Construction of novel ternary dual Z-scheme Ag 3 VO 4 /C 3 N 4 /reduced TiO 2 composite with excellent visible-light pho
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Construction of novel ternary dual Z-scheme Ag3VO4/ C3N4/reduced TiO2 composite with excellent visible-light photodegradation activity Xuehua Yan1,a), Xiaoxue Yuan2, Jinging Wang2, Qiong Wang2, Chen Zhou2, Dongfeng Wang2, Hua Tang2, Jianmei Pan2, Xiaonong Cheng3 1
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; Institute for Advanced Materials, Jiangsu University, Zhenjiang, Jiangsu 212013, China; and Institute of Green Materials and Metallurgy, Jiangsu University, Zhenjiang, Jiangsu 212013, China School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China 3 School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; and Institute of Green Materials and Metallurgy, Jiangsu University, Zhenjiang, Jiangsu 212013, China a) Address all correspondence to this author. e-mail: [email protected] 2
Received: 4 March 2019; accepted: 16 April 2019
A novel and highly efficient Ag3VO4/C3N4/reduced TiO2 microsphere composite was obtained through a hydrothermal and depositional process. The microstructure, individual components with different proportions, and optical properties of the ternary nanocomposites were intensively studied. The prepared ternary composites exhibited superior photocatalytic performance of degradation of methylene blue compared with single component and S1 (C3N4/reduced TiO2) binary composites, demonstrating that the introduction of Ag3VO4 into g-C3N4/r-TiO2 can effectively improve the photocatalytic activity. Recycling experiments confirmed that the nanocomposites exhibited superior cycle performance. The enhanced capability could be attributed to a synergetic effect including the formation of heterojunction, large surface area, improved light absorption, matched energy band structure, and the improved separation efficiency of photogenerated charges coming from dual Z-scheme structure. Particularly, the introduction of Ag3VO4 makes the dual Z-scheme charge transfer pathway completed with improved separation efficiency and stronger redox ability of photogenerated electrons and holes. The work provides a promising method to develop a new dual Z-scheme photocatalytic system to remove environmental pollutant.
Introduction Using semiconductor photocatalysts to degrade organic pollutants [1, 2] and produce H2 from water splitting [3] under solar irradiation has drawn more and more attention due to its distinctive advantages in terms of low cost, nontoxicity, clean, lack of secondary pollution, and environmentally friendly [4, 5, 6]. Therefore, photocatalytic technology has become an important key to solve the problems of environmental remediation in the future. It is essential to synthesize high-efficiency semiconductor photocatalysts for promoting the practical applications of photocatalytic technology. Over the past four decades, TiO2, as one of the most important semiconductor photocatalysts, has become an international research focus in the green chemistry field since the discover
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