光催化
降级(电信)
化学
异质结
可见光谱
光化学
羟基化
激进的
纳米复合材料
电子顺磁共振
化学工程
纳米技术
材料科学
催化作用
有机化学
光电子学
工程类
物理
酶
电信
核磁共振
计算机科学
作者
Rongsheng Ning,Heliang Pang,Zhongsen Yan,Zhenyu Lu,Qian-Kun Wang,Zeng-ling Wu,Wenxin Dai,Ling-Shan Liu,Zhongsheng Li,Gongduan Fan,Xianzhi Fu
标识
DOI:10.1016/j.jhazmat.2022.129061
摘要
The development of high efficient photocatalysts for antibiotics contamination in water remains a severe challenge. In this study, a novel step-scheme (S-scheme) photocatalytic heterojunction nanocomposites were fabricated from integrating AgCl nanoparticles on the MIL-100(Fe) octahedron surface through facile multi-stage stirring strategy. The S-scheme heterojunction structure in AgCl/MIL-100(Fe) (AM) nanocomposite provided a more rational utilization of electrons (e - ) and holes (h + ), accelerated the carrier transport at the junction interface, and enhanced the overall photocatalytic performance of nanomaterials. The visible-light-driven photocatalysts were used to degrade sulfamethazine (SMZ) which attained a high removal efficiency (99.9%). The reaction mechanisms of SMZ degradation in the AM photocatalytic system were explored by electron spin resonance (ESR) and active species capture experiments, which superoxide radical (•O 2 - ), hydroxyl radical (•OH), and h + performed as major roles. More importantly, the SMZ degradation pathway and toxicity assessment were proposed. There were four main pathways of SMZ degradation, including the processes of oxidation, hydroxylation, denitrification, and desulfonation. The toxicity of the final products in each pathway was lower than that of the parent according to the toxicity evaluation results. Therefore, this work might provide new insights into the environmentally-friendly photocatalytic processes of S-scheme AM nanocomposites for the efficient degradation of antibiotics pollutants. • A novel S-scheme AgCl/MIL-100(Fe) photocatalyst was synthesized. • This S-scheme heterojunction showed excellent activities for sulfamethazine degradation. • The degradation mechanism and pathways of sulfamethazine were investigated. • Toxicity of the sulfamethazine degradation intermediates decreased as the reaction proceeded.
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