Study on Adsorption of Rare Earth Elements by Kaolinite  

作　　者：万鹰昕 刘丛强 

机构地区：[1]State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [2]Graduate School of Chinese Academic of Sciences, Beijing 100039, China [3]College of Arts and Sciences of Beijing Union University, Beijing 100083, China

出　　处：《Journal of Rare Earths》2005年第3期377-381,共5页稀土学报（英文版）

基　　金：theChineseAcademyofSciences (KZCX2 10 5 )andNationalNaturalScienceFoundationofChina(4 962 5 3 0 4)

摘　　要：For better understanding the adsorption of rare earth elements (REEs) by clay minerals and its controlling factors, the experiments on adsorption of REEs in solutions with 1 g·L-1 kaolinite were performed at different conditions. The results are as follows: the REEs reach equilibrium in the adsorption-desorption process for 24; Langmuir′s adsorption curve is used for modeling the adsorption of REEs by kaolinite; a general trend is that the higher the contents of REEs are, the less obvious the fractionation is. Furthermore, there is significant effect of pH on the adsorption and fractionation of REEs by kaolinite, and the REEs distribution coefficient increases with increasing pH. When pH is nearly neutral, as reaches 7, heavy REEs are more adsorbed than light REEs.For better understanding the adsorption of rare earth elements (REEs) by clay minerals and its controlling factors, the experiments on adsorption of REEs in solutions with 1 g·L-1 kaolinite were performed at different conditions. The results are as follows: the REEs reach equilibrium in the adsorption-desorption process for 24; Langmuir′s adsorption curve is used for modeling the adsorption of REEs by kaolinite; a general trend is that the higher the contents of REEs are, the less obvious the fractionation is. Furthermore, there is significant effect of pH on the adsorption and fractionation of REEs by kaolinite, and the REEs distribution coefficient increases with increasing pH. When pH is nearly neutral, as reaches 7, heavy REEs are more adsorbed than light REEs.

关 键 词：PEDOLOGY KAOLINITE ADSORPTION distribution coefficient rare earths 

分 类 号：O647.32[理学—物理化学]