Cholestyramine as an Adsorbent for Methyl Orange from Aqueous Solution | ||||
| Benha Journal of Applied Sciences | ||||
| Article 33, Volume 5, Issue 7 part (1) - (2), October 2020, Page 209-216 PDF (413.33 K) | ||||
| Document Type: Original Research Papers | ||||
| DOI: 10.21608/bjas.2020.227331 | ||||
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| Authors | ||||
| I.M. Ghanem; G.O. El-Sayed; E.M. Kamar; H.M. Aly | ||||
| Chemistry Department, Faculty of Science, Benha University, Benha, Egypt | ||||
| Abstract | ||||
| The removal of methyl orange (MO) from aqueous solution by adsorption on cholestyramine resin was evaluated by batch mode. The experiments were performed as a function of initial dye concentration, stirring rate, ionic strength, adsorbent dosage, pH and temperature. Adsorption process was attained to the equilibrium within 40 minutes. The adsorption capacity of MO increased with increasing initial dye concentration, stirring rate, and decreased with increasing ionic strength, pH, adsorbent dosage and temperature. The experimental data were analyzed by Langmuir and Freundlich isotherm models and fitted well to Langmuir model with a value of adsorption capacity of (Qo) 200 mg/g of MO. The effect of temperature on removal capacity was examined and was found to be an exothermic process. Thermodynamic parameters such as change in free energy (∆G), enthalpy (∆H) and entropy (∆S) were determined. ΔH value was -17.85 kJ/mol confirming that adsorption was mainly physisorption. The negative values of ΔG reflected the spontaneous nature of adsorption process and the negative values of entropy change ΔS (-103.2 J/mol) imply an increase of randomness at the solid–solution interface through the adsorption at low temperatures. | ||||
| Keywords | ||||
| cholestyramine; methyl orange; adsorption; isotherm models | ||||
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