Kinetic and Thermodynamic studies of Elimination of methylene blue dye by nano clinoptilolite zeolite from aqueous solutions

Banimahd Keivani, Mohammad; Kharazmi Rahim Abadi, Navid

doi:10.66437/JNS.2410.1003.1.1.3

Kinetic and Thermodynamic studies of Elimination of methylene blue dye by nano clinoptilolite zeolite from aqueous solutions

Document Type : Original Article

Authors

Mohammad Banimahd Keivani ¹

Navid Kharazmi Rahim Abadi ²

¹ Assistant Professor, Physical Chemistry, Payame Noor University, Tehran, Iran

² BSc, Department of Chemistry, Payame Noor University, Tehran, Iran

10.66437/JNS.2410.1003.1.1.3

Abstract

In this study we investigate kinetic and thermodynamic parameters for elimination of methylene blue (MB) dye from aqueous solution by application nano clinoptilolite zeolite (NCZ). The effects of some important parameters such as kinetic and thermodynamic parameters were studied. In order to determine mechanism of adsorption processes such as chemical reaction and removal, the pseudo-first-order adsorption and the pseudo-second-order were used to examine the experimental data. It was found that second-order kinetics model (r² = 0.9994) is better than first-order kinetics model (r² = 0.1688). The difference between experimental and calculated qe shows no applicability of the pseudo-first order model in predicting the kinetics of the MB adsorption onto the NCZ. The change in Gibb’s free energy (∆G⁰), the change in entropy (∆S⁰) and the change in enthalpy (∆H⁰) were also investigated and calculated for this removal. This process had some negative changes in Gibb’s free energy (∆G⁰ =-6.627 KJ) and positive in enthalpy (∆H⁰ =+45.061 KJ) and entropy (∆S⁰ =+173.54 KJ). This adsorption was an endothermic and spontaneous process.

Keywords

Nano clinoptilolite

Zeolite

Kinetic

Thermodynamic

Methylene blue