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

机构：[1] MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China; [2] School for Radiological and Interdisciplinary Sciences, Soochow University, Collaborative Innovation Center of Radiation Medicine, Jiangsu Higher Education Institutions, Suzhou, 215123, China; [3] School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, China

年份：2019

卷号：53

期号：11

起止页码：6454

外文期刊名：Environmental Science and Technology

收录：EI(收录号：20192407025696)、Scopus(收录号：2-s2.0-85066864105)

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 Cr(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. ? 2019 American Chemical Society.