Bi2WO6/MIL-101光催化降解水中四环素的性能与机理

蔡奉颖; 许煜航; 龙浩然; 袁语馨; 张宇晴; 何秋香; 吕健

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中国环境科学 ›› 2024, Vol. 44 ›› Issue (8) : 4652-4660.

美丽中国建设:新污染物

Bi₂WO₆/MIL-101光催化降解水中四环素的性能与机理

蔡奉颖¹, 许煜航¹, 龙浩然¹, 袁语馨¹, 张宇晴², 何秋香¹, 吕健¹

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Performance and mechanism of photocatalytic tetracycline degradation by Bi₂WO₆/MIL-101in water

CAI Feng-ying¹, XU Yu-hang¹, LONG Hao-ran¹, YUAN Yu-xin¹, ZHANG Yu-qing², HE Qiu-xiang¹, Lü Jian¹

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摘要

利用水热法制备Bi₂WO₆/MIL-101(BWO/MIL-101)异质结光催化剂,并研究其在可见光下降解水中四环素(tetracycline;TC)的性能及机理.结果表明,Bi₂WO₆纳米片在MIL-101载体表面致密生长形成BWO/MIL-101异质结材料后可见光催化TC降解的性能明显提高.其中,结构优化的BWO/MIL-101-40在60min内的TC降解效率为85.9%,其反应速率常数是Bi₂WO₆的1.4倍,是MIL-101的3.1倍,且BWO/MIL-101在中性及碱性环境中表现出稳定且良好的光催化性能.能带结构分析表明,Bi₂WO₆/MIL-101构成II型异质结,有效拓宽了可见光响应范围,加快光生载流子的迁移速率,并抑制e^-和h⁺的复合.通过自由基猝灭实验和电子顺磁共振(EPR)测试发现,在光催化体系中超氧自由基(•O₂^-)和空穴(h⁺)是反应的主要活性物种.

Abstract

The Bi₂WO₆/MIL-101composite photocatalysts were synthesized via a hydrothermal method to facilitate the degradation of tetracycline (TC) under visible light. Research findings demonstrated that the TC degradation efficiency of Bi₂WO₆ under visible light was significantly enhanced following the dense growth of BWO nanosheets on the surface of MIL-101. Furthermore, the structurally optimized BWO/MIL-101-40exhibited a TC degradation efficiency of 85.9% within 60minutes, with a reaction rate constant approximately 1.4 times that of Bi₂WO₆ and 3.1times that of MIL-101. Additionally, BWO/MIL-101 displayed consistent and robust photocatalytic performance in neutral and alkaline conditions. Band structure analysis revealed the formation of type II heterojunctions between Bi₂WO₆ and MIL-101, contributing to effective photoelectron-hole separation. Quenching experiments and electron paramagnetic resonance (EPR) tests indicated superoxide radical (•O₂^-) and holes (h⁺) as the primary active species in this particular photocatalytic system.

导出引用

蔡奉颖, 许煜航, 龙浩然, 袁语馨, 张宇晴, 何秋香, 吕健. Bi₂WO₆/MIL-101光催化降解水中四环素的性能与机理[J]. 中国环境科学. 2024, 44(8): 4652-4660

CAI Feng-ying, XU Yu-hang, LONG Hao-ran, YUAN Yu-xin, ZHANG Yu-qing, HE Qiu-xiang, Lü Jian. Performance and mechanism of photocatalytic tetracycline degradation by Bi₂WO₆/MIL-101in water[J]. China Environmental Science. 2024, 44(8): 4652-4660

中图分类号： X703.5

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