Removal of chromium(VI) ions from synthetic
solutions by the fungus Penicillium canescens
canescens has demonstrated the ability to bind high amount of chromium(VI) from
aqueous solutions. Cr(VI) adsorption capacity increases with the time during the first 4h
and then levels off toward the equilibrium adsorption capacity. Biosorption of Cr(VI) ions
reached equilibrium in 4h. Cr(VI) ions binding Penicillium canescens was clearly pH
dependent. Cr(VI) loading capacity increased with increasing pH under acidic conditions,
presumably as a function of Cr(VI) speciation and due to the H+ competition at
same binding sites. The adsorption of Cr(VI) ions reached a plateau value at around pH
6.0. The maximum adsorption capacity of Cr(VI) ions onto the fungal biomass was 34.8mg/g.
Elution of Cr(VI) ions was performed using 0.5M HCl. The fungus Penicillium canescens
could be used for six cycles for biosorption.