Volume 10, Issue 1, January 2015, Pages 101–108
Constant TCHEKA1, Massaï HAROUNA2, S. Symphorien FADEUNE GAINEUNBO3, and Mohamed Mbarki4
1 Laboratory of Physical and Theoretical Chemistry, Department of Inorganic Chemistry, Faculty of Science, P.O. Box 812, Yaoundé, Cameroon
2 Department of Chemistry, Faculty of Science, University of Ngaoundéré, P.O. Box 454, Ngaoundéré, Cameroon
3 Laboratory of Physical and Theoretical Chemistry, Department of Inorganic Chemistry, Faculty of Science, P.O. Box 812, Yaoundé, Cameroon
4 Department of chemistry and environment, Sultan Moulay Slimane University, Faculty of Science and Technology, Transdisciplinary Team of Analytical Science for Sustainable Development, PB 523, Beni Mellal, Morocco
Original language: English
Copyright © 2015 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
A carbonaceous adsorbent prepared from hulls of Vitexdoniana by H3PO4 treatment was investigated for its efficiency in methylene blue (MB) and of methyl orange (MO) adsorption in aqueous solution. The characterizations of materials are carried out by Fourier Transform Infrared Spectroscopy (FTIR), pH (6.2) and the iodine index measurement which showed that our powder activated carbon is primarily made up of meso and macro pores. The influence of major parameters governing the efficiency of the process such as, solution pH, sorbent dose, initial concentration, ionic strength and contact time on the removal process was explored. The Times of balance of adsorption are obtained to 40 and 50 minutes respectively for the MB and MO. The outputs of elimination of the molecules of the MB and MO to this balance are respectively to 85.92% and 46.60%. The variation of pH showed that the maximum of adsorption of the MB is with pH=10 and for MO, the maximum of adsorption is with pH=3. Four theoretical adsorption isotherms namely Langmuir, Freundlich, Temkin and Dubinin -Radushkevic were used to describe the experimental results. The models of Temkin and Dubinin- Radushkevic describe better the adsorption of the methylene blue. The model of Langmuir is that which corroborates, better than others, with the experimental results in the case of methyl orange. The reaction of adsorption of the two dyes is endothermic and the mechanism of adsorption is chemical. The pseudo-first order kinetic models, pseudo second order, Elovich and intra particulate have been applied to the experimental data and that which is appropriate is the kinetic model of pseudo second order.
Author Keywords: adsorption, kinetic, Vitexdoniana, dye, methylene blue, methyl orange, activated carbon.
Constant TCHEKA1, Massaï HAROUNA2, S. Symphorien FADEUNE GAINEUNBO3, and Mohamed Mbarki4
1 Laboratory of Physical and Theoretical Chemistry, Department of Inorganic Chemistry, Faculty of Science, P.O. Box 812, Yaoundé, Cameroon
2 Department of Chemistry, Faculty of Science, University of Ngaoundéré, P.O. Box 454, Ngaoundéré, Cameroon
3 Laboratory of Physical and Theoretical Chemistry, Department of Inorganic Chemistry, Faculty of Science, P.O. Box 812, Yaoundé, Cameroon
4 Department of chemistry and environment, Sultan Moulay Slimane University, Faculty of Science and Technology, Transdisciplinary Team of Analytical Science for Sustainable Development, PB 523, Beni Mellal, Morocco
Original language: English
Copyright © 2015 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
A carbonaceous adsorbent prepared from hulls of Vitexdoniana by H3PO4 treatment was investigated for its efficiency in methylene blue (MB) and of methyl orange (MO) adsorption in aqueous solution. The characterizations of materials are carried out by Fourier Transform Infrared Spectroscopy (FTIR), pH (6.2) and the iodine index measurement which showed that our powder activated carbon is primarily made up of meso and macro pores. The influence of major parameters governing the efficiency of the process such as, solution pH, sorbent dose, initial concentration, ionic strength and contact time on the removal process was explored. The Times of balance of adsorption are obtained to 40 and 50 minutes respectively for the MB and MO. The outputs of elimination of the molecules of the MB and MO to this balance are respectively to 85.92% and 46.60%. The variation of pH showed that the maximum of adsorption of the MB is with pH=10 and for MO, the maximum of adsorption is with pH=3. Four theoretical adsorption isotherms namely Langmuir, Freundlich, Temkin and Dubinin -Radushkevic were used to describe the experimental results. The models of Temkin and Dubinin- Radushkevic describe better the adsorption of the methylene blue. The model of Langmuir is that which corroborates, better than others, with the experimental results in the case of methyl orange. The reaction of adsorption of the two dyes is endothermic and the mechanism of adsorption is chemical. The pseudo-first order kinetic models, pseudo second order, Elovich and intra particulate have been applied to the experimental data and that which is appropriate is the kinetic model of pseudo second order.
Author Keywords: adsorption, kinetic, Vitexdoniana, dye, methylene blue, methyl orange, activated carbon.
How to Cite this Article
Constant TCHEKA, Massaï HAROUNA, S. Symphorien FADEUNE GAINEUNBO, and Mohamed Mbarki, “Kinetic and Equilibrium Studies on Adsorption of Methylene Blue and Methyl orange in Aqueous Solution onto Activated Carbon by H3PO4 Activation from the Hulls of Vitexdoniana,” International Journal of Innovation and Applied Studies, vol. 10, no. 1, pp. 101–108, January 2015.
