Ganoderma lucidum and Mucor hiemalis adsorption efficiency for chromium (VI) was studies by free and immobilized biomass. Both the fungus was incubated for the uniform growth at 30oC for 2 days. The results showed that immobilized biomass were more efficient for Cr(VI) removal from the aqueous solution. The effects of biosorbent dose, Cr ion concentration, pH and contact time were investigated. On increasing Cr (Vi) concentration biosoption capacity decreases in both the cases. Adsorption of Cr (VI) ion on the free and immobilized G.lucidum and M. hiemalis showed highest values at around pH 6.0 and pH 4.0.The maximum uptake for Cr (93.27 mg/g) occurred at 20 mg/l concentration. The Langmuir, Freundlich and Dubinin–Radushkevich models have been applied and according to results Langmuir model fit better for biosorption of Cr (VI) at concentration ranges (20-150mg/l).The pseudo first order, pseudo second order kinetic and intra particle diffusion models were used to describe the time dependent adsorption of Cr(VI).
