Removal of an Ionic Surfactant From Wastewater by Carbon Blacks Adsorption

Abstract

The adsorption of an ionic surfactant, sodium dodecyl sulfate (SDS), from aqueous solution onto six carbon blacks with different surface characteristics has been studied in various ranges of low concentrations. The process can be related to types of interactions that are always the same since the adsorption in these systems depends mainly on the porosity of the samples but not on the chemical composition of the surface. However, adsorption progresses follows two processes: the first one related to the adsorption of SDS into the narrowest pores with a suitable width, and the second one related to adsorption of SDS onto a more open surface. 2823

Adsorption enthalpies of sodium dodecyl sulphate onto carbon blacks in the low concentration range

“…(1) to the experimental isotherms made it possible to analyze the SDS adsorption onto these carbon blacks and to spilt it into two adsorption processes on different energetic parts of the carbon surface [7,8]. In Figs.…”

“…The relevant isotherms of SDS adsorption onto the set of carbon blacks at 20°C, have already been carried out and published [7]. The isotherms were determined in an equilibrium concentration range below %1.0 · 10 À3 mol l À1 which is much lower than the c.m.c.…”

“…Generally, adsorption enthalpies offer the opportunity for studying conformational changes in the adsorbed phase, influence of adsorbent surface characteristics on the process as well as the different types of interactions in the system [11,12]. So the purpose of this work is to carry out a calorimetric study for systems previously characterized by the analysis of their adsorption isotherms [7,8], in order to gain a better knowledge of the adsorption mechanism. In the present work, the calorimetric technique has been applied to the adsorption of an ionic surfactant, sodium dodecyl sulphate, from aqueous solutions onto a set of carbon blacks with different surface characteristics.…”

“…By this method we have studied different solid-liquid adsorption systems, such as non-ionic or ionic surfactants adsorption onto various kinds of carbonaceous materials [5][6][7][8][9]. This method allowed us to evaluate the maximum amount adsorbed (X mi ) and the free energy of adsorption (DG adsi ) associated to each of the adsorption processes for a given solid-liquid system.…”

Selection and evaluation of adsorbents for the removal of anionic surfactants from laundry rinsing water

“…Anionic surfactant adsorption from water has been studied extensively. Many adsorbent materials have been investigated-for example, alumina (Adak et al, 2005), zeolites (Savitsky et al, 1981), (Yang et al, 2006), sediment (Westall et al, 1999), bentonite (Gunister et al, 2004), sand (Khan and Zareen, 2006), sludge , silica gel (Purakayastha et al, 2005a), resins (Garcia-Delgado et al, 1992), activated carbons (Purakayastha et al, 2005a;Wu and Pendleton, 2001;Gonzalez-Garcia et al, 2002;Gonzalez-Garcia et al, 2004; and waste tyre rubber (Purakayastha et al, 2005b). However, few studies (Purakayastha et al, 2005a), compare a range of materials.…”