Fast adsorption for removal of methylene blue from aqueuous solutions using of local clay

Abstract

In the present work we are interested in the study of the adsorption of a methylene blue cationic dye (BM) on natural material such as local clay (CM). For this reason, we carried out a parametric study of adsorption by studying the effect of several important parameters on the decolorizing power of the material used, in particular: contact time, adsorbent concentration, adsorbent dose, pH and temperature. A kinetic study was performed and kinetic models were applied to experimental results such as pseudo first order and pseudo second order. A modeling of the isotherms was carried out by applying known models such as Langmuir and Freundlich. The decolorization percentage was 92 %. Kinetic studies of dye on MB carried out the pseudo-second order at different dye concentration values. The Langmuir model describes satisfactory adsorption on the CM. Thermodynamic studies indicated that dye adsorption process by CM was spontaneous and endothermic in nature. On the other hand, different techniques of characterization of the CM adsorbent were used such as: scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR).