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- Title
Removal of Parathion from Aqueous Media Through p-tert-Butylcalix[4]arene Based Modified Silica.
- Authors
Memon, Sibghatullah; Memon, Najma; Memon, Shahabuddin
- Abstract
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.
- Subjects
PARATHION; AQUEOUS solutions; SILICA analysis; THERMODYNAMICS; ADSORPTION (Chemistry); LANGMUIR probes
- Publication
Pakistan Journal of Analytical & Environmental Chemistry, 2013, Vol 14, Issue 2, p28
- ISSN
1996-918X
- Publication type
Article