Efficient photocatalytic tetracycline elimination over Z-scheme g-C3N4/Bi5O7I heterojunction under sunshine light: Performance, mechanism, DFT calculation and pathway

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2023-06-15 DOI:10.1016/j.jallcom.2023.169468

Dongyu Tan, Fei Huang, Shenjia Guo, Danqin Li, Yi Yan, Wu Zhang

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引用次数: 14

Abstract

A series of Z-scheme heterojunction g-C₃N₄/Bi₅O₇I composites were fabricated via a facile electrostatic self-assembly procedure. The optimum 15%-g-C₃N₄/Bi₅O₇I displayed good degradation efficiency toward tetracycline (TC) under visible light irradiation. The improvement of photocatalytic efficiency was mainly attributed to the generation of photo-induced h⁺ and O₂^•− radical. The migration route of photo-induced h⁺ and e⁻ between g-C₃N₄ and Bi₅O₇I was investigated by XPS analysis, EPR test, photocatalytic mechanism and DFT calculations. The degradation pathways and the toxicological simulation of TC were evaluated. It was revealed that the intermediates produced during degradation process exhibited lower toxicity than the pristine TC. In addition, 15%-g-C₃N₄/Bi₅O₇I exhibited good stability and reusability. Considering its potentials in practical application, 15%-g-C₃N₄/Bi₅O₇I displayed high photocatalytic efficiency under natural sunlight irradiation. In all, this work offered a deep insight into the photocatalytic mechanism of tetracycline degradation over bismuth-rich bismuth oxyhalide/g-C₃N₄ heterojunction photocatalysts.

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阳光下Z-scheme g-C3N4/Bi5O7I异质结高效光催化四环素消除:性能、机理、DFT计算和途径

采用简易静电自组装方法制备了一系列z型异质结g-C3N4/Bi5O7I复合材料。在可见光照射下，15%-g-C3N4/Bi5O7I对四环素(TC)具有良好的降解效果。光催化效率的提高主要归功于光诱导h+和O2•−自由基的生成。通过XPS分析、EPR测试、光催化机理和DFT计算，研究了光诱导h+和e−在g-C3N4和Bi5O7I之间的迁移途径。对TC的降解途径和毒理学模拟进行了评价。结果表明，降解过程中产生的中间体毒性低于原始TC。此外，15%-g-C3N4/Bi5O7I具有良好的稳定性和可重用性。考虑到其实际应用潜力，15%-g-C3N4/Bi5O7I在自然日光照射下表现出较高的光催化效率。总之，这项工作为富铋氧化卤化铋/g-C3N4异质结光催化剂降解四环素的光催化机制提供了深入的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.