Study of kinetics and isotherms of biosorption nickel by Gracilaria sp

Number of methods developed for remediation of heavy metals from aqueous effluent, but generally they require high investment, operation and maintenance costs. Recently many studies have been done for exploration cost effective ways for removal of heavy metals. One of the effective technologies to remove heavy metals is to use bio-absorbents which are economical, easy to access, and conformed to environmental standards. The aim of this research was to study the biosorption level of nickel using Gracilaria sp. In this study, the batch removal of nickel (II) ions from aqueous solution under different experimental conditions using of Gracilaria was investigated. The nickel (II) uptake was dependent on initial pH, with pH 5 being the optimum value. The equilibrium data were fitted using Langmuir isotherm model. The maximum nickel sorption was attained within the first 15 min and the sorption equilibrium was reached after 120 min.