Removal of Heavy Metals Cr (VI), Cd (II) and Ni (II) from Aqueous Solution by Bioabsorbtion of Elaeagnus Angustifolia

Abstract

The problem of removing pollutants from water is an important process and is becoming more<br />important with the increasing of industrial activities. One of the most important environmental problems is<br />water resources pollution by Heavy metals. Bioabsorbtion is affordable adsorbents for the removal of heavy<br />metals from aqueous solutions. This study explores the adsorption potential of Cr (VI), Cd (II) and Ni (II) by Elaeagnus angustifolia fruit powder in aqueous solution. The influences of several main parameters such as pH value of solution, sorbent amount, initial metal ion concentration, and contact time in batch experiments have been studied. The adsorption was depended on pH, adsorbent dosage, and contact time. Maximum removal of Cr (VI), Cd (II) and Ni (II) were obtained 7.19mg/g, 2.42 mg/g and 1.97 mg/g respectively. Adsorption isotherms were compared with both Langmuir and Freundlich adsorption models. The experimental data best fit with the Langmuir isotherm model. Experimental results show natural biosorbent was effective for the removal of pollutants from aqueous solution.