Abstract
In this study, Zizphus spina-christi leaf powder was applied for the adsorption of methyl orange. The effect of different operating parameters on the Batch Process adsorption was investigated such as solution pH (2-12), effect of contact time (0-60 min.), initial dye concentration (2-20 mg/L), effect of adsorbent dosage (0-4.5 g) and effect of temperature (20-50ᵒC). The results show a maximum removal rate and adsorption capacity (%R= 23.146, qe = 2.778 mg/g) at pH = 2 and equilibrium was reached at 40 min. The pseudo- second-order kinetics were found to be best fit for the removal process (R2 = 0.997). Different isotherm models (Langmuir, Freundlich, Dubini-Radushkevich,Temkin) were applied in this study and the adsorption process was found to fit Dubinin-Radushkevich isotherm (R2 = 0.970). The thermodynamic parameters: ∆Gº, ∆Hº, ∆Sº were also invested, the results indicate the process to be exothermic (∆Hº = -100.933 kJ/mole), non-spontaneous, and more feasible at lower operating temperatures, with a decrease in the randomness at the solid-liquid interface (∆Sº = - 0.370 kJ/mole.K)
Keywords
Adsorption, Dubinin-Radushkevich isotherm, Methyl orange, Pseudo-second-order, Thermodynamic parameters, Zizphus spina-christi leaf powder
Article Type
Article
How to Cite this Article
Mohammed, Fadya F.
(2023)
"Equilibrium, Kinetic, and Thermodynamic Study of Removing Methyl Orange Dye from Aqueous Solution Using Zizphus spina-christi Leaf Powder,"
Baghdad Science Journal: Vol. 20:
Iss.
2, Article 20.
DOI: https://doi.org/10.21123/bsj.2022.7036
