Investigation of adsorption of pesticides by organo-zeolite from wastewater

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2011
Lüle, Güzide Meltem
The aim of this study was to determine the adsorption capacity of activated carbon and organo-zeolites for removal of pesticides in water. In order to prepare organo-zeolite, two kinds of cationic surfactants, namely, hexadecyltrimethyl ammonium bromide (HTAB) and dodecyltrimethyl ammonium bromide (DTAB) were used. Adsorption studies of cationic surfactant on zeolite were investigated in respect to initial concentration of cationic surfactant, time, and temperature. It has been found that the best fitted isotherm equation was Langmuir equation. The observed adsorption rates were found to be equal to the second order kinetic model. The activation energies of cationic surfactant adsorption was determined by using Arrhenius equation. S and H values were also calculated from the van’t Hoff equation. Adsorption of pesticides (2,4-D, propanil, diazinon, fenitrothion, trifluralin) onto activated carbon and organo-zeolite were investigated by evaluating the adsorption isotherms and fitting the data to Langmuir and Freundlich equations. The effects of initial concentration of pesticide, time, pH, and temperature on adsorption were investigated. Adsorption rates were calculated for each of pesticide. The activation energies of pesticide adsorption were determined by using Arrhenius equation. S and H values were also calculated from the van’t Hoff equation.
Citation Formats
G. M. Lüle, “Investigation of adsorption of pesticides by organo-zeolite from wastewater,” Ph.D. - Doctoral Program, Middle East Technical University, 2011.