Rhodamine B adsorption on natural and modified moroccan clay with cetyltrimethylammonium bromide: Kinetics,equilibrium and thermodynamics

The use of raw and modified moroccan natural clays as adsorbent for sewage treatment was investigated for the removal availability of textile dyes from aqueous solution. for this purpose,the adsorption of rhodamine b (rb) by raw (rc) and modified clay (mc),were investigated through batch adsorption experiment. the clays were characterized by means of xrd,energy-dispersive x-ray spectroscopy (edx) and fourier transformed infrared spectroscopy (ftir). the effects of initial dye concentration,contact time,solution temperature and ph solution on kinetic parameters are discussed. the adsorption process was followed by uv-spectrophotometric technique in a specially designed adsorption cell. thermodynamic studies and adsorption isotherms langmuir,freundlich and temkin models were used to describe this phenomenon of adsorption and to obtain isotherm parameters. the results showed that sorption process was best described by the pseudo-second-order model andwhich were more favorable at higher ph. increase in temperature from 25 to 55°c of rb adsorption on both rc and mc increased,the degree of dispersion and the process was found to be physiosorptive and endothermic for mc and rc,this was obtained from the thermodynamic studies. the quantity eliminated was depended on the initial concentration,contact time,solution temperature and ph of solution. the results showed that mc can be used adequately to adsorb rb more efficiently than rc. © 2017,university of mohammed premier oujda morocco.