文献类型：期刊文献

英文题名：2D redox-active COF with the anthraquinone structure for photocatalytic reduction of uranium

作者：Ling, Qian[1];Kuang, Peiling[1];Zhong, Xin[1];Hu, Baowei[1]

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

年份：2023

卷号：639

外文期刊名：APPLIED SURFACE SCIENCE

收录：SCI-EXPANDED(收录号：WOS:001065842000001)、、EI(收录号：20233414582823)、Scopus(收录号：2-s2.0-85167963592)、WOS

基金：Financial support from the Research Fund Program of National Natural Science Foundation of China (No. 22106107) , and Natural Science Foundation of Zhejiang Province (LY23B070003) .

语种：英文

外文关键词：COFs; U(VI); Adsorption; Photoreduction

外文摘要：Photocatalysis can be an effective technology for the conversion of U(VI) to U(IV) because it is efficient, facile and free of secondary pollution. In this work, anthraquinone-functionalized covalent organic framework (DQTP) was fabricated by an irreversible tautomerization of 2,6-diaminoanthraquinone (DQ) and 2, 4, 6-triformylphloroglucinol (TP) in the beta-ketoenamine structure. The resultant DQTP could be effectively used as a metal-free heterogeneous catalyst for the photoreduction of U(VI) (k = 0.00287 min(-1)). The pivotal role of anthraquinone moieties as the active sites for U(VI) reduction was evidenced, i.e., to promote charge separation and thus enhance photocatalytic activity, as well as the production of H2O2 followed by the formation of (UO2)O-2 center dot 2H(2)O with U(VI) through in-situ reactions. Additionally, free radical capture experiments and spectrometry analysis were conducted to determine the synergistic reduction mechanism of photogenerated electrons, superoxide radicals and hydrogen peroxide. It was reassuring that this work could provide the research basis for the subsequent development of more practical metal-free photocatalysts for the purification of U(VI)-containing wastewater.