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International Journal of Chemical Engineering
Volume 2014 (2014), Article ID 306519, 13 pages
http://dx.doi.org/10.1155/2014/306519
Research Article

Studies on Biosorption of Methylene Blue from Aqueous Solutions by Powdered Palm Tree Flower (Borassus flabellifer)

1Department of Chemical Engineering, Manipal Institute of Technology, Manipal 576104, India
2Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal 575025, India
3Department of Biotechnology, Manipal Institute of Technology, Manipal 576104, India

Received 18 September 2013; Accepted 25 November 2013; Published 2 February 2014

Academic Editor: Jean-Pierre Corriou

Copyright © 2014 M. Srinivas Kini et al. 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

Biosorption experiments were carried out for the removal of methylene blue (MB) using palm tree male flower (PTMF) as the biosorbent at various pH, temperature, biosorbent, and adsorbate concentration. The optimum pH was found to be 6.0. The kinetic data were fitted in pseudofirst-order and second-order models. The equilibrium data were well-fitted in Langmuir isotherm and the maximum equilibrium capacities of the biosorbent were found to be 143.6, 153,9, 157.3 mg/g at 303, 313, and 323 K, respectively. Thermodynamic data for the adsorption system indicated spontaneous and endothermic process. The enthalpy and entropy values for adsorption were obtained as 15.06 KJ/mol and 0.129 KJ/mol K, respectively, in the temperature range of 303–323 K. A mathematical model for MB transported by molecular diffusion from the bulk of the solution to the surface of PTMF was derived and the values of liquid phase diffusivity and external mass transfer coefficient were estimated.