Enhanced visible light photocatalysis of Bi2O3/BiVO4 and Bi2O3/Ag3VO4 heterojunctions: effects of synthetic procedures

被引:0
作者
Wu, Chung-Hsin [1 ]
Dong, Cheng-Di [2 ]
Chen, Chiu-Wen [2 ]
Lin, Yi-Li [3 ]
Jhu, Syuan-Ru [1 ]
Lin, Yong-Hui [1 ]
机构
[1] Natl Kaohsiung Univ Sci & Technol, Dept Chem & Mat Engn, 415 Chien Kung Rd, Kaohsiung, Taiwan
[2] Natl Kaohsiung Univ Sci & Technol, Dept Marine Environm Engn, Kaohsiung, Taiwan
[3] Natl Kaohsiung Univ Sci & Technol, Dept Safety Hlth & Environm Engn, Kaohsiung, Taiwan
关键词
BiVO4; Ag3VO4; Bi2O3; Heterojunction; Hydrothermal; Photocatalysis; P-N HETEROJUNCTION; PHOTOINDUCED CHARGE-TRANSFER; FACILE SYNTHESIS; METHYLENE-BLUE; RHODAMINE-B; PHOTODEGRADATION ACTIVITY; COMPOSITE FILMS; SOLAR-LIGHT; EFFICIENT; DEGRADATION;
D O I
10.5004/dwt.2021.26492
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
In this investigation, different synthetic procedures were used to generate Bi2O3 (BOS)/BiVO4 (BVO) and BOS/Ag3VO4 (AVO) composites. The BOS/BVO composites that were produced by single-step and two-step processes were denoted as BB1 and BB2, respectively; the BOS/AVO composites that were formed by these processes were denoted as BA1 and BA2, respectively. All photocatalysts were prepared by a hydrothermal process, except for BOS, which was prepared by a solvothermal process. The prepared composites were characterized by X-ray diffraction, scanning electron microscopy, photoluminescence spectroscopy, UV-vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, and specific surface area analysis. C.I. Reactive Red 2 (RR2) was used as the parent compound in photocatalytic reactions to compare the photoactivities of the photocatalysts. The RR2 photodegradation exhibited pseudo-first-order kinetics. Under visible light irradiation, the RR2 photodegradation rate constants of BVO, AVO, BOS, BB1, BB2, BA1, and BA2 were 0.120, 0.168, 0.042, 0.750, 0.354, 1.062, and 1.244 h(-1), respectively. The improvement of photocatalytic activity was attributed to the prolongation of the lifetime of photo-generated electron-hole pairs in BOS/BVO and BOS/AVO composites. The findings of this study suggest that the photo-generated holes and superoxide anion radicals are the dominant reactive species in the oxidative degradation of RR2 in the UV/BB2 system; additionally, hydroxyl radicals are the dominant oxidative species in the UV/BA2 system.
引用
收藏
页码:267 / 279
页数:13
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