Effect of Anion on Adsorption of Rare Earth Elements on Kaolinite
来源期刊：JOURNAL OF RARE EARTHS2007年增刊第1期
论文作者：Wan Yingxin Liu Jianjun
Key words：rare earth elements (REEs); adsorption; anion; kaolinite;
Abstract: For a better understanding the adsorption of rare earth elements (REEs) on minerals and its controlling factors, adsorption experiments were performed with kaolin in a matrix of various concentration of anion (Cl-, ClO4-, SO42-) in the pH 6.5. The adsorption of REEs onto the kaolin increase with increasing anion concentration, especially in the presence of SO42-, which is ascribe to the Na+ mass effect and anion complexation. furthermore, the heavy REEs are more adsorbed onto kaolin in presence of higher concentration of anion, especially for Cl- and SO42-, presumably due to the difference of anion complexation with light REE and heavy REEs.
Wan Yingxin1，Liu Jianjun3
(1.The College of Arts and Sciences of Beijing Union University, Beijing 100083, China;
2.The Institute of Indoor Environment of Beijing Union University, Beijing 100083, China;
3.The National Astronomic Observation, CAS, Beijing 100085, China)
Abstract:For a better understanding the adsorption of rare earth elements (REEs) on minerals and its controlling factors, adsorption experiments were performed with kaolin in a matrix of various concentration of anion (Cl-, ClO4-, SO42-) in the pH 6.5. The adsorption of REEs onto the kaolin increase with increasing anion concentration, especially in the presence of SO42-, which is ascribe to the Na+ mass effect and anion complexation. furthermore, the heavy REEs are more adsorbed onto kaolin in presence of higher concentration of anion, especially for Cl- and SO42-, presumably due to the difference of anion complexation with light REE and heavy REEs.
Key words:rare earth elements (REEs); adsorption; anion; kaolinite;
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