Abstract
Biosorption of Cd(II) ions from aqueous solutions by native and dried Oscillatoria sp. Cyanobacterium biomass was investigated in the batch mode. The Oscillatoria sp. was prepared from Molecular and Cell Laboratory of University of Mazandaran and grown in BG-11 medium. A comparison of Cd(II) adsorption properties of dried with native Oscillatoria sp. biomass was made, the dried one showed a higher biosorption capacity and faster kinetic. The influence of solution pH, contact time, biomass concentration, initial metal ion concentration, and presence of coions using dried Oscillatoria sp. biomass as well as pretreatment on the biosorption capacity of the biomass were studied. Various pretreatments of Oscillatoria sp. increased biosorption of Cd(II) at pH 7 in comparison with native biomass. However, heating at 100°C in a water bath showed significant improvement in Cd(II) biosorption capacity. The experimental biosorption data was well fitted to the Freundlich model compared to the Langmuir model, and the amount of Cd(II) removed from solution increased with increasing Cd(II) concentration. In addition, the dried biomass was investigated for Cd(II) removal from the simulated real sample containing about 14 mg/l Cd(II) at pH 7, under the same experimental condition.
Highlights
Heavy metal pollution in the aquatic system is one of the most important environmental problems today
Phosphate groups of lipopolysaccharides (LPSs) and phospholipids present in outer membrane begin to deprotonate around pH 7 and pH 5 is the pKa range of carboxyl groups so this suggests that these species probably have an important role in cadmium uptake by native biomass for dried biomass, phosphate groups play a main role in Cd(II) uptake [9, 13]
The goal of this work was to explore the potential use of Oscillatoria sp. biomass as a low-cost sorbent for the removal of Cd(II) heavy metal ion from aqueous solutions
Summary
Heavy metal pollution in the aquatic system is one of the most important environmental problems today. They impose serious health risks via their accumulation in living tissues throughout the food chain. Sources of Cd include wastes from Cd-based batteries, incinerators, and runoff from agricultural soils where phosphate fertilizers are used, since Cd is a common impurity in phosphate fertilizers [2]. It accumulates mainly in the kidney and liver and high concentrations have been found to lead to chronic kidney dysfunction. It has been found to be toxic to fish and other aquatic organisms
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