Abstract:The acrylic acid(AA)-modified carboxymethyl cellulose(CMC) resin was prepared and was explored to adsorb uranium(VI) ions from aqueous solution in a batch system. The experimental results showed that on the condition of reaction temperature 70~80℃, CMC 30%~35% (w/w), CMC to AA (w/w) of 10:2.5 and reaction time 3.5~4h, the modification effect was the best. High removal efficient of U(VI) was obtained 97.1% at temperature of 25℃, pH value of 5.0, dosage of modified CMC resin 0.1 g/L and contact time of 60 min. It was found that the adsorption process was best described by Freundlich model and pseudo-first-order kinetic model (R2=0.9618), indicating that the adsorption was mainly on the surface of the resin. Thermodynamics parameters of negative value of ΔG0 and positive value of ΔH0 revealed the spontaneity and endothermic nature of the adsorption. The adsorption was primarily due to physical adsorption.
周书葵, 曾光明, 刘迎九, 杨金辉, 蒋海燕. 改性羧甲基纤维素对铀吸附机理的试验研究[J]. 中国环境科学, 2011, 31(9): 1466-1471.
ZHOU Shu-Kui, ZENG Guang-Ming, LIU Ying-Jiu, YANG Jin-Hui, JIANG Hai-Yan. Equilibrium, kinetic and thermodynamic study of the adsorption of uranium (VI) onto modified CMC. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(9): 1466-1471.