Abstract
The current study deals with the biosorption of Acid Yellow 12 (AY 12) dye using dead fungal biomass Trichoderma harzianum. The dead fungal biomass was characterized using FTIR, XRD, TG–DTA and SEM–EDAX. Effect of various parameters on the efficiency of biosorption like pH, biosorbent dosage and temperature has also been analysed. The adsorption capacity was found to be higher at pH 4, with an initial dye concentration of 100 mg/L and biosorbent dosage of 0.4 g/L. The adsorption kinetics, isotherms and thermodynamic studies of dye adsorption onto the biomass were also investigated. The biosorption between the dye and biomass followed Freundlich adsorption isotherm. The biosorption followed pseudo-second-order kinetics. Negative value of ΔG° shows the spontaneous nature of biosorption process, and positive ΔH° reveals adsorption as an endothermic process. Since T. harzianum is a low-cost industrial by-product, it can be used as an effective novel biosorbent for the removal of textile dyes. It also acts as one of the cheap sources of biosorbent for the removal of dye Acid Yellow 12.
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