文献类型：期刊文献

英文题名：Immobilization of U(VI) onto covalent organic frameworks with the different periodic structure by photocatalytic reduction

作者：Zhong, Xin[1];Ling, Qian[1];Ren, Zhenyu[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：326

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：SCI-EXPANDED(收录号：WOS:001042122200001)、、EI(收录号：20231113707411)、Scopus(收录号：2-s2.0-85149790015)、WOS

基金：We sincerely appreciate the "leading talent training plan of colleges and universities in Zhejiang Province". Financial support from the Research Fund Program of National Natural Science Foundation of China (No. 22106107) .

语种：英文

外文关键词：COFs; U(VI) adsorption; U(VI) photoreduction

外文摘要：In recent years, the donor (D)-acceptor (A) covalent organic frameworks (COFs) have attracted more and more attention in photocatalysis, but the photoinduced electron-transfer in the COFs have not been revealed. Herein, three 2D COFs materials (Tp-Tapb, Tp-Taz and TpTt, among them, Tp= 1,3,5-Triformylphloroglucinol, Tapb=1,3,5-tris(4-aminophenyl)-benzene, Tt=melamine, Taz= 4,4 & PRIME;,4 & PRIME;'-(1,3,5-triazine-2,4,6-triyl)-trianiline) with similar structure, different building monomers with number acceptors and the distance between the two acceptors were synthesized. COFs were considered as potential adsorbents to capture uranium (U(VI)) from wastewater due to high specific surface area, stability and heteroatom content. Compared with Tp-Tapb, Tp-Taz and TpTt shown the better photocatalytic performance and the higher separation efficiency of e-- h+, due to the coexistence of triazine and ketone groups. Furthermore, TpTt possessed two short-range acceptor units (triazine and ketone) with the high content of heteroatoms, which exhibited the highest adsorption (505 mg/g) and photoreduction (0.22 h-1) performances. The photocatalytic reduction of U(VI) by these three COFs materials, U (VI) was photo-reduced by e- and & BULL;Oz in the frameworks of photoactive COFs under visible-light irradiation, so then the insoluble U(IV) species (UO2, UO2.9, UO2.87, UO2.82) were deposited in the open channels. COFs served as the composite platform with high catalytic activity and chelating coordination ability. The mutual enhancement of adsorption and photogenerated electron-transfer can realize the efficient removal of U(VI).