Adsorption of perfluorinated compounds on thin‐film composite polyamide membranes

Abstract

ABSTRACT:The adsorption behavior of perfluorinated compounds (PFCs), of various chain lengths and two different functional groups, on widely used thin-film composite polyamide membranes has been investigated. Three commercially available polyamide membranes and two classes of PFCs were evaluated: Dow-Filmtech BW30, NF90, and NF270 membranes; perfluorosulfonic and perfluoroalkanoic acid with 5, 7, 9, and 11 carbon atoms. The adsorption of PFCs on the membranes strongly depended on the active skin-top layer material of the membranes, solution chemistry, and structure of PFCs. The piperazine based NF270 membrane showed higher adsorption of PFCs compared to BW30 and NF90 membranes (FT-30 type membranes). The BW30 membrane, which has a coating layer of aliphatic carbons and hydroxyl groups on the surface of the polyamide substrate, had less interaction with PFCs than the NF90 polyamide membrane had. The adsorption of PFCs increased with increasing ionic strength, decreasing pH, and in divalent ion solutions. PFCs with longer chain lengths and more hydrophobic functional groups showed more attractive interactions with thin-film composite membranes and, thus, greater adsorption on the membranes.

Protection of polymeric membranes with antifouling surfacing via surface modifications

“…Over the past three decades, polymeric membranes have become the most intense focus of many physicists, chemists, and biotechnical scientists [1][2][3][4] due to the unique membrane separation properties of selective and proficient separation without any chemicals and as these membranes can be utilized isothermally at low temperatures with less energy consumption compared with other energy intensive conventional methods [5][6][7]. Pressure-driven membrane process such as microfiltration (MF), ultrafiltration (UF), and nanofiltration (NF)) have been widely used because of strong demand in many industrial applications like water purification, seawater Desalination, wastewater treatment and reuse, food processing and bioseparation [8][9][10].The number of membrane separation applications continues to increase, but these processes suffer from concentration polarization and membrane fouling which limit the membrane flux during filtration and negatively impact production efficiency with corresponding increases in energy consumption [11][12][13].…”

Long-Term Stability of Low-Pressure Reverse Osmosis (RO) Membrane Operation—A Pilot Scale Study

“…However, despite the recent noticeable progress in the membrane performance, the membrane still suffers from the membrane fouling that is an accumulation of various contaminants on the membrane surface. Fouling by such a build-up of organic contaminants can cause irreversible damage to the membrane surface, which can deteriorate the membrane performance during the system operation, eventually leading to a shortening of the membrane lifetimes [10,14,15,[22][23][24][25][26][27][28]. The application of LPRO can be also limited by the membrane fouling.…”

Fabrication of novel poly(m-phenylene isophthalamide) hollow fiber nanofiltration membrane for effective removal of trace amount perfluorooctane sulfonate from water

“…To investigate this phenomenon, the PFOS adsorption on the PMIA hollow fiber membrane was determined using a method similar to Ref. [60] Furthermore, atomic force microscopy (AFM) was also adopted to characterize the three-dimensional image and roughness of the surface of the virgin and fouled membrane [61][62][63][64][65]. Flux reduction as observed from Figs.…”