African Journal of
Environmental Science and Technology

  • Abbreviation: Afr. J. Environ. Sci. Technol.
  • Language: English
  • ISSN: 1996-0786
  • DOI: 10.5897/AJEST
  • Start Year: 2007
  • Published Articles: 1071

Full Length Research Paper

Diffusion coefficients of Grewia spp. biopolymers in water

Ndi. K. Sylvere
  • Ndi. K. Sylvere
  • Industrial Filtration and Water Treatment (Chem. Eng.) Group, Department of Process Engineering, ENSAI, University of Ngaoundere, P.O. Box: 455, Ngaoundere, Cameroon.
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Kofa G. Patrice
  • Kofa G. Patrice
  • Industrial Filtration and Water Treatment (Chem. Eng.) Group, Department of Process Engineering, ENSAI, University of Ngaoundere, P.O. Box: 455, Ngaoundere, Cameroon.
  • Google Scholar
Kameni Ngounou M. Bernard
  • Kameni Ngounou M. Bernard
  • Industrial Filtration and Water Treatment (Chem. Eng.) Group, Department of Process Engineering, ENSAI, University of Ngaoundere, P.O. Box: 455, Ngaoundere, Cameroon.
  • Google Scholar
Ngnié N. Patricia
  • Ngnié N. Patricia
  • Industrial Filtration and Water Treatment (Chem. Eng.) Group, Department of Process Engineering, ENSAI, University of Ngaoundere, P.O. Box: 455, Ngaoundere, Cameroon.
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Kayem G. Joseph
  • Kayem G. Joseph
  • Industrial Filtration and Water Treatment (Chem. Eng.) Group, Department of Process Engineering, ENSAI, University of Ngaoundere, P.O. Box: 455, Ngaoundere, Cameroon.
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  •  Received: 04 October 2014
  •  Accepted: 09 December 2014
  •  Published: 30 April 2015

Abstract

Diffusion coefficients of biopolymers extracted from Grewia spp. barks in water were studied under various physicochemical conditions. Extractions were carried out on barks of 3 cm in length at different pH (5-9), temperature (25-50°C) and ionic strength (10-3-10-2M), using CaCl2 and NaCl as background electrolytes. Factorial experimental plan design was used and diffusion coefficients were determined using second law of Fick equation, with linear and logarithmic approximation. Obtained results show that diffusion coefficients of Grewia spp. biopolymers are in the range of 9.78458E-06±1.6462E-08 cm2/min, and are not significantly influenced¶not soignificantly influence by the pH, the ionic strength and the temperature. Maximum diffusion was obtained with CaCl2 at high ionic strength. Both linear and logarithmic approximations were found to be suitable for diffusion coefficients and were dependent on the background electrolyte used.
 
Key words: Biopolymers, diffusion coefficient, Grewia.