In-situ designed Bi metal @ defective Bi2O2SO4 to enhance photocatalytic NO removal via boosted directional interfacial charge transfer

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Qin Geng, Hongtao Xie, Ye He, Si Chen, Fan Dong, Yanjuan Sun
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Abstract

Photocatalytic technology provides a new approach for the harmless treatment of low concentration NOx in the atmosphere. The development of high-performance semiconductor materials to improve the light absorption efficiency and the separation efficiency of photogenerated carriers is the focus of the research. Bismuth oxybismuth sulfate (Bi2O2SO4) shows significant potential for photocatalytic NOx purification due to its unique electronic and layered structure. However, its wide bandgap limits light absorption efficiency in the visible region, resulting in an undesirable photocatalytic activity. The surface plasmon resonance effect presents an effective strategy to enhance the catalytic activity of wide bandgap semiconductors under visible light. In this study, metal Bi loaded Bi2O2SO4 photocatalysts with abundant oxygen vacancies (OVs) were prepared by in-situ reduction with NaBH4, which exhibited a significantly enhanced visible-light catalytic purification of NO. The OVs not only induced the formation of intermediate energy levels and reduced the bandgap, but also enhanced the visible-light absorption ability of Bi2O2SO4 and promoted carrier separation. The Bi metal also promoted the carrier separation and provided more hot electrons for the activation of small molecules to generate reactive radicals, which facilitated the photocatalytic reaction. The photocatalytic NO purification pathway and its performance enhancement mechanism were investigated by combining theoretical calculations and in-situ infrared characterization. This work provides new insights for the development and design of novel Bi-based semiconductors and new materials for the application of low concentration NOx photocatalytic purification process.

Abstract Image

原位设计的铋金属@缺陷Bi2O2SO4通过增强定向界面电荷转移来增强光催化去除NO
光催化技术为大气中低浓度NOx的无害化处理提供了一条新途径。开发高性能半导体材料,提高光生载流子的光吸收效率和光生载流子的分离效率是目前研究的重点。氧化硫酸铋(Bi2O2SO4)由于其独特的电子结构和层状结构,在光催化净化NOx方面显示出巨大的潜力。然而,它的宽带隙限制了可见光区的光吸收效率,导致不理想的光催化活性。表面等离子体共振效应是提高宽禁带半导体在可见光下催化活性的有效策略。本研究采用NaBH4原位还原法制备了具有丰富氧空位(OVs)的金属负载Bi2O2SO4光催化剂,该催化剂对NO的可见光催化净化效果显著增强。OVs不仅诱导了中间能级的形成,减小了带隙,而且增强了Bi2O2SO4的可见光吸收能力,促进了载流子的分离。Bi金属还促进了载流子的分离,为小分子活化提供了更多的热电子,产生活性自由基,有利于光催化反应的进行。通过理论计算和原位红外表征相结合,研究了光催化NO净化途径及其性能增强机理。本研究为新型铋基半导体和应用于低浓度NOx光催化净化工艺的新材料的开发和设计提供了新的见解。
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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