文献类型：期刊文献

英文题名：Application of EXAFS with a bent crystal analyzer to study the pH dependent microstructure of Eu(III) onto birnessite

作者：Dong, Lijia[1];Liao, Qing[1];Linghu, Wensheng[1];Huang, Yuying[2];Shen, Runpu[1];Alsaedi, Ahmed[4];Wang, Jin[3];Hayat, Tasawar[4,5];Sheng, Guodong[1]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Coll Life Sci, Shaoxing 312000, Zhejiang, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Shanghai 201204, Peoples R China;[3]Guangzhou Univ, Coll Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China;[4]King Abdulaziz Univ, Fac Sci, Dept Math, NAAM Res Grp, Jeddah 21589, Saudi Arabia;[5]Quaid I Azam Univ, Dept Math, Islamabad 44000, Pakistan

年份：2018

卷号：6

期号：1

起止页码：842

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000434777800091)、、EI(收录号：20190406413968)、Scopus(收录号：2-s2.0-85058705910)、WOS

基金：Financial supports from National Natural Science Foundation of China (31700476, 11175244), and China Postdoctoral Science Foundation Grant (2016M591140, 2017T100055) are acknowledged. The authors thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) for providing the beam time.

语种：英文

外文关键词：Eu(III); Interaction mechanism; Microstructure; delta-MnO2

外文摘要：Herein, Eu(III) retention mechanism and microstructure on delta-MnO2 as a function of solution pH were studied using both the conditional macroscopic method and molecular-level high resolution EXAFS technique with a bent crystal analyzer. The results suggested that the sorption Eu(III) onto delta-MnO2 was strongly dependent on pH but not on ionic strength, implying the formation of inner-sphere surface complexation for Eu(III) on delta-MnO2 surface. Molecular-level results from EXAFS methods showed that Eu was surrounded by similar to 80 atoms in first coordination shell at REu-O approximate to 2.42 angstrom, and second shell of Mn atoms at REu-Mn approximate to 3.91 angstrom was found in four sorption samples from different solution pH. All this results reflected the formation of a bidentate surface complex with Eu(III) bonding by corner sharing to MnO6-octahedron on delta-MnO2 surface. Both the macroscopic findings and microstructure of Eu(III) at the delta-MnO2-water interface enhance our understanding for the reaction dynamics and states of Eu(III) and related radionuclides in natural environment.