Effect of SDBS–Tween 80 mixed surfactants on the distribution of polycyclic aromatic hydrocarbons in soil–water system

Abstract

Purpose Enhancing desorption of hydrophobic organic contaminants from soils is a promising approach for the effective remediation of soils contaminated with organic compounds. The desorption efficiency of chemical reagent, such as surfactant, should be evaluated. In this study, the effect of mixed anionic-nonionic surfactants sodium dodecylbenzene sulfonate (SDBS)-Tween 80 on the distribution of polycyclic aromatic hydrocarbons in soil-water system was evaluated. Materials and methods Batch desorption experiments were employed to evaluate the distribution of polycyclic aromatic hydrocarbons (PAHs) and surfactants in soil-water system. PAHs and SDBS were determined by highperformance liquid chromatography, Tween 80 by spectrophotometry, and total organic carbon with a carbon analyzer. Results and discussion Sorption of PAHs to soil was increased at low surfactant concentration due to the effective partition phase on soil formed by sorbed surfactants. The mixture of anionic and nonionic surfactants decreased the sorption of surfactants to soil, increasing the effective surfactant concentration in solution and thus decreasing the sorption of PAHs on soil. Anionic-nonionic mixed surfactant showed better performance on desorption of PAHs from soil than single surfactant. The greatest desorption efficiency was achieved with low proportions of SDBS (SDBS/Tween80=1:9). Conclusions SDBS-Tween 80 mixed surfactant showed the highest desorption rate with low proportion of SDBS, which indicated that the addition of relative low amount of anionic surfactant could significantly promote the desorption efficiency of PAHs by nonionic surfactants. Results obtained from this study did provide useful information in surfactant-enhanced remediation of soil and subsurface contaminated by hydrophobic organic compounds.

Effects of oil dispersant on solubilization, sorption and desorption of polycyclic aromatic hydrocarbons in sediment–seawater systems

“…2) and the dispersant adsolubilization of the PAHs. Zhang and Zhu (2010) reported that Tween 80 inhibited desorption of PAHs from soil and they attributed it to elevated hydrophobicity of soil.…”

“Green” Synthesis of Nanocarbons for Reduced Friction and Wear

“…Indeed, by mixing SDBS and Tween 80, the strong electrostatic self-repulsions of the former and the steric self-repulsions of the latter decrease due to coexistence around the nanoparticle of both species. At the same time, ion-dipole attractions and Van der Waals forces between the hydrophilic groups of both the surfactants also contribute to strengthening the dispersion [42][43][44][45][46]. It is worth noticing that the A ratio for rGO in SDBS and Tween 80 at 0.1 wt%, as evaluated after a longer time centrifugation of 2 h, results still equal to 0.87.…”

Solubilization of polycyclic aromatic hydrocarbons in structurally different gemini and monomeric surfactants: A comparative study

“…Mohamed and Mahfoodh [34] have also studied the water solubility enhancement of naphthalene and pyrene by micellar solution of single (SDS, Tween 80) and mixed SDS-Tween-80 surfactant systems. Some significant work on solubilization behavior of PAHs is being carried out in various laboratories [35][36][37][38][39]. Kabir-ud-din and his group [40] performed the solubilization aspects of pyrene and anthracene by single and mixed gemini-conventional surfactant systems.…”