Mesoporous silica SBA-15 functionalized with phosphonate and amino groups for uranium uptake

查看全文 作　　者：WANG [1,2]XiaoLiang;[2,3]YUANLiYong;WANG [1]YanFei;LI [2,3]ZiJie;LIU [1,2]YaLan;FENG [2,3]YiXiao;ZHAO [2,3]YuLiang;CHAI [2,3]ZhiFang;SHI [2,3]WeiQun

机构地区：[1]Department of Applied Chemistry,School of Chemistry and Chemical Engineering,University of South China,Hengyang 421001,China;[2]Key Laboratory of Nuclear Analytical Techniques,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;[3]Key Laboratory for Biomedical Effects of Nanomaterials&Nanosafety Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China Chemistry》索引2012年第55卷第9期,共7页

基　　金：supported by the National Natural Science Foundation of China (91026007);the 'Strategic Priority Research program' of the Chinese Academy of Sciences (XDA03010401,XDA03010403) 摘　　要：Mesoporous silicas have a very attractive ability of sorption and enrichment of metal ions due to their huge surface area and facile functionalization by organic ligands.In this work,phosphonate-amino bifunctionalized mesoporous silica SBA-15(PA-SBA-15) as U(VI) sorbent was fabricated through post-grafting method.The obtained mesoporous silica was characterized by SEM,XRD,NMR and nitrogen sorption/desorption experiments,which revealed the existence of ordered mesoporous structure with uniform pore diameter and large surface area.The adsorptivity of PA-SBA-15 for U(VI) from aqueous solution was investigated using batch sorption technique under different experimental conditions.The preliminary results show that the U(VI) sorption by PA-SBA-15 is very quick with equilibrium time of less than 1 h,and the U(VI) uptake is as large as 373 mg/g at pH 5.5 under 95 ℃.The sorption isotherm has been successfully modeled by the Langmuir isotherm,suggesting a monolayer homogeneous sorption of U(VI) in PA-SBA-15.The sorption is pH-dependent due to the pH-dependent charge of sorbent in the aqueous solution.The thermodynamics research shows that the sorption is a feasible and endothermic process.Based on these results,PA-SBA-15 could be a promising solid phase sorbent for highly-efficient removal of U(VI) ions from waste water and enrichment of U(VI) from a solution at a very low level. 关键词：SBA-15 吸收功能氨基酸膦酸酯介孔分子筛 LANGMUIR吸附介孔二氧化硅固相吸附剂

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Mesoporous silica SBA-15 functionalized with phosphonate and amino groups for uranium uptake

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