A novel Ag-BiOBr-rGO photocatalyst for enhanced ketoprofen degradation: Kinetics and mechanisms

被引：51
作者：
Xu, Guanghui [1 ,2 ]
Li, Ming [1 ,2 ]
Wang, Yang [1 ]
Zheng, Na [1 ]
Yang, Li [1 ]
Yu, Hongwen [1 ]
Yu, Yong [1 ]
机构：
[1] Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun 130102, Jilin, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
SCIENCE OF THE TOTAL ENVIRONMENT | 2019年 / 678卷
基金：
中国国家自然科学基金;
关键词：
Photocatalysis; BiOBr; Ag; Reduced graphene oxide; Ketoprofen; MUNICIPAL WASTE-WATER; CO-MODIFIED BIOBR; GRAPHENE OXIDE; HETEROGENEOUS PHOTOCATALYSIS; NANOCOMPOSITES; HYBRID; PHARMACEUTICALS; HETEROJUNCTION; TRANSFORMATION; MICROSPHERES;
D O I：
10.1016/j.scitotenv.2019.04.418
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Ag-BiOBr-reduced graphene oxide (rGO) was synthesized for the first time and used to promote photocatalytic activity under visible-light irradiation. The Ag-BiOBr-rGO showed an excellent photocatalytic activity to degrade ketoprofen compared with other photocatalysts. The composites were comprehensively characterized to explore the mechanisms of the enhancement. Electron Paramagnetic Resonance and scavenger experiments demonstrated that the superoxide radical was the active species. Ketoprofen was completely removed in 120 min. The high photocatalytic activity and stability of the catalyst indicated that the Ag-BiOBr-rGO may have broad application prospects for eliminating pharmaceuticals from wastewater. Four reaction intermediates of ketoprofen were detected by LC-MS/MS and degradation routes were proposed. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码：173 / 180
页数：8
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