文献类型：期刊文献

英文题名：X-ray absorption fine structure study of enhanced sequestration of U(VI) and Se(IV) by montmorillonite decorated with zero-valent iron nanoparticles

作者：Hu, Baowei[1];Ye, Feng[1];Ren, Xuemei[4];Zhao, Donglin[4,5];Sheng, Guodong[1,2];Li, Hui[1];Ma, Jingyuan[3];Wang, Xiangke[1,2,6];Huang, Yuying[3]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Coll Life Sci, Coll Med Sci, Shaoxing 312000, Zhejiang, Peoples R China;[2]North China Elect Power Univ, Sch Chem & Environm, Beijing 102206, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Shanghai 201204, Peoples R China;[4]Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Peoples R China;[5]Anhui Univ Architecture, Sch Mat & Chem Engn, Hefei 230601, Peoples R China;[6]King Abdulaziz Univ, Fac Sci, NAAM Res Grp, Jeddah 21589, Saudi Arabia

年份：2016

卷号：3

期号：6

起止页码：1460

外文期刊名：ENVIRONMENTAL SCIENCE-NANO

收录：SCI-EXPANDED(收录号：WOS:000391423400022)、、Scopus(收录号：2-s2.0-85000843946)、WOS

基金：Financial support from the National Natural Science Foundation of China (21577093, 21207092, and 21377005), Natural Science Foundation of Zhejiang Province (LY15B070001) is greatly acknowledged. The authors also thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) for providing the beam time.

语种：英文

外文摘要：Herein, using Na-montmorillonite and Al-montmorillonite as templates, supported NZVI with superior reactivity, namely NZVI/Na-Mont and NZVI/Al-Mont, was synthesized and applied for enhanced sequestration of U(VI) and Se(IV). The results indicated that the negatively charged Na-Mont can effectively adsorb cationic U(VI), while the positively charged Al-Mont can adsorb anionic Se(IV), significantly enhancing the rate and extent of U(VI) and Se(IV) sequestration on NZVI due to the synergistic effect between adsorption and reduction. The inhibition effect of 1,10-phenanthroline demonstrated that surface-adsorbed Fe(II) on corrosion products and clay surfaces played an indispensable role in U(VI) and Se(IV) reduction, which was further confirmed by XPS identification. XANES analysis demonstrated that in the NZVI system, Na-Mont and Al-Mont promote the reductive transformation of U(VI) into U(IV), and Se(IV) into Se(0)/Se(-II), respectively. EXAFS analysis indicated the presence of Al/Si scattering for U(VI)-treated NZVI/Na-Mont and Se(IV)-treated NZVI/Al-Mont samples, revealing that Na-Mont and Al-Mont reacted as a scavenger for insoluble products like UO2 and FeSe, thereby, more reactive sites can be used for U(VI) and Se(IV) reduction. Our results suggested that the distinct structure of modified montmorillonite can be utilized for synthesizing supported NZVI to create properties compatible for enhanced enrichment of radionuclides, displaying potential application in nuclear waste management.