Biosorption Of Cu Ions Research Articles

Biosorption of copper ions using rhizoplane bacterial isolates isolated from Eicchornia crassipes ((Mart.) solms) with kinetic studies

Biosorption of Cu ions from the aqueous solution was studied with Pseudomonas putida and Bacillus cereus, isolated from rhizoplane region of water hyacinth (Eichhornia crassipes) using pure culture technique. The effect of contact time (0, 4, 8, 12, 16, 20, and 24 h), pH (3, 5, 7, and 9), temperature (25, 37, and 45°C), and initial concentrations of Cu ions (50–1500 mg l−1) on biosorption was investigated in batch systems. Better amount of biosorption of Cu ions (500 mg l−1) from the tested biosorbents was found to be 84.8% by P. putida and 83.8% by B. cereus at pH 7. The biosorbed Cu ions by P. putida and B. cereus were 420 and 415 mg l−1, respectively, at 500 mg l−1 of Cu ion concentration. The results of pseudo-second-order kinetics were considered as the most appropriate model which predicted the biosorption capacity of both the bacterial isolates with comparison to the experimental results. Langmuir and Freundlich isotherms were used to evaluate the experimental data and their constants were derived. From the data analysis, Freundlich isotherm was fitted well followed by Langmuir isotherm model.

Uptake of copper ions from aqueous solutions by Bacillus strain isolated from desert soil

Biosorption of copper (Cu) ions from aqueous solutions has been studied in a batch system using a Bacillus species AEJ-89 isolated from Maranjab desert soil. The optimum conditions of biosorption were determined by investigating the initial pH, contact time, and the initial concentrations of metal ions at constant temperature (25°C). The maximum biosorption of Cu ions was observed at pH 5.0±0.1. Biosorption equilibrium times for Cu (II) ions were observed in 30min. The maximum biosorption capacities of Cu (II) ions on Bacillus species AEJ-89 were determined to be 0.48mmolg(-1) at 200mgl(-1) concentration. The experimental adsorption data were fitted to Langmuir isotherm model. The interactions between metal ions and functional groups on the cell wall surface of the biomass were confirmed by Fourier transform infrared spectroscopy analysis. Cu (II) ions were removed from metal-laden biomass after desorption treatments by the addition of different desorbing solutions. The results indicated that the bacterial isolate Bacillus species AEJ-89 is a suitable biosorbent for the removal of Cu (II) ions from aqueous solutions.