Thermodynamic Study For Removing Of Crystal Violet Dye On Iraqi Porcelanite Rocks Powder

Abstract

Natural Iraqi Porcelanite Rocks powder are better adsorbents due to better functionality, surface area, employed for the adsorption of crystal violet (cv) dye from aqueous media. Crystal violet is used as adye in cotton ;silk and printing ink, crystal violet (cv) dye is a water - soluble, toxic, recalcitrant organic dye that cause several health problems and environment pollution. This study involves the adsorption of crystal violet (cv) dye adsorbed from solution on the Iraqi Porcelanite Rocks powder surface was characterized by numerous techniques AFM. The Iraqi Porcelanite Rocks powder showed promising adsorption ability for Crystal violet dye. Batch experiments were designated to determine the effect of PH, dye concentration, adsorbent dose, temperature change and contact time in dye removal. Process variables were optimized and maximum dye adsorption of 31.38 mg/g was achieved at PH 8, 0.02 g adsorbent dose, 20 min. contact time, 25 for dye initial concentration of 30 mg/L. The isothermal data obtained using batch adsorption technique were fitted using Langmuir, Freundlich and Timken equation and it was found that the experimental data is well described by Freundlich isotherm model. Different thermodynamic parameters have shown natural Gibbs free energy (ΔG) of the system showed increasing spontaneity with temperature while positive entropy value (ΔS) implied random disorder of molecules featured at solution/solid interfase. Positive enthalpy value (ΔH) confirmed endotherimic nature of this adsorption process.