Langmuir, Freundlich, Temkin and Dubinin–radushkevich Isotherms Studies of Equilibrium Sorption of Ampicilin unto Montmorillonite Nanoparticles
Davoud Balarak
Health Promotion Research Center, Department of Environmental Health, School of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran.
Ferdos Kord Mostafapour
Health Promotion Research Center, Department of Environmental Health, School of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran.
Hossein Azarpira *
Social Determinants of Health Research Center, Saveh University of Medical Sciences, Saveh, Iran.
Ali Joghataei
Student Research Committee, Qom University of Medical Sciences, Qom, Iran.
*Author to whom correspondence should be addressed.
Abstract
Present study was accomplished to prospect the viability of using the montmorillonite (Mon) nanoparticles as an adsorbent to remove the Ampicillin under various experimental conditions. The Physico-chemical characteristics of the studied adsorbent were surveyed. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms were applied to portray the data obtained from the adsorption studies. The findings showed that the highest R2 values were related to Langmuir and Dubinin–Radushkevich isotherm models. The greatest adsorption capacity (qe) for Langmuir and Dubinin–Radushkevich isotherm models were recognized to be 134.48 mg/g and 141.22 mg/g, respectively; and the separation factor was calculated to be 0.113 which is indicative of a favorable sorption. Temkin Isotherm model clarified that the heat of sorption process was 34.61 J/mol; and the mean free energy calculated by Dubinin–Radushkevich isotherm model was anticipated to be 2.56 Kj/mol which these undoubtedly demonstrate the physisorption process for Ampicillin adsorption experiments.
Keywords: Montmorillonite nanoparticles, ampicilin, isotherm.