Liquid-Phase Adsorption of Phenol using Modified Rice Husks: Kinetics, Isotherms and Thermodynamics Studies


  • Amina Abdel Meguid Attia National Research Center
  • Sohair Abdel Aziz Sayed Ahmed National Research Centre
  • Laila Boules Khalil National Research Centre


Rice husk, phenol, KMnO4, adsorption


The use of low-cost and ecofriendly adsorbents was investigated as an ideal alternative to the current expensive methods of removing organic compound from aqueous solutions. Modified rice husks MRI, MR2 and MR3 prepared by chemical oxidation with different concentration of KMnO4 (0.05, 0.08 and 0.1M) were used as an adsorbent for the removal of phenol from aqueous solutions. Batch kinetics and isotherm studies were carried out to evaluate the effect of adsorbent dose, pH, contact time, initial phenol concentration. Four simplified adsorption isotherms including Langmuir, Freundlich, D-R and Redlich Peterson were selected to follow the adsorption process. The pseudo-second-order model described the adsorption kinetics well. Intra-particle diffusion process was identified the main mechanism controlling the rate of phenol sorption. Thermodynamics parameters showed that the adsorption of phenol onto modified rice husk was spontaneous and exothermic. The modified rice husks were characterized using TG, DTA, SEM and FT-IR spectroscopy. The study conducted that modified rice husk can be a good adsorbent for removing phenol from aqueous solution.



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How to Cite

Attia, A. A. M., Sayed Ahmed, S. A. A., & Khalil, L. B. (2015). Liquid-Phase Adsorption of Phenol using Modified Rice Husks: Kinetics, Isotherms and Thermodynamics Studies. Asian Journal of Applied Sciences, 3(4). Retrieved from




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