文献类型：期刊文献

英文题名：Preconcentration of Uranium(VI) from Aqueous Solution by Amidoxime-Functionalized Microspheres Silica Material: Kinetics, Isotherm and Mechanism Study

作者：Xiao, Jiang[1,2,3,4] Jing, Yan[2,3] Wang, Xingquan[2,3,4] Yao, Ying[2,3] Jia, Yongzhong[2,3]

第一作者：Xiao, Jiang;肖江

通信作者：Jia, YZ[1];Jia, YZ[2]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Zhejiang, Peoples R China;[2]Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Qinghai, Peoples R China;[3]Qinghai Engn & Technol Res Ctr Comprehens Utiliza, Xining 810008, Qinghai, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100049, Peoples R China

年份：2018

卷号：3

期号：43

起止页码：12346-12356

外文期刊名：CHEMISTRYSELECT

收录：;Scopus(收录号：2-s2.0-85057029620);WOS:【SCI-EXPANDED(收录号:WOS:000451062000050)】；

基金：We would like to express our sincere thanks to the National Nature Science Foundation of China (Nos U140710047) for the financial support of this research.

语种：英文

外文关键词：Uranium; Amidoxime-functionalized; Sorption behavior; XPS; Mechanism

摘要：In present study, amidoxime-functionalized MCM-41 microspheres silica materials (denoted as MCM-41-AO) were synthesized and applied to enrich uranium from aqueous mediums. The adsorbents were characterized in detail by SEM, TEM, EDS, FT-IR, elemental analysis and the zero point of change (pHzpc) test. The effects of the pH, ionic strength, contact time, coexisting cations and temperature on the adsorption properties of U(VI) were investigated. The highest sorption capacity of U(VI) on MCM-41-AO was evaluated to be 384.59 mgg(-1) by Langmuir isotherms model at pH=5.00 +/- 0.05 and T=298 +/- 2 K. The adsorption thermodynamics and thermodynamic studies suggest that the U(VI) adsorbed on the amidoxime functionalized microspheres silicas is a chemisorption, spontaneous and endothermic process. In addition, the adsorption mechanism for U(VI) on MCM-41-AO also has been explored by the XPS and FT-IR. The results manifest that the effective adsorption U(VI) is mainly ascribed to the steady formation of surface complexes between uranium ions and the amidoxime ligands.