文献类型：期刊文献

英文题名：Adsorption-reduction strategy of U(VI) on NZVI-supported zeolite composites via batch, visual and XPS techniques

作者：Li, Qian[1,2];Wang, Huihui[1];Chen, Zhongshan[1,2,3];He, Xuan[1];Liu, Yang[1];Qiu, Muqing[2];Wang, Xiangxue[1,3,4]

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]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[3]Jinan Univ, Sch Environm, Guangdong Prov Key Lab Environm Pollut & Hlth, Guangzhou, Peoples R China;[4]Southwest Univ Sci & Technol, Fundamental Sci Nucl Wastes & Environm Safety Lab, Mianyang 621010, Sichuan, Peoples R China

年份：2021

卷号：339

外文期刊名：JOURNAL OF MOLECULAR LIQUIDS

收录：SCI-EXPANDED(收录号：WOS:000691312600030)、、EI(收录号：20212610549329)、Scopus(收录号：2-s2.0-85108338285)、WOS

基金：Financial support from the Fundamental Research Funds for the Central Universities (2019MS044), the National Key Research and Development Program of China (2017YFA0207002) and the Guangdong Provincial Key Laboratory of Environmental Pollution and Health (No. GZKLEPH201815) are acknowledged.

语种：英文

外文关键词：U(VI); NZVI/MCM composites; Decontamination; Adsorption and reduction

外文摘要：Nanoscale zero valent iron (NZVI) modified MCM zeolite composites (NZVI/MCM) were obtained by reduction and in-situ growth process, and were characterized by SEM, TEM, XRD, HRTEM, TEM-EDS, and XPS techniques. Investigation results showed that the surface of NZVI/MCM were coated with NZVI particles mainly in the range of 10-100 nm, and only part of NZVI particles > 100 nm or <10 nm. The synthesized composites were applied as adsorbents for U(VI) removal from aqueous solutions. The maximum U(VI) removal capacity on NZVI/MCM was calculated to be 216 mg/g at pH = 5.6 and T = 298 K. Further advanced spectroscopy analysis showed that U(VI) adsorption and reduction could be enhanced by NZVI/MCM due to the synergistic effect between NZVI and MCM. Meanwhile, the adsorption of U(VI) was related with the surface functional groups (e.g., -OH, Fe-O and Si-O functional groups) and the reduction of U(VI) to U(IV) was ascribed to the oxidation of Fe-0 and Fe(II) on the core-shell of NZVI. The results were helpful for the simultaneous adsorption-reduction of U(VI) on the composites. This work highlights the adsorption-reduction-solidification strategy for the elimination of U(VI) in wastewater cleanup. (C) 2021 Elsevier B.V. All rights reserved.