A study of adsorption of crystal violet from aqueous solution on kaolin

الملخص EN

This study is concerned with the adsorption of Crystal violet from solution on the surface of kaolin.

UV-spectrophotometric technique has been used to produce quantitative adsorption data at different conditions of contact time, ionic strength, pH and temperature.

The calculated data were in accordance with Freundlich equation and the adsorption isotherms are of S-curve type according to Giles classification.

The results obtained show that adsorption process follows the first order rate expression.

The adsorption phenomenon was examined as a function of temperature (20, 30, 55 oC).

The extent of adsorption of Crystal violet on the Kaolin was found to increase with increasing temperature (endothermic process).

The basic thermodynamic functions have also been calculated.

The amount of dye adsorbed on the clay at different pH values showed an increase in the following order pH 7 > 8.1 > 10.5 > 11.9.

The adsorption process is affected by the electrolyte concentration.

The results indicated an decrease in adsorption of crystal violet in the presence of sodium hydrochloride.