Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10559590 | Talanta | 2011 | 6 Pages |
Abstract
A new material has been synthesized using dry process to activate bentonite followed by N-(2-hydroxyethyl) ethylenediamine connecting chlorosilane coupling agent. The synthesized new material was characterized by elemental analysis, FT-IR and thermogravimetry which proved that bentonite was successfully modified. The most interesting trait of the new material was its selective adsorption for rare earth elements. A variety of conditions of the new material were investigated for adsorption. The optimal conditions were determined with respect to pH and shaking time. Samarium (Sm) was quantitatively adsorbed at pH 4 and shaking time of 2 min onto the new material. Under these conditions the maximum static adsorption capacity of Sm(III) was found to be 17.7 mg gâ1. The adsorbed Sm(III) ion were quantitatively eluted by 2.0 mL 0.1 mol Lâ1 HCl and 5% CS (NH2)2 solution. According to IUPAC definition, the detection limit (3Ï) of this method was 0.60 ng mLâ1. The relative standard deviation (RSD) under optimum conditions was less than 3% (n = 8). The new material also was applied for the preconcentration of trace Sm(III) in environmental samples with satisfactory results.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Dandan Li, Xijun Chang, Zheng Hu, Qihui Wang, Ruijun Li, Xiaoli Chai,