文献类型：期刊文献

英文题名：Visible-light-driven 2D/2D Bismuth oxyhalides/covalent organic framework heterojunctions for synchronous photocatalytic U(VI) reduction and bisphenol A degradation

作者：Zhong, Xin[1];Ling, Qian[1];Wang, Shuai[1];Hu, Baowei[1]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China

年份：2022

卷号：10

期号：4

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000861614800001)、、EI(收录号：20222712321477)、Scopus(收录号：2-s2.0-85133395274)、WOS

基金：Financial support from the Research Fund Program of National Natural Science Foundation of China (No. 22106107) , Natural Science Foundation of Zhejiang Province (GF21C030001) .

语种：英文

外文关键词：BiOX; COFs; BiOX@TpPa-1; U(VI); BPA; Photoreduction

外文摘要：Bismuth oxyhalides (BiOX, X = Cl, Br, I) with two-dimensional (2D) layered structures have strong photocatalytic properties. 2D covalent organic frameworks (COFs) are metal-free photocatalysts with extended pi-conjugated layer structure, high specific surface area and chemical stabilities, and have extraordinary application potential. Here, the novel double layer of BiOX@TpPa-1 composites were constructed to integrate the advantages of narrow bandgap and efficient separation of photogenerated carriers. After TpPa-1 modification, the bandgap of BiOX can be adjusted from 2 to 3 eV to 1.5-1.84 eV due to electronic rich pi-conjugated system of TpPa-1, which remarkably increased the utilization of solar energy. The optimal doping ratio of BiOX@TpPa-1-5% manifested the highest catalytic activity for simultaneous U(VI) reduction (48.6%-81.2%) and bisphenol A (BPA) (43.4%-57.6%) degradation under visible light, which can be attributed to the existence of oxygen vacancies and the efficient production of electrons and center dot O2 radicals. After deducting the dark adsorption reaction, compared with the single BiOX (10%-30%), the removal efficiencies of BiOX@TpPa-1 (42.6%-53.6%) for photoreduction U (VI) were significantly improved, especially for BiOCl@TpPa-1. The enhanced photocatalytic performance of BiOX@TpPa-1 was systematically identified by photoelectrochemical characterizations, such as PL, MottSchottky plots, EIS, I-t. Furthermore, the efficiency of BiOX@TpPa-1 for the photocatalytic U(VI) reduction and BPA degradation remained relatively stable after recycling, exhibiting the good reusability and stability. Therefore, this study provided the construction of inorganic-organic composite photocatalysts with excellent performance and stability for the extensive application prospect in the field of environmental purification.