半胱氨酸盐酸盐改性膨润土对铀的吸附研究

doi:10.13218/j.cnki.csdc.2014.03.029

Abstract

Abstract: Using bentonite as raw material,the modified bentonite was prepared by ion exchange reaction of bentonite with cysteine hydrochloride.Uranium adsorption behavior of the modified bentonite,as well as effect of initial mass concentration and pH on the adsorption were investigated and described.Adsorption isotherms,adsorption thermodynamics and adsorption kinetics of uranium onto modified bentonite were also studied.The results showed that the adsorption capacity of the modified bentonite for uranium is significantly higher than that of unmodified bentonite.The adsorption pattern of uranium onto the modified bentonite follows the Langmuir model very well,and the maximum adsorption capacity of the modified bentonite is 39.06 mg·g^-1.The adsorption process is an endothermic reaction and higher temperature is favorable for adsorption of uranium.The pseudo-second-order kinetics model was used to describe the adsorption process,and the adsorption kinetics constant was found to be 0.017 90 g·mg^-1·min^-1.

Key words: bentonite, cysteine hydrochloride, uranium, adsorption behavior

CLC Number:

WANG Guang-hui, HU Su-hang, HAN Chen. Study on adsorption of uranium onto bentonite modified by cysteine hydrochloride[J].China Surfactant Detergent & Cosmetics, 2014, 44(3): 126-130.

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Study on adsorption of uranium onto bentonite modified by cysteine hydrochloride

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