Thermodynamic Studies and camper for ability Salix acmophylla to adsorption of two dyes Cong Red and gentine violetrom aqueous solution

Abstract

The present work was concerned with Thermodynamic studies for ability Salix acmophylla adsorption of two dyes Cong Red and Gentine violet from aqueous solution were studied using UV - visible spectroscopy technique. The result obtained that the adsorption isotherms on Salixacmophylla surface were fitted by both of the Freundlich and Langmuir isotherm were of types S1and S2 according to Giles classification .From these isotherms ,the adsorption capacity increased with the increase the initial concentration .The maximum adsorption of dye Cong Red on Salix acmophylla are much higher than that of Gentine violet .The influence of the temperature and pH Values were studied so that decreased with the increased of temperature.While in aid medium increased adsorption of the dye Gentine violet in pH=4 while adsorption dye Cong Red on Salix acmophylla increase with PH=9.The effect of ionic strength has been studied and it was found that the adsorption depends on the concentration of NaCl salt( 0.1 , 0.05M) .The thermodynamic parameters were calculated.