The surfactant molecule is composed of two short fluoroalkyl chains connected to a PEG molecule via two IPDI spacers. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Herein, a series of nonionic urethane fluorinated surfactants (FmEGnFm) were synthesized by one-pot method using poly (ethylene glycol) (PEG), isophorone diisocyanate (IPDI) and short chain fluorinated alcohol as raw materials. HDTMA and PVPcoS modified montmorillonites were studied for treating PFOA wastewater.
https://doi.org/10.1016/j.molliq.2019.111851.
In addition, this product can provide stain and dirt pick up resistance by making the coating surface oleophobic. We use cookies to help provide and enhance our service and tailor content and ads. Furthermore, the optimal degradation efficiency for PFOA was obtained at neutral pH by the compromise of hydrated electron yield and self-assembled micelle structure. Nonionic urethane fluorinated surfactants with double short fluoroalkyl chains were synthesized. © 2019 Elsevier Ltd. All rights reserved.
The RfD is an estimate of the daily exposure level that is likely to Download : Download high-res image (242KB)Download : Download full-size image. Our recent study had developed a cationic surfactant induced ternary self-assembled micelle system to effectively degrade PFASs. As …
https://doi.org/10.1016/j.scitotenv.2020.140438. More importantly, the cytotoxicity experiment verified that these fluorinated surfactants had no obvious cytotoxicity.
Drying and curing processes of wet applied releases also are energy intensive, requiring consumption of fossil fuels and the attendant emission of greenhouse gases.
Perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic sulfonates (PFOS) are two typical fluorinated surfactants and have been most commonly produced and used for years [5,6], which usually can reduce the surface tension to as low as 15–20 mN/m [7,8]. Here, we systematically investigated the defluorination reaction in the presence of different organo-montmorillonites and found that the degradation process was apparently controlled by the configuration of surfactants. "Surfactant" stands for "surface active agent." Cationic surfactants with different molecular structures, including CTAB, DTAB, DDAB and TMAB were selected to study the effect of surfactant type on the degradation process, and their molecular structures are shown in Fig. While for double-chain surfactant, the steric effect might hinder the reaction. S2. According to the results of laser flash photolysis and dynamic light scattering, the degradation of PFOA was positively correlated with the chain length of the surfactants. Application of surfactant modified montmorillonite with different conformation for photo-treatment of perfluorooctanoic acid by hydrated electrons. Developing suitable alternatives to long fluoroalkyl chain surfactants has drawn considerable attention on account of the concerns over the environmental safety and human health. Perfluoroalkyl substance (PFAS) is a class of anionic surfactants with superior stability in the environment. Perfluorooctanoic acid is a fluoroalkanoic acid that is perfluorinated octanoic acid. These fluorinated surfactants show favorable wetting and emulsifying properties.
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