Biosorption of Co(II) by immobilised Pleurotus ostreatus
Cobalt biosorption by Pleurotus ostreatus immobilised in calcium alginate has been studied. The experimental results showed that immobilised Pleurotus ostreatus were effective for removing Co(II) from aqueous solution. Co(II) biosorption equilibrium was approached within 120 min. Pseudo second-order kinetic equation was applicable to all the sorption data over the entire time range. Intra-particle diffusion was not the only rate-limiting step. The biosorption data conformed better to Langmuir Isotherm Model than Freundlich Isotherm Model. The maximum adsorption capacity (qm) onto Pleurotus ostreatus immobilised in calcium alginate was 13.5 mg/g for Co(II). The FT?IR analysis showed that the mechanism involved in biosorption of Co(II) by Pleurotus ostreatus was mainly attributed to binding of amide I group.
Keywords: cobalt biosorption, immobilisation, kinetics, mechanism, Pleurotus ostreatus, calcium alginate, adsorption capacity