Adsorption study of tymol on Na-bentonite

Abstract

This paper presents the study of adsorption of thymol on a clay support (bentonite). The clay used was collected from the province of Nador (North-East of Morocco). The clay was purified and doped with sodium prior to use. The obtained adsorption isotherm presents a Langmuir type for low values of equilibrium concentration with a rise of the isotherm showing a certain affinity of thymol for anionic clay sites. The adsorbed amount of thymol determined at the plateau of the isotherm was 177 mg per gram of sodium clay. The adsorption kinetic was described successfully using a pseudo-second-order rate equation, and the adsorption was rapid with 90 % of the thymol adsorbed within the first 20 min.