In situ preparation of visible-light-driven carbon quantum dots/NaBiO3 hybrid materials for the photoreduction of Cr(Ⅵ)

查看全文 作　　者：Yixiao [1,2]Wu;Chunlong [3,4]Chen;Shu [5]He;Xuesong [1]Zhao;Shaobin [1]Huang;Gongchang [1]Zeng;Yingying [1]You;Ying [1]Cao;Lishan [1]Niu 机构地区：[1]School of Environment and Energy,South China University of Technology,Higher Education Mega Center,Guangzhou 510006,China;[2]Qiannan Normal University for Nationalities,Duyun 558000,China;[3]Physical Sciences Division,Physical and Computational Sciences Directorate,Pacific Northwest National Laboratory,Richland,WA 99354,USA;[4]Department of Chemical Engineering,University of Washington,Seattle,WA 98101,USA;[5]School of Enuironment,Higher Education Mega Center,Harbin Institute of Technology,Harbin 150000,China 出　　处：《Journal of Environmental Sciences》索引2021年第33卷第1期,共10页 基　　金：the funding provided by Key-Area Research and Development Program of Guangdong Province;Research Project of Guangzhou Municipal Science and Technology Bureau;the National Natural Science Foundation of China;National Key R&D Program of China(No.2019YFC0408605)。 摘　　要：In this study,different carbon quantum dots(CQDs)/NaBiO3 hybrid materials were synthesized as photocatalysts to effectively utilize visible light for the photocatalytic degradation of contaminants effectively.These hybrid materials exhibit an enhanced photocatalytic reduction of hexavalent chromium(Cr(Ⅵ))in the aqueous medium.Zero-dimensional nanoparticles of CQDs were embedded within the two-dimensional NaBiO3 nanosheets by the hydrothermal process.Compared with that of the pure NaBiO3 nanosheets,the photocatalytic performance of the hybrid catalysts was significantly high and 6 wt.%CQDs/NaBiO3 catalyst exhibited better photocatalytic performance.We performed the first-principles density functional theory calculations to study the interfacial properties of pure NaBiO3 nanosheets and hybrid photocatalysts,and confirmed the CQDs played an important role in the CQDs/NaBiO3 composites.The experimental results indicated that the enhanced reduction of Cr(Ⅵ)was probably due to the high loading of CQDs(electron acceptor)on NaBiO3,which made NaBiO3 nanomaterials to respond in visible light and significantly improved their electron-hole separation efficiency. 关 键 词：Carbon quantum dots/NaBiO3 Hybrid materials Visible light response Cr(Ⅵ)reduction