文献类型：期刊文献

英文题名：Synthesis of amidoxime-decorated 3D cubic mesoporous silica via self-assembly co-condensation as a superior uranium(VI) adsorbent

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

第一作者：肖江;Xiao, Jiang

通信作者：Jia, YZ[1]

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

年份：2019

卷号：277

起止页码：843-855

外文期刊名：JOURNAL OF MOLECULAR LIQUIDS

收录：;EI(收录号：20190306372247);Scopus(收录号：2-s2.0-85059812444);WOS:【SCI-EXPANDED(收录号:WOS:000460845900094)】；

基金：This work was supported by the National Natural Science Foundation of China (grant number U1407117).

语种：英文

外文关键词：KIT-6; Uranium; Amidoxime; Sorption behavior; XPS; Mechanism

摘要：In the present study, amidoxime hybrid mesoporous silicas (denoted KIT-6-AO samples) were synthesized via co-condensation of tetraethoxysilane (TEOS) with 2-cyanoethyltriethoxysilane (CPTES) and then reduced in a hydroxylamine hydrochloride solution. The adsorbents were characterized using SAXRD, SEM, TEM, N-2 adsorption-desorption isotherms, FT-IR, elemental analysis, and Zeta potential test. Batch experiments were conducted to investigate the adsorption of U(VI) in KIT-6-AO samples. Experimental data indicates that the amidoxime-functionalized KIT-6-AO-20% shows the best adsorption performance, and the maximum monolayer U(VI) sorption capacity was calculated to be 323.94 mg.g(-1) at 298 K and pH = 5.0 with the Langmuir model. Adsorption equilibrium was reached within 45 min in KIT-6-AO-20% sample. The sorption behavior of U(VI) on KIT-6 and KIT-6-AO-20% were strongly dependent on pH and independent of ionic strength. In addition, sorption kinetic and thermodynamic results suggest that the sorption reaction was a spontaneous, endothermic, and chemical process. Furthermore, the U(VI) adsorption mechanism on amidoxime groups was also investigated using XPS and FT-IR analysis. We found that the entanglement of electrons of the N atom in -C=NOH and/or -C-NH2 and the O atoms in C=NOH coordinated with U(VI) to form strong complexes. Overall, the synthesized KIT-6-AO samples could be used as effective materials for removal U(VI) from aqueous solutions. (C) 2019 Elsevier B.V. All rights reserved.