文献类型：期刊文献

英文题名：The adsorption of U(VI) on carbonaceous nanofibers: A combined batch, EXAFS and modeling techniques

作者：Hu, Baowei[1];Hu, Qingyuan[2];Xu, Di[3];Chen, Chengguang[2]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Yuanpei Coll, Dept Architectural Engn, Shaoxing 312000, Peoples R China;[3]Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China

年份：2017

卷号：175

起止页码：140

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000392037600016)、、EI(收录号：20164903084059)、Scopus(收录号：2-s2.0-84998723908)、WOS

基金：Financial supports from the Science and Technology Project of Shaoxing (2014B70041) are acknowledged.

语种：英文

外文关键词：CNFs; Radionuclide; Adsorption mechanism; EXAFS; Surface complexation modeling

外文摘要：The adsorption mechanism between U(VI) and carbonaceous nanofibers (CNFs) was demonstrated by batch, EXAFS and surface complexation modeling. The batch experiments indicated that the adsorption of U(VI) on CNFs decreased with increasing ionic strength at pH < 4.0, whereas the U(VI) adsorption was independent of ionic strength at pH 4.0-7.0. The adsorption kinetics and isotherms of U(VI) adsorption can be satisfactorily fitted by pseudo-second-order kinetic model and Langmuir model, respectively. The maximum adsorption capacity of CNFs for U(VI) calculated from Langmuir model at pH 4.5 and 293 K was 52.63 mg/g. The results of EXAFS analysis revealed that the adsorption mechanism of U(VI) on the CNFs at pH 4.0 was outer-sphere surface complexation, whereas inner-sphere surface complexation/surface co-precipitate dominated the adsorption mechanism of U(VI) on the CNFs at pH 7.0. The adsorption of U(VI) on CNFs can be fitted by double diffuse layer modeling with an outer-sphere surface complexes (SOHUO22+ species) and an inner-sphere surface complexes (SOUO2+ species) very well. The findings presented herein showed that CNFs can be regarded as a promising candidate for the preconcentration and immobilization of radionuclides from aqueous solutions in environmental remediation. (C) 2016 Elsevier B.V. All rights reserved.