期刊名称：Pakistan Journal of Analytical & Environmental Chemistry
印刷版ISSN：1996-918X
电子版ISSN：2221-5255
出版年度：2013
卷号：14
期号：2
页码：28-37
语种：English
出版社：National Centre of Excellence in Analytical Chemsitry
摘要：This study explores,adsorption efficiency of p-tert-butylcalix[4]arene based modified silica to remove parathion from aqueous environment. The adsorption parameters,i.e. pH,concentration of pesticide solution,contact time and adsorbent dosage were optimized,as 10,1 mg L-1,40 min and 0.04 g,respectively. Langmuir,Freundlich and Dubinin-Radushkevich (D-R) isotherm models were used to evaluate the adsorption mechanism. Adsorption constants values of these models suggest that the adsorption of parathion is favorable and were found to be best fit with Freundlich isotherm. From the kinetic study it can be predicted that adsorption of parathion follows Ho and McKay model (pseudo-second order). Thermodynamic parameters,enthalpy (ΔH),entropy (ΔS) and Gibbs free energy (ΔG) have also been evaluated and were found as -132.25,0.45,-4.14 Jmol-1,respectively..
