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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/1967
Title: Adsorption of benzaldehyde on granular activated carbon: Kinetics, equilibrium, and thermodynamic
Authors: Rajoriya R.K.
Prasad, Basheshwar Rajendra
Mishra I.M.
Wasewar K.L.
Published in: Chemical and Biochemical Engineering Quarterly
Abstract: Adsorption isotherms of benzaldehyde from aqueous solutions onto granular activated carbon have been determined and studied the effect of dosage of granular activated carbon, contact time, and temperature on adsorption. Optimum conditions for benzaldehyde removal were found adsorbent dose ? ?4 g 1-1 of solution and equilibrium time f ? 4 h. Percent removal of benzaldehyde increases with the increase in adsorbent dose for activated carbon, however, it decreases with increase in benzaldehyde mass concentration. Adsorption capacity of activated carbon for benzaldehyde removal decreases with increase in temperature, the adsorbent showing the exothermic nature of adsorption. The adsorption of benzaldehyde by granular activated carbon followed pseudo-second order kinetics. Diffusion is not the only rate-controlling step. Adsorption equilibrium data were analyzed by Langmuir, Frendlich and Temkin isotherm equation using regression analysis. Temkin found to best represent the data for benzaldehyde adsorption onto granular activated carbon. Value of the change in entropy (?So) and heat of adsorption (?H o) for benzaldehyde adsorption on activated carbon were negative. The high negative value of change in Gibbs free energy (?Go) indicates the feasible and spontaneous adsorption of benzaldehyde on granular activated carbon.
Citation: Chemical and Biochemical Engineering Quarterly (2007), 21(3): 219-226
URI: http://repository.iitr.ac.in/handle/123456789/1967
Issue Date: 2007
Keywords: Activated granular carbon
Adsorption
Benzaldehyde
Equilibrium
Kinetics
Thermodynamics
ISSN: 3529568
Author Scopus IDs: 24464566500
15838004000
23668474600
6506156879
Author Affiliations: Rajoriya, R.K., Chemical Engineering Department, Indian Institute of Technology (IIT), Roorkee - 247667, Uttarakhand, India
Prasad, B., Chemical Engineering Department, Indian Institute of Technology (IIT), Roorkee - 247667, Uttarakhand, India
Mishra, I.M., Chemical Engineering Department, Indian Institute of Technology (IIT), Roorkee - 247667, Uttarakhand, India
Wasewar, K.L., Chemical Engineering Department, Indian Institute of Technology (IIT), Roorkee - 247667, Uttarakhand, India
Corresponding Author: Wasewar, K. L.; Chemical Engineering Department, Indian Institute of Technology (IIT), Roorkee - 247667, Uttarakhand, India; email: k_wasewar@rediffmail.com
Appears in Collections:Journal Publications [CH]

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