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Biosorption potential of Talaromayces aculeatus AMDC-14 (KF588646) as low-cost biosorbent for different dyes (Reactive Blue 13, Reactive Blue 72, Reactive Yellow 85 and Reactive Orange 13) removal from aqueous medium was studied. Experiments were performed to determine effect of initial solution pH (1-7), biosorbent dose (0.1-2.5 g L-1), contact time (15-1440 min), dye concentration (10-200 ppm), temperature (25-40 °C) onto Talaromayces aculeatus biosorption. Biosorption equilibrium data were described very well for Reactive Blue 13, Reactive Blue 72, Reactive Yellow 85 and Reactive Orange 13 by Langmuir isotherm model than Freundlich isotherm model with maximum biosorption capacities which are 32.10, 71.30, 20.67 and 31.30 mg g-1 , respectively. Biosorption of investigated dyes fitted to kinetic model of pseudo-second-order for all dyes. Gibbs free energies (ΔG°) of biosorption processes were calculated and the results indicated that all selected dyes biosorption onto Talaromayces aculeatus AMDC-14 were spontaneous in this study. And also biosorption processes had endothermic enthalpy values except Reactive Blue 72.

A B S T R A C TThe removal of nickel ions from aqueous solutions using magnesite tailing was studied in batch system. The effects of initial pH, adsorbent dosage, contact time, and temperature on nickel removal were investigated. Kinetic models were evaluated to describe the kinetics of nickel adsorption onto magnesite tailing. The adsorption kinetics conformed to the pseudo-second-order kinetic model. The Langmuir and Freundlich models were used for the analysis of adsorption equilibrium. The equilibrium data obeyed the Langmuir isotherm model. The thermodynamic parameters exhibited that the adsorption process was spontaneous and endothermic. The Fourier transform infrared spectroscopy analysis was applied to characterize the unloaded and nickel-loaded magnesite tailing. The functional groups such as hydroxyl, carbonate, silicon oxide, and iron oxide on the adsorbent surface may be responsible for nickel adsorption.