Effects of rhamnolipid biosurfactant on the dissolution and transport of silver nanoparticles in porous media

Abstract

The effects of nanoscale silver (nAg) particles on subsurface microbial communities can be influenced by the presence of biosurfactants, which have been shown alter nanoparticle surface properties. Batch and column...

Biosurfactant-mediated mobility of graphene oxide nanoparticles in saturated porous media

“…[44][45][46][47] Recently, Liao and coworkers investigated the effects of rhamnolipid bio-surfactants on the mobility of iron oxide nanoparticles and silver nanoparticles in saturated porous media. 48,49 They found that the presence of rhamnolipid (5-50 mg L −1 ) enhanced the transport of silver nanoparticles due to rhamnolipid adsorption onto the surfaces of silver nanoparticles, which effectively slowed the oxidation, as well as adsorption of rhamnolipid onto sand surfaces, which competed for silver nanoparticle attachment sites. 49 Moreover, Zhao et al found that 0.1% saponins signicantly enhanced the secondary transport of Pseudomonas migulae AN-1 cells due to the decreased hydrophobicity of bacteria and quartz sand.…”

“…48,49 They found that the presence of rhamnolipid (5-50 mg L −1 ) enhanced the transport of silver nanoparticles due to rhamnolipid adsorption onto the surfaces of silver nanoparticles, which effectively slowed the oxidation, as well as adsorption of rhamnolipid onto sand surfaces, which competed for silver nanoparticle attachment sites. 49 Moreover, Zhao et al found that 0.1% saponins signicantly enhanced the secondary transport of Pseudomonas migulae AN-1 cells due to the decreased hydrophobicity of bacteria and quartz sand. 50 Considering the unique chemical structure of GO (i.e., a layered nanomaterial containing graphene sheets and abundant reactive oxygen functional groups), 1 it likely interacts with biosurfactants via van der Waals interaction, hydrogen bonding, and/or hydrophobic interaction.…”