Biosorption Potential ofTrichoderma gamsiiBiomass for Removal of Cr(VI) from Electroplating Industrial Effluent

Abstract

The potential use of acid-treated biomass ofTrichoderma gamsiito remove hexavalent chromium ions from electroplating industrial effluent was evaluated. Electroplating industrial effluent contaminated with 5000 mg/L of Cr(VI) ions, collected from industrial estate of Gujarat, India, was mixed with acid-treated biomass ofT. gamsiiat biomass dose of 10 mg/mL. Effect of contact time and initial Cr(VI) ions was studied. The biosorption of Cr(VI) ions attained equilibrium at time interval of 240 minutes with maximum removal of 87% at preadjusted initial Cr(VI) concentration of 100 mg/L. The biosorption of Cr(VI) ions by biomass ofT. gamsiiincreased as the initial Cr(VI) ion concentration of the effluent was adjusted in increasing range of 100–500 mg/L. At 500 mg/L, initial Cr(VI) concentration, acid-treated biomass ofT. gamsiishowed maximum biosorption capacity of 44.8 mg/g biomass from electroplating effluent. The Cr(VI) biosorption data were analysed using adsorption isotherms, that is, Freundlich and Langmuir isotherm. The correlation regression coefficients (R2) and isotherm constant values show that the biosorption process follows Freundlich isotherm (R2>0.9,n>1, andKf=8.3). The kinetic study shows that biosorption of Cr(VI) ions by acid-treated biomass ofT. gamsiifollows pseudo-second-order rate of reaction at increasing concentration of Cr(VI). In conclusion, acid-treated biomass ofT. gamsiican be used as biosorbent for Cr(VI) ions removal from Cr(VI)-contaminated wastewater generated by industries.