Kinetic model for surfactant-induced pore wetting in membrane distillation

Membrane Distillation Hybrid Peroxydisulfate Activation toward Mitigating the Membrane Wetting by Sodium Dodecyl Sulfate

“…When the SDS concentration was increased to 0.8 mM, the PVDF membrane sharply lost its vapor permeability within 2 h, while the flux of the PTFE membrane gradually dropped to a final value of 4 kg/m 2 /h, with the performance of their permeate conductivity in line with the flux behavior (not further extended). Previous studies have confirmed experimentally and theoretically that the SDS monomers tend to distribute on the membrane surface due to hydrophobic-hydrophobic interaction between the non-polar tails of the SDS and the hydrophobic membrane, and the adsorption of SDS would finally turn the membrane hydrophilic, partially wetted [32][33][34][35][36]. The present data agreed with the membrane wetting phenomenon by surfactant adsorption and highlighted the different behavior of two membrane coupons.…”

Understanding the fouling/scaling resistance of superhydrophobic/omniphobic membranes in membrane distillation

“…Once fouled by the surfactants, the membranes are prone to wetting by the feed streams though some contradictory results have been reported. For example, Wang et al [30,90,91] have shown that surfactant attachment to the membrane surface intrinsically inhibits surfactant-induced wetting rather than facilitates it, and Liquid Entry Pressure (LEP) of membranes is reduced. Literature also reveals that the combination of oil, surfactant and NaCl drastically deteriorates MD performance, but when the feed solution contains oil or surfactants or NaCl alone, the effect was not apparent [92].…”

Recent advances in membrane development for treating surfactant- and oil-containing feed streams via membrane distillation

“…Recently, researchers have also attempted to better understand the mechanisms involved in membrane wetting caused by surfactants and oils via electrical impedance spectroscopy [27,28], molecular dynamics simulations [29], and theoretical models [30]. With a more solid foundation built upon these studies, robust MD membranes with fouling-and wetting-resistant properties could be engineered via targeted surface modification techniques for water recovery from lowsurface-tension high-salinity feed streams.…”