MODEL KESETIMBANGAN ADSORPSI Cr DENGAN RUMPUT LAUT

The negative effect of industries growth is their waste that generates contamination to environment. Cr in water above the concentration’s limit is one kind of the waste. The adsortion of Cr from aqueous solutions by algae biomass was studied. The aim of this research was to find the exact adsorption isotherm model to predict the single system adsorption by algae biomass. The batch sorption experiments was carried out in a stirred reactor equipped by thermometer, electric heater and condensor. Weighted amounts (15 to 20 g) of algae were intoduced into the reactor, to which 250 ml of Cr solution were added. The amount of Cr accumulated on algae was calculated as the difference between rhe amount present in control experiments and that remaining in solution after equilibrium with biomass After the equlibrium was attained, the Cr concentration was analized using AAS. The variables, observed in this experiment were the temperature and pH of the solution. Three adsorption isotherm models, namely Henry isotherm model, Freundlich isotherm model and Langmuir isotherm model were fitted to the experimental data. The result got Freundlich isotherm model which had least average relative error. Keywords : Algae,Adsorption, Isotherm mode