Abstract
At present study, multi-walled carbon nanotubes were used as an adsorbent for Reactive Black 5 (RB5) removal from aqueous solutions. The influence of important parameters including initial pH, concentration of dye, contact time, adsorbent dosage, and temperature has been investigated in order to find the optimum adsorption conditions. The results show that all the parameters have a strong effect on the adsorption of RB5 onto adsorbent. Adsorption kinetics was best described by the pseudo-second-order model. In addition, equilibrium data were better represented by Freundlich isotherm among Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich equilibrium isotherm models. The negative values of free-energy change confirmed the feasibility of the process and the spontaneous nature of adsorption. Furthermore, from the magnitude of ΔH, the process was found to be endothermic physisorption.
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