Kinetics of endosulfan sorption on to wood charcoal |
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Authors: | Y Sudhakar A K Dikshit |
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Institution: | Department of Civil Engineering , Indian Institute of Technology , Kharagpur, 721 302, India |
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Abstract: | Abstract A part of the research work conducted to evaluate the efficiency of a locally available low cost wood charcoal in removing endosulfan, an organochlorine insecticide, has been presented here in this paper. In the batch experiments conducted at 1 mg/I initial concentration of endosulfan, it was found that wood charcoal could remove endosulfan from water up to 95%. Kinetic profiles were developed for various conditions and they followed second order kinetic reactions. Adsorption equilibrium time was determined by two different approaches namely rough estimate and 2% slope criteria. The equilibrium time was found to be 5 hrs. Forward, reverse, and overall reaction rate constants were determined by approximating the kinetic data to the first order reversible kinetic model. Rate constants increased with increasing initial concentration of endosulfan. Rate limiting process was determined by using kinetics data and further confirmed by the multiple interruption test. Pore and film diffusion coefficients were determined from the half time equations. Film diffusion appeared to be the rate limiting which was further supported by the multiple interruption test. |
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Keywords: | Adsorption diffusion coefficient endosulfan equilibrium time order of reaction pesticides rate of reaction rate limiting process |
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