Effect of clays, metal oxides, and organic matter on rhamnolipid biosurfactant sorption by soil

Clay mineral dependent desorption of pyrene from soils by single and mixed anionic–nonionic surfactants

“…Hence, greater sorbed amounts of surfactant show a higher packing density and create a more hydrophobic environment that would hinder desorption of pyrene [55]. The results of sorption in this study are similar to the finding regarding sorption of anionic biosurfactants on soils with different compositions of clays [56]. Both studies demonstrate the negative effect of surfactant sorption on the effectiveness of SER remediation.…”

Surfactant-enhanced remediation of organic contaminated soil and water

“…The observed isotherm of rhamnolipid adsorption onto soil are composed of three regions [130], similar to that of synthetic surfactants [52]. Adsorption isotherm of R 1 on different clay, like illite and Ca-montmorillonite are typical twostep adsorption showing the formation of hemimicelle like [132]. Moreover, since the adsorption is non-linear in nature, there are large differences in adsorption at low and high concentrations of rhamnolipid.…”

“…Although there are many biosurfactants, most of the adsorption studies are concentrated on rhamnolipid surfactant [129][130][131][132]. Adsorption of rhamnolipid biosurfactant on soil depends on different soil parameters like clay, metal oxides, and organic mater of soil [131,132].…”

Humic substances from sewage sludge compost as washing agent effectively remove Cu and Cd from soil

“…For example, Hong (2000, after Hong 2002 showed that the amount of SAP sorbed onto soils increases with decreasing pH due to the increased electrostatic attraction between SAP and the soil surface. Sorption of biosurfactants can reduce their potential for removal of contaminants from various components of the soil (Ochoa-Loza et al, 2007). Wang and Mulligan (2009b) found that under acidic conditions (at pH 3.0), arsenic mobilization with HA decreased due to their sorption to mine taillings.…”