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In-situ designed Bi metal @ defective Bi2O2SO4 to enhance photocatalytic NO removal via boosted directional interfacial charge transfer
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.jhazmat.2024.136951 Qin Geng, Hongtao Xie, Ye He, Si Chen, Fan Dong, Yanjuan Sun
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.jhazmat.2024.136951 Qin Geng, Hongtao Xie, Ye He, Si Chen, Fan Dong, Yanjuan Sun
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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.
更新日期：2024-12-20
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