Binary biosorption of Cadmium(II) and Nickel(II) onto planococcus sp. isolated from wastewater: Kinetics, equilibrium and thermodynamic Studies

Abstract

In this present study the effects of pH, temperature, single and dual metal ion concentrations, dose of Planococcus biomass and desorption agents on the uptake of Cd(II) and Ni(II) was measured using atomic absorption spectrophotometry. To show surface adsorption of bacteria, SEM-EDX and FTIR analysis were done before and after metals adsorption. The maximum biosorption capacity of Planococcus sp determined as 0.67, 0.48 mmol g −1 for cadmium(II) and as 0.58, 0.47 mmol g −1 for nickel(II) for single and binary ion situation. The correlation coefficient for the second-order kinetic model was 0.993. The Langmuir and Freundlich isotherm models were also applied to the equilibrium of system and data were better fitted with the Langmuir isotherm.

The Potential Efficiency of Bacillus subtilis AIK to Remove Nickel from Aqueous Solutions

“…While at 30⁰C, the increase in R% can be attributed to the fact that, at pH 9, the metal may precipitate to insoluble form which is related to the increase of bacterial accumulation in the metal [26]. It is known that the pH of the solution can impact the uptake of the metal by affecting the cell binding sites as well as the metal chemistry in the solution [27]. The decrease at a higher pH value is perhaps due to the presence of hydroxide complex and with an increase in pH value, the ligands such as carboxylate may uptake the metal ions.…”