Single and Multi-component Biosorption of Copper and Zinc Ions using Microalgal Resin

Abstract

In recent years, there has been increasing interest in the use of biomass from microbialsources, particularly the microalgae, to absorb multimetal ions in the waste water.The other type of treatment like ion exchange, evaporation, precipitation, membrane separation etc.are too expensive to treat low levels of heavy metal in wastewater. This work demonstrated the biosorption of a mixture of heavy metals solution with silica gel immobilized micro algae Comparison of metal uptake in single and multi-component aqueous solutions of Cu-Zn was discussed. The results suggested that there should exist a competitive adsorption for the binary mixture solution as the adsorption capacity for the primary heavy metal often dropped with the introduction of the secondary heavy metal. The adsorption capacity was also found to decrease for the cases of binary adsorption. The biosorption equilibrium data obeyed Langmuir and Freundlich model in the concentration ranges studied.The preference of investigated biosorbent for metals is as follows Cu>Zn. The sorption processes were found to be slower in multi-component than those in the single-component metal solutions. Concerning copper, and zinc, no significant removal efficiency could be noticed between single and multi-component aqueous metal solutions in the presence of NO 3 and SO 4 anions. On the contrary, presence of chloride ions significantly decreased efficiency of metal biosorption.. The presence of Ca and Mg ion did not affect the adsorption of Cu ion whereas these ions considerably affect the adsorption of Zn ion. This finding is highly important for the design of the adsorption system and it can be used for metal uptake in waste water treatment

Competitive Adsorption of Aqueous Cd(II) and Pb(II) Solutions onto Silicas Synthesized with Saponin as Template Agent

“…The competitive adsorption of pollutants (metal ions/organic pollutants/other inorganic pollutants) from binary solutions can be characterized by applying the modified Langmuir isotherm equation introduced originally by Weber and Digiano (Table 4) [64][65][66][67].…”

Multicomponent and Competitive Sorption of Heavy Metals- Review on Significant Research and Studies

“…Non-linear Freundlich equation described the isotherm of the metal uptake. Ramsenthil and Meyyappan carried out investigation on single and multicomponent sorption of copper and zinc ions on Microalgal Resin 31 .Their investigation also suggest that there exist a competitive adsorption for the binary mixture solution. Langmuir and Freundlich model in the applied concentration ranges were adequate to describe the uptake.…”