Sorptive removal of cadmium(ii) ions from aqueous solution by mustard biomass
1 Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Department of Environmental Engineering and Management, 73 Prof.dr.docent D. Mangeron Street, 700050 Iasi, Romania
2 Al. I. Cuza University, Faculty of Geography and Geology, Department of Geology, 20A Carol I Street, 700506 Iasi, Romania
3 Romanian Academy, Filial of Iasi, Collective of Geography, 18 Carol I, 700506 Iasi, Romania
4 Academy of Romanian Scientists, 54 Splaiul Independentei, RO-050094 Bucharest, Romania
2 Al. I. Cuza University, Faculty of Geography and Geology, Department of Geology, 20A Carol I Street, 700506 Iasi, Romania
3 Romanian Academy, Filial of Iasi, Collective of Geography, 18 Carol I, 700506 Iasi, Romania
4 Academy of Romanian Scientists, 54 Splaiul Independentei, RO-050094 Bucharest, Romania
Abstract
In this study, the sorptive removal of Cd(II) ions from aqueous solution onto mustard biomass was investigated. The sorption process was studied as a function of initial solution pH, biomass dosage, initial metal ion concentration and contact time, at room temperature (25 . 0.5 .C), in batch system. About 5.0 g/L of mustard biomass was found to be enough to remove 80 % of 46.11 mg/L Cd(II) from 25 mL aqueous solution in 30 min of contact time, at initial solution pH of 5.5, considered to be optimum. The sorption kinetics data could be described by the pseudo-second order kinetic model, while the equilibrium data were well fitted using the Langmuir isotherm model. A maximum sorption capacity of 33.56 mg Cd(II)/g was obtained. In order to increase the sorption capacity of mustard biomass for Cd(II) ions, a simple chemical treatment was used. After alkaline treatment enhance of sorption capacity with 55 % for Cd(II) ions was obtained. The results of this study indicate that the mustard biomass has potential to become an effective and economical sorbent for the removal of Cd(II) ions from industrial waste effluents.
Keywords
alkaline treatment; Cd(II) ions; mustard biomass; sorptive removal