Novel 2D/2D BiOBr/UMOFNs direct Z-scheme photocatalyst for efficient phenol degradation

Lin Biyun; Chen Zhihong; Shui Lingling; Zhou Guofu; Wang Xin

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Novel 2D/2D BiOBr/UMOFNs direct Z-scheme photocatalyst for efficient phenol degradation

机译：新型2D / 2D BioBR / UMOFNS直接Z方案光催化剂，用于高效酚类降解

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A novel 2D/2D BiOBr/ultrathin metal-organic framework nanosheets (UMOFNs) direct Z-scheme photocatalyst was successfully synthesized by using a simple deposition-precipitation method. The photocatalytic performance was evaluated under light irradiation, which revealed that the 2D/2D BiOBr/UMOFNs Z-scheme photocatalyst exhibits higher photocatalytic degradation of phenol compared to pristine BiOBr and UMOFNs. A BiOBr/UMOFNs-40% (mass ratio for BiOBr and UMOFNs of 1:0.4) photocatalyst was found to show the best photocatalytic degradation efficiency and stability, reaching 99% phenol degradation under light irradiation of 270 min and maintaining 97% degradation after 5 recycling runs. Results obtained from a trapping experiment and electron paramagnetic resonance suggest that reactive OH and O-2(-) play a major role in phenol degradation. Photoluminescence and photocurrent results reveal that the excellent photocatalytic activity of the 2D/2D BiOBr/UMOFNs photocatalyst can be ascribed to the efficient separation of photogenerated electron-hole pairs through a direct Z-scheme system. This article provides a possible reference for designing Z-scheme photocatalysts by using MOFs and semiconductors for practical organic pollutant treatment.

机译：采用简单的沉积沉淀法成功地合成了一种新型的2D/2D BiOBr/超薄金属有机骨架纳米片（UMOFNs）直接Z方案光催化剂。在光照下对光催化性能进行了评估，结果表明，2D/2D BiOBr/UMOFNs Z-方案光催化剂对苯酚的光催化降解率高于原始BiOBr和UMOFNs。发现BiOBr/UMOFNs-40%（BiOBr和UMOFNs的质量比为1:0.4）的光催化剂表现出最佳的光催化降解效率和稳定性，在270 min的光照下达到99%的苯酚降解，并在5次循环运行后保持97%的降解。捕获实验和电子顺磁共振结果表明，活性OH和O-2（-）在苯酚降解中起主要作用。光致发光和光电流结果表明，2D/2D BiOBr/UMOFNs光催化剂的优异光催化活性可归因于通过直接Z方案系统有效分离光生电子-空穴对。本文为利用MOF和半导体设计Z型光催化剂，用于实际有机污染物处理提供了可能的参考。

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来源
《Nanotechnology》 |2021年第4期|共12页
作者
Lin Biyun; Chen Zhihong; Shui Lingling; Zhou Guofu; Wang Xin;
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作者单位

South China Normal Univ South China Acad Adv Optoelect Guangzhou 510631 Guangdong Peoples R China;

Guangzhou Univ Key Lab Water Qual &

Conservat Pearl River Delta Guangzhou Peoples R China;

South China Normal Univ South China Acad Adv Optoelect Guangzhou 510631 Guangdong Peoples R China;

South China Normal Univ South China Acad Adv Optoelect Guangzhou 510631 Guangdong Peoples R China;

South China Normal Univ South China Acad Adv Optoelect Guangzhou 510631 Guangdong Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类特种结构材料;
关键词
photocatalysis; BiOBr; UMOFNs; phenol; Z-scheme heterojunction;

机译：光催化;BiOBr;乌莫夫内斯;苯酚;Z型异质结;

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Novel 2D/2D BiOBr/UMOFNs direct Z-scheme photocatalyst for efficient phenol degradation

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