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The sorption mechanisms of Th(Ⅳ) on attapulgite

查看全文 作　　者：PAN DuoQiang FAN QiaoHui DING KeFei LI Ping LU Yan YU Tao XU Jiang WU [1]WangSuo 高影响力作者 机构地区：[1]Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China高影响力机构 出　　处：《Science China Chemistry》索引2011年第54卷第7期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (20871062, J1030932);the Fundamental Research Funds for the Central Universities (lzujbky-2010-215);the National Synchrotron Radiation Innovation Foundation of Ministry of Education (20090137S) 摘　　要：The surface properties of intrinsic and activated attapulgite were studied using potentiometric titration.The sorption mechanisms of Th(IV) on intrinsic and activated attapulgite were investigated by employing surface complexation model and FITEQL 3.2 code.The results indicated that the sorption sites of intrinsic attapulgite involved in the sorption process were main ion exchange site(≡ XNa/K),strong site(≡ SsOH) and weak site(≡ SwOH),while only strong site(≡ SsOH) and weak site(≡ SwOH) were predominant for activated attapulgite.At pH < 2.5,the species of Th(IV) was main Th4+ in aqueous solution;then the hydrolysis species of Th(IV)(i.e.,Th(OH)22+,Th(OH)+3 and Th(OH)04) gradually formed as pH increasing.For the sorption of Th(IV) on intrinsic attapulgite,both ion exchange species(≡ X2Th) and inner-sphere surface complexes(≡ SsOTh) were dominant,while only inner-sphere surface complexes(i.e.,≡ SsOThOH and ≡ SwOTh) were observed for Th(IV) sorption to activated attapulgite.In the presence of humic acid(HA),the sorption of Th(IV) on activated attapulgite was obviously enhanced;and both ≡ SsOH-HA-Th and ≡ SsOTh were the predominant speciation.It was also interesting to find that the addition of HA obviously provoked the desorption behavior of Th(IV). 关 键 词：凹凸棒石粘土 吸附机制 表面复合物 钍 表面络合模型 离子交换 电位滴定法 表面性能
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