期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 435, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129061
关键词
Metal-organic framework; S-scheme heterojunction; Photocatalysis; Visible light; Toxicity assessment
资金
- National Natural Science Foundation of China [52000034]
- Natural Science Foundation of Fujian Province [2020J05125]
- Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment [SKLPEE-KF202108]
- Shanghai Tongji Gao Tingyao Environmental Science and Technology Development Foundation
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, which showed promising performance in degrading sulfamethazine (SMZ) and provided insights into the degradation pathways and toxicity evaluation.
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 (center dot O-2(- )), hydroxyl radical (center dot 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 nano composites for the efficient degradation of antibiotics pollutants.
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