Synthesis of nano- alumina powder from impure kaolin and its application for arsenite removal from aqueous solutions

Journal of Environmental Health Science Engineering

Ehsan Taheri-Nassaj³  Yaser Kianinia¹  Ahmad Khodadadi Darban² 

[1] Department of Mineral Processing Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran;Department of Environmental Engineering, Tarbiat Modares Environmental Research Center, Tarbiat Modares University, Tehran, Iran;Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran

关键词: Kaolin;    Isotherm;    Removal;    Arsenite;    Nano- alumina;   

Others  :  1164667
DOI  :  10.1186/2052-336X-11-19

 received in 2012-07-23, accepted in 2013-07-07,  发布年份 2013

【 摘 要 】

Adsorption is considered a cost-effective procedure, safer to handle with high removal efficiency. Activated alumina is the most commonly used adsorbent for the removal of arsenic from aqueous solutions. However, activated alumina has a low adsorption capacity and acts kinetically in a slow manner. An ideal adsorbent should have a high surface area, physical and/or chemical stability and be inexpensive. To meet this requirement, nanomeso porous γ-alumina with a high surface area (201.53 m²/g) and small particle size (22–36 nm) was prepared from inexpensive kaolin as the raw material, by precipitation method. The research results showed that adsorbent has the high adsorption capacity (for initial arsenite concentration up to 10 mg/L, in which 97.65% recovery was achieved). Optimal experimental conditions including pH, initial arsenite concentration and contact time were determined. Langmuir, Freundlich and Dubinin– Radushkevich isotherm models were applied to analyze the experimental data. The best interpretation for the experimental data was given by Langmuir adsorption isotherm equation and the maximum arsenite adsorbed by synthesized nano γ–alumina (qe) was found to be 40 (mg/g).

【 授权许可】

   
2013 Khodadadi Darban et al.; licensee BioMed Central Ltd.

【 图 表 】

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