Sorption Behaviors of Sodium Dodecylbenzene Sulfonate (SDBS) on Marine Sediments

Abstract

The sorption behavior of sodium dodecylbenzene sulfonate (SDBS), an anionic surfactant, on marine sediments was systematically investigated. The experimental results showed that 100 min was required for the adsorption equilibrium. For the sediments treated by HCl and H 2 O, sorption behavior of SDBS was fit with linear isotherm very well over the concentration range studied at 298 K. The sorption occurred primarily due to partition function of hydrophobic chains into organic carbon of sediments. Sorption of SDBS on H 2 O 2 -treated sediments was satisfactorily fit with Freundlich isotherm model and mainly through surface function of clay minerals in the sediment. The sorption was favorably influenced by the increased salinity, deceased pH and decreased temperature of seawater.

Effect of adsorption site potential on adsorption of sodium dodecylbenzenesulfonate in highly humic volcanic ash soil

“…This result is consistent with those of other studies (Fytianos et al 1998;Li et al 2008;Ahmed et al 2012b). The result indicates that the repulsive electric potential at the adsorption site became smaller at lower pH, as will be shown in the next section, because the absolute value of the pH-dependent, negative charge of the soil was smaller at lower pH.…”

“…The amount of DBS adsorbed increased as the electrolyte concentration increased for both B-DBS and L-DBS. This result is consistent with those of other studies (Nevskaia et al 1998;Paria et al 2005;Li et al 2008). The increase occurred because at higher electrolyte concentrations the repulsive electric potential at the adsorption site became smaller, as shown in the next section, from screening of the electric field.…”

“…Nonionic and cationic surfactants have much higher sorption with soil and sediment than anionic surfactants do (Urano et al 1984;Rodríguez-Cruz et al 2005;Ying 2006). It has been observed that DBS adsorption decreased as pH increased (Inoue et al 1978;Fytianos et al 1998;Li et al 2008;Ahmed et al 2012b) and that DBS adsorption correlated positively with organic matter content (McAvoy et al 1994;Fytianos et al 1998). The effect of pH and DBS concentration on the dissolution of humic substances from highly humic volcanic ash soil at different electrolyte concentrations has also been observed (Ahmed et al 2012a).…”

“…They showed that an increase in the electrolyte concentration causes screening of the electric attraction between the surfactant and metal surface and leads to a decrease in adsorption at lower surfactant concentrations. In contrast, an increase in the electrolyte concentration enhances the adsorption of anionic surfactant onto a negatively charged solid (Nevskaia et al 1998;Paria et al 2005;Li et al 2008). However, the theoretical interpretation for those phenomena has not been conducted exactly, although those for the adsorption on oppositely charged surface has been done well.…”

New Insights in the Treatment of Waste Water with Graphene: Dual-Site Adsorption by Sodium Dodecylbenzenesulfonate

“…Nowadays, SDBS is removed by several methods, such as coagulation, 6,7 biological degradation, 8,9 chemical oxidation, 10,11 electrochemical removal, 12 adsorption on carbonaceous materials such as coal, 13 carbon black, 14,15 activated carbon, 16,17 and carbon nanotubes, 18 and adsorption on other materials such as soils, 19,20 clay, 21−23 and marine sediments. 24 Among these methods, adsorption on carbonaceous materials is the most widely used, because it is characterized by a facile operation with relatively high adsorption capacities. It should be stressed that the identification of more industrially relevant carbonaceous materials is still an important challenge.…”