文献类型：期刊文献

英文题名：In-situ growth of COF on BiOBr 2D material with excellent visible-light-responsive activity for U(VI) photocatalytic reduction

作者：Zhong, Xin[1];Liu, Yuxin[1];Wang, Shuai[1];Zhu, Yuling[1];Hu, Baowei[1]

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

年份：2021

卷号：279

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000700584500001)、、EI(收录号：20213710896558)、Scopus(收录号：2-s2.0-85114713932)、WOS

基金：Financial support from the Research Fund Program of National Natural Science Foundation of China (No. 22106107, 22076124), Natural Science Foundation of Zhejiang Province (GF21C030001), and the Key Research Program of Shaoxing University (2019LG1003).

语种：英文

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

外文摘要：By integrating of adsorption and photoreduction for uranium(U), the covalent organic frameworks (COF, TpPa-1) and the heterostructure BiOBr@TpPa-1 were investigated. The results of electron spin resonance and photo electrochemical tests (UV-vis DRS, PL, EIS, I-t and Mott-Schottky plots) showed, TpPa-1 not only was provided with oxygen vacancies, which could act as inter-band level to enhance visible light capture and reduce the recombination of photogenerated carriers, but also possessed pi-electron conjugated structure, which could broaden the spectral absorption range and prolong the lifetime of photo-generated charges by surface hybridization. Consequently, the in-situ formation of TpPa-1 on BiOBr surface can significantly improve the photo catalytic performance of BiOBr for U(VI) reduction. Under visible-light irradiation, the superior photocatalytic performance of BiOBr@TpPa-1 generated reactive oxygen species and photoelectrons, which can efficiently reduce U(VI) pre-enriched in the framework of TpPa-1. Approximately 91% of U(VI) was photo-reduced within 540 min. Meanwhile, combined with surface analysis techniques (SEM, TEM, XRD and XPS) to reveal the mechanism of U(VI) photoreduction. Thus, the application of COFs as photocatalytic reductant was expanded, providing a sustainable alternative for visible-light-driven the conversion of high valent radionuclide ions in wastewater.