Adsorptive Removal of Radionuclide Cs+ in Water using Acid Active Clay

Journal of the Korean Chemical Society

article

Jae Sung Lee¹  Su Jin Kim¹  Ye Eun Kim¹  Seong Yun Kim¹  Eun Kim²  Keon Sang Ryoo¹ 

[1] Department of Applied Chemistry, Andong National University;Gyeongbuk Science High School

关键词: Adsorbent;    Aid active clay;    Cs+;    Adsorption;    Isotherm;   

DOI  :  10.5012/jkcs.2022.66.2.78

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Natural white clay was treated with 6 M of H2SO4 and heated at 80oC for 6 h under mechanical stirring and theresulting acid active clay was used as an adsorbent for the removal of Cs+ in water. The physicochemical changes of naturalwhite clay and acid active clay were observed by X-ray Fluorescence Spectrometry (XRF), BET Surface Area Analyser andEnergy Dispersive X-line Spectrometer (EDX). While activating natural white clay with acid, the part of Al2O3, CaO, MgO,SO3 and Fe2O3 was dissolved firstly from the crystal lattice, which bring about the increase in the specific surface area and thepore volume as well as active sites. The specific surface area and the pore volume of acid active clay were roughly twice ashigh compared with natural white clay. The adsorption of Cs+ on acid active clay was increased rapidly within 1 min andreached equilibrium at 60 min. At 25 mg L- of Cs+ concentration, 96.88% of adsorption capacity was accomplished by acidactive clay. The adsorption data of Cs+ were fitted to the adsorption isotherm and kinetic models. It was found that Langmuirisotherm was described well to the adsorption behavior of Cs+ on acid active clay rather than Freundlich isotherm. For adsorption Cs+ on acid active clay, the Langmuir isotherm coefficients, Q, was found to be 10.52 mg g-1. In acid active clay/watersystem, the pseudo-second-order kinetic model was more suitable for adsorption of Cs+ than the pseudo-first-order kineticmodel owing to the higher correlation coefficient R2 and the more proximity value of the experimental value qe,exp and the calculated value qe,cal. The overall results of study showed that acid active clay could be used as an efficient adsorbent for theremoval of Cs+ from water.

【 授权许可】

Unknown