Author/Authors :
Khodadadi Darban، Khodadadi Darban, Ahmad نويسنده Department of Mining Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, I.R. IRAN , , Kianinia، Yaser نويسنده Department of Mineral Processing Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran , , Taheri-Nassaj، Ehsan نويسنده Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran ,
Abstract :
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
?-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 ?–alumina (qe) was found to be 40 (mg/g).
