The adsorption of Malachite Green (MG) cationic dye on Al-Hussainiyat clay was first studied in a batch system for various dye
concentrations. The adsorption was studied as a function of contact time, adsorbent dose, pH, and temperature under batch adsorption
technique. The concentration of the solution before and after adsorption was measured spectrophotometrically .The equilibrium data fit
with Langmuir and Freundlich models of adsorption and the linear regression coefficient R2 was used to elucidate the best fitting isotherm
model. Different thermodynamic parameters such as Gibb’s free energy, enthalpy and entropy of the on-going adsorption process have also
been evaluated. The thermodynamic analyses of the dye adsorption on Al-Hussainiyat clay indicated that the system was endothermic in
nature .
Key words: adsorption, malachite green, Langmuir model, Freundlich model, thermodynamic, clay adsorbent
|
