Aquatic environment

Removal of copper ions from aqueous solution by calcium alginateimmobilized kaolin

Yanhui Li , Bing Xia , Quansheng Zhao , Fuqiang Liu , Pan Zhang , Qiuju Du , Dechang Wang , Da Li , Zonghua Wang , Yanzhi Xia


Received March 11, 2010,Revised September 03, 2011, Accepted , Available online

Volume 23,2011,Pages 404-411

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Kaolin has been widely used as an adsorbent to remove heavy metal ions from aqueous solutions. However, the lower heavy metal adsorption capacity of kaolin limits its practical application. A novel environmental friendly material, calcium alginate immobilized kaolin (kaolin/CA), was prepared using a sol-gel method. The e ects of contact time, pH, adsorbent dose, and temperature on Cu2+ adsorption by kaolin/CA were investigated. The Langmuir isotherm was used to describe the experimental adsorption, the maximum Cu2+ adsorption capacity of the kaolin/CA reached up to 53.63 mg/g. The thermodynamic studies showed that the adsorption reaction was a spontaneous and endothermic process.

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