DESALINATION AND WATER TREATMENT, cilt.70, ss.134-138, 2017 (SCI-Expanded)
Adsorption has many superior properties compared with other techniques for wastewater treatment. Activated carbon has been widely used as a versatile adsorbent with optimal sorption properties for the adsorption of chemical species from their aqueous solutions. One of the main drawbacks of the adsorption process in terms of sustainability is the difficulty of regeneration of treated activated carbon or the production of relatively unstable secondary wastes with waste disposal processes based on adsorption. Moreover, the elucidation of the mechanism of adsorption-desorption is extremely important in terms of regeneration or reuse of adsorbents and designing a sustainable adsorption systems. In this study, it has been aimed the examination of adsorption-desorption behavior of an anionic textile dye (Remazol Brilliant Yellow 3GL) from the aqueous solution on powdered activated carbon using of the corresponding experimental isotherm data together with their mathematical modeling. Experimental isotherms indicate that the adsorption and desorption of the anionic dye on activated carbon took place through the different pathways and exhibited the hysteresis lobes, which are similar to that of gas-solid systems. Also, it was determined that at low equilibrium dye concentrations, the adsorption and desorption pathways overlapped, and the shape of lobes changed with increasing temperature.