Thermodynamic Study of Adsorption of Azure Dyes on Iraqi Porcelanite Rocks

Abstract

Removal of Azure dyes, A, B, and C have been carried out by using Iraqi Porcelanite rocks as an adsorbent . A series of experiments were undertaken in a batch adsorption technique to access the effect of the process variable i.e.  contact time , initial pH , adsorbent dose and temperature. The removal data have been analyzed using Langmuir and Freundlich models of adsorption at various temperature varying from  298to 328 K .Thermodynamic parameters such as change in free energy (?G) the enthalpy (?H) and the entropy (?S) were also evaluated. The overall adsorption process of Azure A, B, and C dyes onto porcelanite rocks were spontaneouse, exothermic, and physic sorption.

Keyword: Porcelanite Rocks, Organic dyes Azure A, B and C, Adsorption  isotherm.