journal of al-qadisiyah for pure science(quarterly)

Abstract

This study is concerned with the adsorption of Crystal violet from solution on the surface of polyester. visible-spectrophotometric technique has been used to produce quantitative adsorption data at different conditions of contact time, ionic strength and temperature.
The adsorption isotherms are of S-curve type according to Giles classification. Adsorption follows the first order rate expression and Freundlich isotherm n value was found to be 2.22, representing favorable adsorption.
The adsorption phenomenon was examined as a function of temperature (10, 25, 30 oC). The extent of adsorption of Crystal violet on the Polyester was found to increase with increasing temperature (endothermic process). The basic thermodynamic functions have also been calculated.
The adsorption process is affected by the electrolyte concentration. The results indicated a decrease in adsorption of crystal violet in the presence of sodium chloride.