文献类型：期刊文献

英文题名：Highly efficient AgBr/h-MoO3 with charge separation tuning for photocatalytic degradation of trimethoprim: Mechanism insight and toxicity assessment

作者：Cai, Zhengqing[1];Song, Yougui[1];Jin, Xibiao[1];Wang, Chong-Chen[2];Ji, Haodong[3];Liu, Wen[3];Sun, Xianbo[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Lab High Concentrat Refractory Organ Wa, Shanghai 200237, Peoples R China;[2]Beijing Univ Civil Engn & Architecture, Beijing Key Lab Funct Mat Bldg Struct & Environm, Sch Environm & Energy Engn, Beijing 100044, Peoples R China;[3]Peking Univ, Coll Environm Sci & Engn, Minist Educ, Key Lab Water & Sediment Sci, Beijing 100871, Peoples R China

年份：2021

卷号：781

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20211810294927);WOS:【SCI-EXPANDED(收录号:WOS:000655618600006)】；

基金：This work was supported by the National Key Research and Development Program (2019YFC0408202), National Natural Science Foundation of China (41807340), the National Key Research and Development Program (2016YFC0402505), and National Water Pollution Control and Treatment Science and Technology Major Project (2017ZX07207002).

语种：英文

外文关键词：Photocatalysis; AgBr/h-MoO3; Charge separation tuning; Trimethoprim; Toxicity

摘要：A highly solar active AgBr/h-MoO(3 )composite was constructed by a facile precipitation method, and the charge separation tuning was achieved by photoreduction of AgBr. The photoreduced Ag-0 on AgBrili-MoO3 acted as charge transfer bridge to form Z-scheme heterostructure, while the high degree of Ag reduction converted the material into type-II heterostructure. The synthesized optimal material promoted charge separation and visible light activity due to the incorporation of highly solar active AgBr, which showed ca. 2 times activity on trimethoprim (TMP) degradation than h-MoO3. The contribution of reactive species on TMP degradation followed the order of O-2(center dot-) > O-1(2) > h(+), which agree well with the proposed charge separation mechanism. The photocatalytic degradation mechanism of TMP was proposed based on the radical quenching, intermediate analysis and DFT calculation. The toxicity analysis based on QSAR calculation showed that part of the degradation intermediates are more toxic than TMP, thus sufficient mineralization are required to eliminate the potential risks of treated water. Moreover, the material showed high stability and activity after four reusing cycles, and it is applicable to treat contaminants in various water matrix. This work is expected to provide new insight into the charge separation tuning mechanism for the AgX based heterojunction, and rational design of highly efficient photocatalysts for organic contaminants degradation by solar irradiation. (C) 2021 Elsevier B.V. AU rights reserved.