Abstract
Present research discussed the utilization of granular activated carbon (GAC) as an adsorbent for Reactive black 5 (RB5) removal from aqueous solution. Batch adsorption experiments were carried to evaluate the influence of pH, adsorbent dosage, contact time, initial dye concentration and temperature. The equilibrium data were analyzed using the Langmuir and Freundlich isotherm models. Experimental data were best represented by the Langmuir isotherm model. The maximum monolayer adsorption capacity of RB5 onto GAC was found to be 32.02 ㎎/g. The pseudo-second-order kinetic model adequately described the kinetic data. Thermodynamic parameters (Δ Go, ΔHo and ΔSo) suggest that the adsorption process was spontaneous and endothermic in nature. Results in this study suggested that GAC was a suitable material for the removal of RB5 in aqueous solution.
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