文献类型：期刊文献

英文题名：Enhanced Photoreduction of U(VI) on C3N4 by Cr(VI) and Bisphenol A: ESR, XPS, and EXAFS Investigation

作者：Wang, Huihui[1,2,3,4];Guo, Han[1];Zhang, Ning[1];Chen, Zhongshan[1];Hu, Baowei[4];Wang, Xiangke[1,2,3]

机构：[1]North China Elect Power Univ, Coll Environm Sci & Engn, MOE Key Lab Resources & Environm Syst Optimizat, Beijing 102206, Peoples R China;[2]Soochow Univ, Sch Radiol & Interdisciplinary Sci, Suzhou 215123, Peoples R China;[3]Jiangsu Higher Educ Inst, Collaborat Innovat Ctr Radiat Med, Suzhou 215123, Peoples R China;[4]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China

年份：2019

卷号：53

期号：11

起止页码：6454

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000470793900036)、、WOS

基金：Financial support from the National Key Research and Development Program of China (2017YFA0207002), the National Natural Science Foundation of China (21836001, 21822602, 21607042, 21607156), the Science Challenge Project (TZ2016004), and the Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection and the Priority Academic Program Development of Jiangsu Higher Education Institutions are acknowledged.

语种：英文

外文关键词：Absorption spectra - Chromium metallography - Electron spin resonance spectroscopy - Extended X ray absorption fine structure spectroscopy - Heavy metals - Irradiation - Magnetic moments - Organic pollutants - Phenols - Photocatalytic activity - X ray absorption - X ray absorption near edge structure spectroscopy - X ray photoelectron spectroscopy

外文摘要：The effect of Cr(VI) and bisphenol A (BPA) on U(VI) photoreduction by C3N4 photocatalyst was demonstrated by the batch experiments, electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) techniques. The batch experiments manifested that Cr(VI) and BPA enhanced the photocatalytic activity of C3N4 for U(VI) photoreduction, whereas U(VI) photoreduction was significantly diminished with increased pH from 4.0 to 8.0. According to radical scavengers and ESR analysis, U(VI) was photoreduced to U(IV) by photogenerated electrons of conduction band edge, whereas Cr(VI) was reduced to Gr(III) by H2O2. BPA and its products such as organic acid and alcohols can capture photoinduced holes, which resulted in the enhancement of U(VI) photoreduction to U(IV). XPS and XANES analyses demonstrated that U(VI) was gradually photoreduced to U(IV) by C3N4 within irradiation 60 min, whereas U(IV) was reoxidized to U(VI) with increasing irradiation time. EXAFS analysis determined that the dominant interaction mechanisms of U(VI) on C3N4 after irradiation for 240 min were reductive precipitation and inner-sphere surface complexation. This work highlights the synergistic removal of radionuclides, heavy metals, and persistent organic pollutants by C3N4, which is crucial for the design and application of a high-performance photocatalyst in actual environmental cleanup.