Removal of Endosulfan from Water Using Wood Charcoal—Adsorption and Desorption
Publication: Journal of Environmental Engineering
Volume 134, Issue 2
Abstract
Endosulfan, one of the most widely used pesticides in various sectors including agriculture, has been reported posing a threat to the ecology as well as to the environment. Contamination of groundwater and surface water sources with various pesticides is well documented, and this problem is prominent, particularly in rural areas. In the present study, efforts are made to remove endosulfan from water using wood charcoal, a local and low cost adsorbent. It gave removal efficiency of more than 90%. Equilibrium time was found to be around . Wood charcoal showed an uptake capacity of with initial endosulfan concentration in the range of and for the range of . Langmuir isotherm gave a better prediction of adsorption capacity than the Freundlich. The Langmuir isotherm fit also gave a better correlation with the experimental data. In the desorption study carried out, 10% solutions of acetone, methanol, acetic acid, saturated EDTA solution, and distilled water were used as eluents. Ten percent methanol solution was found performing well with an adsorbent regeneration of more than 80% after four cycles of adsorption desorption. Desorption was found to follow a zero order equation in the case of 10% solutions of both acetone and methanol.
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Acknowledgments
This research work was carried out by the writers at the Department of Civil Engineering, Indian Institute of Technology (IIT), Kharagpur, India. The writers would like to thank M/s Vijayalaxmi Insecticides and Pesticides Limited, Ethakota, A.P., India for providing technical grade endosulfan for undertaking the research outlined in the present paper. The writers are thankful to the anonymous reviewers of the ASCE Journal of Environmental Engineering for their valuable comments and suggestions in revising this manuscript.
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Published In
Journal of Environmental Engineering
Volume 134 • Issue 2 • February 2008
Pages: 102 - 109
Copyright
© 2008 ASCE.
History
Received: Mar 21, 2006
Accepted: Jun 15, 2007
Published online: Feb 1, 2008
Published in print: Feb 2008
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