Samarium (III) adsorption on bentonite modified with N-(2-hydroxyethyl) ethylenediamine.
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 g(-1). The adsorbed Sm(III) ion were quantitatively eluted by 2.0 mL 0.1 mol L(-1) HCl and 5% CS (NH(2))(2) solution. According to IUPAC definition, the detection limit (3σ) of this method was 0.60 ng mL(-1). 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.
Department of Chemistry, Lanzhou University, Lanzhou, PR China.
Dandan
D
Li
Xijun
X
Chang
Zheng
Z
Hu
Qihui
Q
Wang
Ruijun
R
Li
Xiaoli
X
Chai
D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D005029:Ethylenediamines / Q000737:chemistry*; D057230:Limit of Detection; D015394:Molecular Structure; D012493:Samarium / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical
D005029:Ethylenediamines; D014874:Water Pollutants, Chemical; D001546:Bentonite; D012493:Samarium; C031234:ethylenediamine