Kinetics and Thermodynamic Study of the Pesticide Absorption in Contaminated Waters using Biotite Silicate in Boroujerd, Lorestan, Iran

Abstract

Contamination of water sources by pesticides is considered as one of the environmental problems which are on growth due to agricultural development and the variation of herbal pesticides. The present study aims at making a Biotite absorber to omit the organic pollutant of water. In the current study, Biotite, which is found naturally in Boroujerd, west of Iran, is used to absorb pesticides including Permethrin, Diazinon, and Malathion. The effect of concentration, pH, and contact time on pesticide absorption was studied. The findings revealed that the aforesaid absorber has had the appropriate return to absorb the mentioned pesticides. The highest percentage of permethrin absorption by Biotite took place in the concentration of 4 ppm, pH= 7, and contact time of 20 minutes, while the highest percentage of Malathion by Biotite occurred in the concentration of 4 ppm, pH= 7 and contact time of 40 min. The findings indicated that the process of diazinon absorption follows isotherms like Langmuir and Freundlich. However, the process of permethrin and Malathion absorption follows Langmuir isotherm and Freundlich isotherm respectively. Generally, the findings from the present study can be used to plan various ways to control contamination in the industrial scale, decreasing destructive environmental effects in the waters contaminated by pesticides.