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Nitrate adsorption on clay kaolin: batch tests

Mohsenipour, M. and Shahid, S. and Ebrahimi, K. (2015) Nitrate adsorption on clay kaolin: batch tests. Journal of Chemistry, 2015 . ISSN 2090-9063

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Official URL: http://dx.doi.org/10.1155/2015/397069

Abstract

Soils possessing kaolin, gibbsite, goethite, and hematite particles have been found to have a natural capacity to attenuate pollution in aqueous phase. On the other hand, the hydroxyl group in soil increases anion exchange capacity under a low pH condition. The main objective of this paper was to evaluate effects of kaolin on nitrate reduction under acidic condition. In order to analyze the kaolin adsorption behaviour under various conditions, four different concentrations of nitrate, 45, 112.5, 225, and 450 m g N O 3 - / L, with a constant pH equal to 2, constant temperature equal to 25°C, and exposure period varying from 0 to 150 minutes were considered. The capacity of nitrate adsorption on kaolin has also been studied involving two well-known adsorption isotherm models, namely, Freundlich and Longmuir. The results revealed that approximately 25% of the nitrate present in the solution was adsorbed on clay kaolin. The laboratory experimental data revealed that Freundlich adsorption isotherm model was more accurate than Longmuir adsorption model in predicting of nitrate adsorption. Furthermore, the retardation factor of nitrate pollution in saturated zone has been found to be approximately 4 in presence of kaolin, which indicated that kaolin can be used for natural scavenger of pollution in the environment.

Item Type:Article
Uncontrolled Keywords:kaolin, gibbsite, hematite
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Civil Engineering
ID Code:58645
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 04:07
Last Modified:24 Oct 2021 08:06

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