文献类型：期刊文献

英文题名：XANES and EXAFS investigation of uranium incorporation on nZVI in the presence of phosphate

作者：Qiu, Muqing[1];Wang, Min[2];Zhao, Qingzhou[3];Hu, Baowei[1];Zhu, Yuling[1]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[2]Xian Univ Technol, State Key Lab Base Ecohydraul Engn Arid Area, Jing Hua Rd 5, Xian 710048, Shaanxi, Peoples R China;[3]Univ Chinese Acad Sci, Coll Resources & Environm, 19 A Yuquan Rd, Beijing 100049, Peoples R China

年份：2018

卷号：201

起止页码：764

外文期刊名：CHEMOSPHERE

收录：SCI-EXPANDED(收录号：WOS:000430895300084)、、EI(收录号：20181805118240)、Scopus(收录号：2-s2.0-85046042363)、WOS

基金：Financial support from National Natural Science Foundation of China (No. 21577093) and Science and Technology Project of Shaoxing (No. 2014B70041) are acknowledged.

语种：英文

外文关键词：Uranium; Phosphate; nZVI; XANES; EXAFS

外文摘要：Effect of phosphate on the reduction of U(VI) on nZVI was determined by batch, XPS, XANES and EXAFS techniques. The batch experiments showed that nZVI was quite effective for the removal of uranium under the anaerobic conditions, whereas the addition of phosphate enhanced uranium removal over wide pH range. At low pH, the reduction of U(VI) to U(IV) significantly decreased with increasing phosphate concentration by XPS and XANES analysis. According to EXAFS analysis, the occurrence of U U shell at 10 mg/L phosphate and pH 4.0 was similar to that of (UO2)-O-(Iv)(s), whereas the U-P and U Fe shells were observed at 50 mg/L phosphate, revealing that reductive co-precipitate ((UO2)-O-(Iv)(s)) and precipitation of uranyl-phosphate were observed at low and high phosphate, respectively. The findings are crucial for the prediction of the effect of phosphate on the speciation and binding of uranium by nZVI at low pH, which is significant in controlling the mobility of U(VI) in contaminated environments. (C) 2018 Elsevier Ltd. All rights reserved.