Effects of Linear Alkylbenzene Sulfonate on the Sorption of Brij 30 and Brij 35 onto Aquifer Sand

Abstract

Surfactant sorption is of considerable importance to environmental applications, including surfactant flushing to mobilize hydrophobic contaminants; effects of surfactants on the transport of dissolved contaminants, microorganisms, and colloids through porous media; and bioremediation of hydrophobic organic compounds, as well as understanding the fate and transport of surfactants as environmental contaminants themselves. Although most sorption studies consider pure surfactants, commercial detergent formulations typically consist of mixtures of nonionic and anionic surfactants. In this study, the effects of varying concentrations of the anionic surfactant linear alkylbenzene sulfonate (LAS) on micelle formation and sorption behavior of the two commonly used nonionic surfactants Brij 30 and Brij 35 onto aquifer sand were examined. A strong linear relationship was observed between the critical micelle concentration (CMC) of the Brij surfactants and the concentration of LAS in the mixture, with the CMC decreasing with increasing concentration of LAS. The relative change in CMC as a function of the LAS concentration was identical forthe two Brij surfactants, indicating that LAS interacted with their common alkyl chains. Sorption isotherms were developed for Brij 30 and Brij 35 present as single surfactants in an aqueous solution as well as when present with LAS. Although LAS had minor effects on the maximum sorption plateaus of the Brij surfactants, Brij sorption at was significantly enhanced as a function of the LAS concentration for Brij aqueous concentrations below the CMC. Application of a multi-interaction isotherm model indicated that the formation of surface aggregates (e.g., hemimicelles) decreased with increasing LAS concentration. Overall, these results provide insight into the complex sorption behavior of surfactant mixtures.

Biochemical synthesis of novel, self-assembling glycolipids from ricinoleic acid by a recombinant α-glucosidase from Geobacillus sp.

“…The critical micelle concentration (CMC) and the surface tension (cCMC) were estimated as 6.8 9 10 -5 M (31 mg l -1 ) and 40.1 mN m -1 , respectively. CMC values of GL-1 indicated lower CMC values than commercial ionic surfactant such as linier alkylbenzene sulfate (approximately 200 mg l -1 ) (Tripathi and Brown 2008), and cCMC of GL-1 corresponded to that of LAS. In this condition, GL-1 shows excellent surface activity as ionic surfactant.…”

Removal of phenol from synthetic waste water using Gemini micellar-enhanced ultrafiltration (GMEUF)

“…In the synthetic solution of Brij35/phenol and SDS/phenol, the concentration of Brij35, SDS and phenol were analyzed by Extinction Coefficient method [19,20] with UV-2102 PCS spectrophotometer. In the synthetic solution of DTAB/phenol and CG/phenol, the concentration of phenol was measured by UV absorption at a wavelength of 270 nm.…”

Arsenic retention and transport behavior in the presence of typical anionic and nonionic surfactants

“…Surfactants have been widely used in the enhanced remediation of pollution caused by organic matters and heavy metals (Edwards et al, 1991;Mulligan et al, 2001;Nivas et al, 1996;Tripathi and Brown, 2008;Zhao et al, 2006). Previous studies have shown that surfactants with a concentration higher than 10 CMC (critical micelle concentration) had great potential in eluting arsenic from mine tailings.…”

“…When entering the environment, surfactants tend to be adsorbed onto particles and sediments, thus altering the physicochemical characteristics of particle surfaces and influencing the environmental behavior of other pollutants. It is suggested that surfactants could exert significant effects on the adsorption and release of organic matters and heavy metals (Pan et al, 2009;Song et al, 2008;Tripathi and Brown, 2008;Turner and Xu, 2008). The mechanisms mainly include adsorption competition, complexation reactions, solubilization and electrostatic repulsion (Clara et al, 2007;de Wolf and Feijtel, 1998;Fu et al, 2007;Kloepper-Sams et al, 1996;Lara-Martin et al, 2008;Shalaby, 2007).…”