BIOSORPTION BY BIOMASS OF Termitomyces clypeatus I: ENHANCEMENT OF HEXAVALENT CHROMIUM REMOVAL IN AQUEOUS SOLUTION BY HEAT PRETREATMENT LATA RAMRAKHIANI AND SUMAN KHOWALA
نویسندگان
چکیده
Enhanced Cr(VI) biosorption efficiency (97.09% in 24h, pH 2.0) by heat pretreatment of Termitomyces clypeatus biomass was observed as compared with that of live biomass (66.15% in 48h). The influence of different environmental parameters such as pH, biomass dose, initial Cr concentration, contact time, shake condition on biosorption by the heat treated biomass were investigated. Adsorption characteristics fitted well with Langmuir and Freundlich isotherms and obeyed both the first and the second-order kinetics. Immobilization of the biomass in magnetic sodium/calcium alginate beads increased the flexibility, mechanical stability of the biomass and biosorption efficiency remained unchanged. Desorption studies using 0.05N NaOH showed 36.4% chromium recovery. Heat treated biomass was cost effective, ecofriendly and showed efficient chromium removal with no risk of contamination during biosorption process.
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