Keywords: biosorption, lead (II), immobilised fungal biomass, loofa sponge, Phanerochaete chrysosporium, equilibrium, kinetics, kinetic modelling, metal removal, heavy metals, wastewater treatment, water pollution
Biosorption of lead(II) by free and immobilised fungal biomass of Phanerochaete chrysosporium: a comparative study
An efficient metal biosorbent was developed by immobilising fungal biomass within matrix of loofa sponge (FBILS). At biosorption equilibrium FBILS removed 137 mg Pb(II) g-1, which was 24.3% greater than 110 mg Pb(II) g−1 free fungal biomass. The equilibrium biosorption data fitted well the Langmuir model. The experimental data, when applied to the pseudo-first and second-order kinetic models, followed the second-order with r² 0.996. Metal desorption from the Pb(II)-laden FBILS with 50 mM HCl was 99%, and the regenerated FBILS was repeatedly used in seven biosorption-desorption cycles without significant loss in biosorption capacity. The study indicated high potential of FBILS for effective removal of Pb(II) from industrial wastewater.