Adsorption study of an industrial dye by an organic clay
- PDF / 318,954 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 94 Downloads / 252 Views
Adsorption study of an industrial dye by an organic clay A. Khenifi · Z. Bouberka · F. Sekrane · M. Kameche · Z. Derriche
Received: 18 January 2006 / Revised: 31 December 2006 / Accepted: 5 July 2007 / Published online: 5 September 2007 © Springer Science+Business Media, LLC 2007
Abstract In this study, the adsorption of an industrial dye Supranol Yellow 4GL onto Cetyltrimethylammoniumbentonite (CTAB-bentonite) is investigated. The organobentonite is synthesised by exchanging cetyltrimethylammonium cations (CTAB) with inorganic ions on the surface of bentonite. The adsorption of Supranol Yellow 4GL onto organobentonite is found to be maximum when the concentration of CTAB exchanged is 100% according to the cation exchange capacity of the clay (CEC). The modification of organobentonite is examined using XRD and FTIR techniques. The effect of the process parameters such as: contact time, adsorbate concentration, adsorbent dose, pH and temperature are reported. Nearly 1200 seconds of contact time are found to be sufficient for the adsorption to reach equilibrium. The pseudo second order model is used to describe the kinetic data, and the rate constant is therefore evaluated. The dye adsorption to organobentonite is characterized by monolayer isotherm and caused by adsorption with relatively strong uptake. The Langmuir and Freundlich models adsorption are applied to describe the isotherm equilibrium and to determine its constants. The Langmuir and Freundlich models agree well with the experimental data with a adsorption capacity of 0.5 g of dye per g of organobentonite. A better fixation was obtained at acidic pH. The effect of temperature on the adsorption of dye has been also studied and the thermodynamic parameters H , S, G,
A. Khenifi · Z. Bouberka · F. Sekrane · M. Kameche · Z. Derriche () Physico-Chemical Materials Laboratory, Chemistry Department, Faculty of Science, USTO-MB, M’Nouar 1505, Oran 31000, Algeria e-mail: [email protected]
were determined. Organobentonite is found to be effective for removing Supranol Yellow 4GL dye from wastewater. Keywords Adsorption · Supranol Yellow 4GL · Bentonite · CTAB · Langmuir Abbreviations Ci the initial concentration of dye, g/L Ce the concentration of dye in solution after equilibrium, g/L V the total volume of the solution, L m the mass of the adsorbent, g qe the amounts of dye adsorbed at equilibrium time, g/g q the amounts of dye adsorbed at time t, g/g K1 the pseudo-first order rate constant, sec−1 K2 the pseudo-second order rate constant, sec−1 qm the amount of solute adsorbed per weight of adsorbent in forming a complete monolayer on the surface, g/g b Langmuir constant related to the energy, L/g RL dimensionless separation factor k and n Freundlich constants kd the partition coefficient, L/g
1 Introduction One of the major problems concerning textile wastewaters is coloured effluents. Though not particularly toxic, dyes have an adverse aesthetic effect because they are visible pollutants. The presence of colour reduces aquatic diversity by blocking the pas
Data Loading...
