文献类型：期刊文献

英文题名：Excellent photoreduction performance of U(VI) on metal organic framework/covalent organic framework heterojunction by solar-driven

作者：Zhong, Xin[1];Liu, Yuxin[1];Zeng, Wuxin[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：2022

卷号：285

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000781665700001)、、EI(收录号：20220111415825)、Scopus(收录号：2-s2.0-85121987017)、WOS

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

语种：英文

外文关键词：U(VI); Metal organic framework; Covalent organic framework; Adsorption; Photoreduction

外文摘要：The conversion of uranium(U) from soluble U(VI) into insoluble U(IV) by photocatalytic reduction is an implementable removal technology. In this investigation, two common MOFs photocatalysts (MOF-In, MOF-Ti) and the assembled MOF@COF (2D Schiff base, NH2-MIL-125(Ti)@TpPa-1) were applied for photocatalytic reduction of U(VI). These as-synthesized photocatalysts were characterized by XRD, SEM, TEM, XPS, DRS, EIS, photocurrent and Mott-Schottky plots. The results shown that the constructed NH2--MIL-125(Ti)@TpPa-1 heterojunction not only broadened the scope of visible light response to orange light (600 nm), but also expedited the separation of photogenerated carriers and facilitated the U(VI) photoreduction. Specially, the photoreduction removal rates of U(VI) were NH2--MIL-68(In) (55.6%), NH2--MIL-125(Ti) (57.7%), NH2--MIL-125(Ti)@TpPa-1 (81.6%), and the heterojunction of NH2--MIL-125(Ti)@TpPa-1 was about 1.5-fold higher than that of NH2-MIL-125(Ti). Meanwhile, during the photoreduction process, photogenerated electrons and superoxide radicals played the dominant roles in converting U(VI) into U(IV). Moreover, the presence of active Ti3+ and oxygen vacancy could effectively promote superoxide radical generation and inhibit recombination of photogenerated carriers. Combined with the U(VI) adsorption by NH2--MIL-125(Ti)@TpPa-1 in previously studied, altogether, MOF@COF hybridization can play a synergistic role of adsorption-photocatalytic reduction in the practical application of U(VI) elimination. Therefore, it can be predicted that 2D COF-based hybridization materials have a brilliant application prospect in pollutant purification by solar energy.