Short communication biosorption characteristics of water hyacinth (eichhornia crassipes) in the removal of nickel (II) ion under isothermal condition

This study was taken to investigate the potentiality of water hyacinth (eichhornia crassipes) as an alternative biosorbent for the removal of ni (ii) ion from aqueous solution. the optimum ph,contact time and concentration were found to be 6.0,40 min and 1.0 mg/l under isothermal condition. the biosorption of ni (ii) ion was found to decrease with increasing ph,initial concentration and contact time. results obtained were analysed with langmuir and freundlich biosorption models. the equilibrium data fitted well to the langmuir biosorption model with correlation coefficient (r2) value of 0.98. the monolayer adsorption capacity was 0.29 mg/g. the removal of ni (ii) ion from aqueous solution using water hyacinth biomass followed a monolayer biosorption.