, 2008, 20(20): 6543–6549

[14] Jing Z, Wang C, Wang G, . Preparation and antibacterial activities of undoped and palladium doped titania nanoparticles. Journal of Sol-Gel Science and Technology, 2010, 56(2): 121–127

[15] Bokare A, Sanap A, Pai M, . Antibacterial activities of Nd doped and Ag coated TiO₂ nanoparticles under solar light irradiation. Colloid and Surface B: Biointerfaces, 2013, 102: 273–280

[16] Hu C, Lan Y, Qu J, . Ag/AgBr/TiO₂ visible light photocatalyst for destruction of azodyes and bacteria. The Journal of Physical Chemistry B, 2006, 110(9): 4066–4072

[17] Liu Q, Ding J, Mante F K, . The role of surface functional groups in calcium phosphate nucleation on titanium foil: a self-assembled monolayer technique. Biomaterials, 2002, 23(15): 3103–3111

[18] Yeom Y H, Li M, Sachtler W M H, . Low-temperature NO_x reduction with ethanol over Ag/Y: A comparison with Ag/γ-Al₂O₃ and BaNa/Y. Journal of Catalysis, 2007, 246(2): 413–427

[19] Zhao S, Ma Y, Qu Z, . The performance of Ag doped V₂O₅‒TiO₂ catalyst on the catalytic oxidation of gaseous elemental mercury. Catalysis Science & Technology, 2014, 4(11): 4036–4044

[20] Xu H, Yan J, Xu Y, . Novel visible-light-driven AgX/graphite-like C₃N₄ (X= Br, I) hybrid materials with synergistic photocatalytic activity. Applied Catalysis B: Environmental, 2013, 129: 182–193

[21] Tian B, Dong R, Zhang J, . Sandwich-structured AgCl@Ag@TiO₂ with excellent visible-light photocatalytic activity for organic pollutant degradation and E. coli K12 inactivation. Applied Catalysis B: Environmental, 2014, 158‒159: 76–84

[22] Yu J, Dai G, Huang B. Fabrication and characterization of visible-light-driven plasmonic photocatalyst Ag/AgCl/TiO₂ nanotube arrays. The Journal of Physical Chemistry C, 2009, 113(37): 16394–16401

[23] Zhao S, Qu Z, Yan N, . Ag-modified AgI‒TiO₂ as an excellent and durable catalyst for catalytic oxidation of elemental mercury. RSC Advances, 2015, 5(39): 30841–30850

[24] Jing Z, Tan L, Li F, . Photocatalytic and antibacterial activities of CdS nanoparticles prepared by solvothermal method. Indian Journal of Chemistry Section A: Inorganic Bio-Inorganic Physical Theoretical & Analytical Chemistry, 2013, 52(1): 57–62

[25] Feng Y, Feng N, Zhang G, . One-pot hydrothermal synthesis of ZnS-reduced grapheme oxide composites with enhanced photocatalytic properties. CrystEngComm, 2014, 16(2): 214–222

[26] Khanchandani S, Kundu S, Patra A, . Band gap tuning of ZnO/In₂S₃ core/shell nanorod arrays for enhanced visible-light-driven photocatalysis. The Journal of Physical Chemistry C, 2013, 117(11): 5558–5567

[27] Ali R F, Gates B D. Synthesis of lithium niobate nanocrystals with size focusingthrough an Ostwald ripening process. Chemistry of Materials, 2018, 30(6): 2028–2035

[28] Yu J, Zhang J. A simple template-free approach to TiO₂ hollow spheres with enhanced photocatalytic activity. Dalton Transactions, 2010, 39(25): 5860–5867

[29] Hu C, Peng T, Hu X,. Plasmon-induced photodegradation of toxic pollutants with Ag‒AgI/Al₂O₃ under visible-light irradiation. Journal of the American Chemical Society, 2010, 132(2): 857–862 doi:10.1021/ja907792d

[30] Liu X E, Sun C, Yue Y D, . Synthesis and characterization of three-dimensional sea urchin-like AgBr/TiO₂ microspheres with enhanced antibacterial and visible-light photocatalytic performance. Chemical Papers, 2019, 73(8): 1971–1978 doi:10.1007/s11696-019-00749-2

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