Eqilibrium and kinetic studies of chromium by green marine algae- ulva fasciata

Biosorption of chromium ion from aqueous solution by dead Ulva fasiciata algae has been studied by using batch adsorption technique. The biosorption studies were determined as a function of contact time, pH, initial metal ion concentration, biosorbent size and biosorbent dosage. The equilibrium metal uptake was increased and percentage biosorption was decreased with an increase in the metal ion concentration and particle size of biosorbent. The maximum chromium biosorption occurred at pH 5 and percentage biosorption increases with increase in the biosorbent dosage. Biosorption isothermal data could be well interpreted by the Langmuir model followed by Freundlich model. The kinetic experimental data was properly correlated with the second-order kinetic model.