الفهرس 
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Abstract
Equilibrium, mass transfer and kinetic processes during the adsorption of Methylene Blue (MB), and Acid Red 97 (AR97) onto Yemen clay have been studied.
The equilibrium results show that solution temperature and particle size range have an important roles in adsorption process. The Freundlich isotherm fitted the equilibrium data better than Langmuir, Temkin, Redlich-Peterson, and Sips isotherms.
Kinetic results obtained using mechanical and gas stirring adsorbers have been analyzed using external mass transfer and intraparticle diffusion models as mass transfer models and pseudo first-order, pseudo second-order, and Elovich as kinetic models. Elovich model fitted the experimental data better than other two kinetic models for all systems except for the adsorption of AR97 onto clay using gas stirring column, the experimental results followed pseudo second-order model.
The experimental results indicated that Yemen natural clay was determined to be a high effective and low-cost adsorbent for treatment of coloured effluents and can be used as alternative of high cost commercial activated carbon.