原子能科学技术Issue(10)：1692-1699,8.DOI:10.7538/yzk.2013.47.10.1692
红壤胶体对U（Ⅵ）的吸附性能及机理
Sorption and Mechanism of Aqueous U(Ⅵ) Onto Red Soil-colloid
摘要
Abstract
By static adsorption experiments ,the effects of pH ,ionic strength ,adsorp-tion time ,uranium initial concentration ,adsorbent dosage ,red soil-colloid size ,and organic matters on the biosorption capacity of red soil-colloid extracted from the soil around uranium tailing for uranium were studied .The adsorption process was analyzed by thermodynamics and kinetics ,and the adsorption mechanism was characterized by the element analysis ,infrared spectroscopy and scanning electron microscopy .The results show that the adsorption capacity for U (Ⅵ ) on red soil-colloid increases with the decrease of ionic strength or particle size ,increases with the initial concentration of uranium ,decreases with the increase of the amount of red soil-colloid ;the saturated adsorption capacity qmax can be up to 76.76 μg/mg by red soil-colloid which diameter is less than 1 μm at 25 ℃ and pH=3.5 ,when the ionic strength is 0.001 mol/L .FT-IR micrograph before and after red soil-colloid adsorbed uranyl ions indicates that the red soil-colloid are mainly composed of hydroxyl ,carbonyl ,Si-O ,Si-O-Fe ,etc .The adsorption of U(Ⅵ) on red soil-colloid follows Langmuir adsorption isotherm ,and the pseudo-second-order equation provides the best correlation for the adsorption process .关键词
红壤胶体/吸附/U(Ⅵ)/机理Key words
red soil-colloid/adsorption/U(Ⅵ)/mechanism分类
资源环境引用本文复制引用
夏良树,黄欣,曹存存,吕俊文,陈伟..红壤胶体对U（Ⅵ）的吸附性能及机理[J].原子能科学技术,2013,(10):1692-1699,8.基金项目
国家自然科学基金资助项目（10975070）；湖南省高等学校科学研究项目资助 （）
