Adsorption of Lambda Cyhalothrin onto Athi River Sediments: Apparent Thermodynamic Properties

Authors

  • S. S. Sherrif  Department of Chemistry, School of Physical Sciences, College of Biological and Physical Sciences, University of Nairobi, P.O. Box 30197-00100, Nairobi, Kenya
  • V. Madadi  Department of Chemistry, School of Physical Sciences, College of Biological and Physical Sciences, University of Nairobi, P.O. Box 30197-00100, Nairobi, Kenya

Keywords:

Lambda-Cyhalothrin, Adsorption, Sediment, Isotherm Model, and Spontaneity.

Abstract

Lambda-Cyhalothrin is extensively used in Kenya. It is effective against many vegetable pests, rice and other disease agents. The adsorption of Lambda-Cyhalothrin onto sediments of Athi River was studied using UV-visible; the results were analyzed by fitting the data into isotherm models including Freundlich and Dubinin-Radushvich (D-R) plots to understand its environmental impacts. Different masses of sediments were spiked with different concentrations of L-Cyhalothrin. The amounts of the pesticide adsorbed were determined by analyzing the difference between the UV-visible Spectrophotometer data and the initial concentrations. Various isotherm models were used to explain the adsorption characteristics but Dubinin-Radushvich (D-R) model with average R2: 0.935, 0.938 and 0.898 fitted best in this experiment followed by Freudlich model, R2: 0.783, 0.899 and 0.812 for all sediment samples, i.e., Upstream, Midstream, and Downstream, respectively. The spontaneity of the adsorption process was also realized in ΔG (Gibb’s free energy) values as predicted by Freundlich. In both models, Midstream ∆G was negative (-) showing complete spontaneous characteristics. Generally, adsorption capacities of Athi river sediments were low due to their low mineral contents and total organic Carbons including other physicochemical properties specifically, textures, Nitrogen content including temperatures and moisture contents.

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International Journal of Scientific Research in Science, Engineering and Technology

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Published

2017-06-30

Issue

Volume 3, Issue 3, May-June-2017

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Research Articles

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How to Cite

[1]
S. S. Sherrif, V. Madadi, " Adsorption of Lambda Cyhalothrin onto Athi River Sediments: Apparent Thermodynamic Properties, International Journal of Scientific Research in Science, Engineering and Technology(IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 3, Issue 3, pp.568-574 , May-June-2017.