The removal of phenolic compounds from aqueous solutions by organophilic bentonite

Journal of Hazardous Materials
Mehmet Akçay, Gülten Akçay

Abstract

The adsorption of p-chlorophenol (p-CP) and p-nitrophenol (p-NP) on organophilic bentonite (dodecylammonium bentonite, DDAB) was studied as a function of solution concentration and temperature. The observed adsorption rates were found to be equal to the first-order kinetics. The rate constants were calculated for temperatures ranging between 25.0-35.0 degrees C at constant concentration. The adsorption energies, E and adsorption capacity, (qm), for phenolic compounds adsorbed to organophilic bentonite were estimated by using the Dubinin-Radushkevic equation. Thermodynamic parameters from the adsorption isotherms of p-CP and p-NP on organophilic bentonite were determined. These isotherms were modeled according to Freundlich and Dubinin-Radushkevic adsorption isotherms and followed the V-shaped isotherm category with two steps. The amount of adsorption was found to be dependent on the relative energies of adsorbent-adsorbate, adsorbate-solvent and adsorbate-adsorbate interaction.

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Citations

Dec 5, 2012·Journal of Colloid and Interface Science·Yuri ParkRay L Frost
Jul 29, 2008·Journal of Hazardous Materials·Erdal Eren
Oct 13, 2006·Journal of Hazardous Materials·Dengyong TangJibiao Zhang
Jul 21, 2015·Journal of Colloid and Interface Science·Layaly ObeidAgnès Bée
Jun 10, 2016·Colloids and Surfaces. B, Biointerfaces·Janaína NonesNivaldo Cabral Kuhnen
Jan 6, 2007·Journal of Colloid and Interface Science·Liang-Guo YanShuzhen Zhang
Nov 28, 2008·Journal of Agricultural and Food Chemistry·Eva RodríguezPedro Alvarez

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