Few-layer WS2 modified BiOBr nanosheets with enhanced broad-spectrum photocatalytic activity towards various pollutants removal

被引：65

作者：

Fu, Shuai ^{[1
]}

Liu, Xianming ^{[3
]}

Yan, Yunhui ^{[4
]}

Li, Li ^{[1
]}

Liu, Haiping ^{[1
]}

Zhao, Fengying ^{[1
]}

Zhou, Jianguo ^{[1
,2
]}

机构：

[1] Henan Normal Univ, Henan Engn Lab Environm Funct Mat & Pollut Contro, Key Lab Yellow River & Huai River Water Environm, Sch Environm,Minist Educ, Xinxiang 453007, Henan, Peoples R China

[2] Minist Educ, Key Lab Green Chem Media & React, Xinxiang 453007, Henan, Peoples R China

[3] Luoyan Normal Univ, Coll Chem & Chem Engn, Luoyang 471934, Henan, Peoples R China

[4] Xinxiang Med Univ, Sch Basic Med Sci, Dept Chem, Xinxiang 453007, Henan, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2019年 / 694卷

关键词：

Few-layer; WS2; BiOBr; Heterostructure; Photocatalytic degradation; EFFICIENT PHOTODEGRADATION; ORGANIC-DYES; DEGRADATION; HETEROJUNCTION; FABRICATION; COMPOSITES; CIPROFLOXACIN; PERFORMANCE; NANOSTRUCTURES; NANOPARTICLES;

D O I：

10.1016/j.scitotenv.2019.133756

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Herein, an efficient broad-spectrum WS2/BiOBr heterostructure with ultrathin nanosheet was successfully prepared by one-pot hydrothermal route. The self-assembled flower-likeWS(2)/BiOBr nanostructure was formed by few-layer WS2 and BiOBr nanosheets. The optimized heterojunction presented broad-spectrum high-efficiency photocatalytic activity towards the removal of various pollutants under visible-light irradiation, including organic dyes, antibiotics and phenols. This efficiency was linked to high light harvesting combined with effective charge separation/transfer. Meanwhile, the degradation efficiencies varied with nature of the pollutant decreased in the following order: LR5B (99%) > MNZ (97%) > TC (92%) > OTC (92%) > RhB (90%) > CIP (83%) > MB (78%) > MO (62%) > bisphenol (42%) > phenol (40%). The photocatalytic process of ciprofloxacin was explored, and the results indicated that high ciprofloxacin concentrations, low pH values and elevated concentrations of ions (PO43-, HPO42-, H2PO4-, and Cu2+) restrained the photocatalytic performances. Trapping experiments and ESR revealed the significant contribution of holes (h(+)) in the mechanism, where both superoxide radicals (center dot O-2(-)) and hydroxyl radicals (center dot OH) acted as assistants. Overall, this work could offer a new protocol for the design of highly efficient heterostructure photocatalysts for environmental remediation. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：13

共 63 条

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