Adsorption Kinetics of Methylene Blue from Aqueous Solutions onto Palygorskite  

作　　者：PENG Shuchuan WANG Shisheng CHEN Tlanhu JIANG Shaotong HUANG Chuanhui 

机构地区：[1]School of Resources and Environmental Engineering, Hefei University of Technology, Heifei, Anhui 230009 [2]Department of Soil Chemistry and Environmental Protection, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008 [3]Department of Chemistry, University of Sciences and Technology of China, Heifei, Anhui 230009

出　　处：《Acta Geologica Sinica(English Edition)》2006年第2期236-242,共7页地质学报（英文版）

基　　金：Financial supports from National Natural Science Foundation of China （No. 40472026 and No. 40072017）

摘　　要：The adsorption kinetics of methylene blue from aqueous solutions on purified palygorskite was investigated. The kinetics data related to the adsorption of methylene blue from aqueous solutions are in good agreement with the pseudo-second order equation in ranges of initial concentration of 120-210 mg/L, oscillation speed of 100-200 r/min and temperature of 298-328K. The experimental results show that methylene blue is only adsorbed onto the external surface of purified palygorskite, and the apparent adsorption activation energy is 13.92 kJ/mol. The relatively low apparent adsorption activation energy suggests that the adsorption of methylene blue involves in not only a chemical, but also a physical adsorption process, and it is controlled by the combination of chemical adsorption and fiquid-film diffusion.The adsorption kinetics of methylene blue from aqueous solutions on purified palygorskite was investigated. The kinetics data related to the adsorption of methylene blue from aqueous solutions are in good agreement with the pseudo-second order equation in ranges of initial concentration of 120-210 mg/L, oscillation speed of 100-200 r/min and temperature of 298-328K. The experimental results show that methylene blue is only adsorbed onto the external surface of purified palygorskite, and the apparent adsorption activation energy is 13.92 kJ/mol. The relatively low apparent adsorption activation energy suggests that the adsorption of methylene blue involves in not only a chemical, but also a physical adsorption process, and it is controlled by the combination of chemical adsorption and fiquid-film diffusion.

关 键 词：purified palygorskite ADSORPTION methylene blue KINETICS 

分 类 号：P578.6[天文地球—矿物学]