Document Type : Research Article
Authors
1 Department of Chemistry, College of Science, University of Kerbala, Karbala, Iraq
2 Al-Zahraa Center for Medical and Pharmaceutical Research Sciences (ZCMRS), Al-Zahraa University for Women, Karbala, Iraq.
3 2Al-Zahraa Center for Medical and Pharmaceutical Research Sciences (ZCMRS), Al-Zahraa University for Women, Karbala, Iraq.
Abstract
The optimum conditions for removal (adsorption) of carmosine dye on the CuFe2O4 NP surface at pH 4, 50°C, an adsorbent dosage of 0.1 g, a dye concentration of 5 mg/L and a contact period of 30 minutes were done. The maximum efficiency of dye removal demonstrates about 99 % at 50°C and pH equal to 4 that due to the acidic natural of this dye. Based on kinetic model, the order of adsorption of dye on CuFe2O4 NP surface was found to be Pseudo-Second Order. Furthermore, as a result of the thermodynamic analysis, negative values of Gibbs Free Energy change and positive values of enthalpy change indicated that the adsorption method took place spontaneously with an endothermically. The enthalpy change value is 51.35308 kJ mol-1 that proved the adsorption kind is chemical adsorption. The activation energy of adsorption for this dye on the CuFe2O4 NP surface is obtained as a negative value because of the reaction occurs in multi-steps, which depending on the found two various charges on CuFe2O4 NP surface : Cu2+ and Fe3+. The suggested binding mechanism of dye on CuFe2O4 NP surface was performed.
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