期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
The sorption mechanisms of Th(Ⅳ) on attapulgite 被引量:6
1
作者 PAN DuoQiang FAN QiaoHui DING KeFei LI Ping LU Yan YU Tao XU Jiang WU WangSuo 《Science China Chemistry》 SCIE EI CAS 2011年第7期1138-1147,共10页
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 surf... 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 Yh(OH)40) 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). 展开更多
关键词 attapuigite Th(IV) HA SORPTION DESORPTION surface complexation model
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部