DESALINATION AND WATER TREATMENT, vol.90, pp.311-319, 2017 (SCI-Expanded)
This study was conducted on methylene blue adsorption using adsorbents obtained in different ways. These adsorbents were divided into four groups among its members. Activated carbon obtained after chemical activation, clay, industrial waste and agricultural waste constitutes this group. Adsorbents were characterized by X-ray diffractometer, scanning electron microscopy and Fourier-transform infrared spectroscopy. The adsorption of methylene blue onto adsorbents was investigated by calculating the parameters of contact time, the concentration of methylene blue and adsorbent dosage. Experimental data obtained from dye adsorption were studied by five two-parameter (Langmuir, Freundlich, Dubinin-Radushkevich, Temkin and Frumkin), five three-parameter (Redlich-Peterson, Sips, Toth, Radke-Prausnitz, Koble-Corrigan) isotherm models. The Langmuir and Freundlich model denotes a better value of correlation coefficient than other models. The amount of methylene blue adsorption at equilibrium by the adsorbents showed the following order; clay > activated carbon > fly ash > pine cone. Maximum adsorption capacity for methylene blue was calculated 250 mg g(-1) at clay.