Synthesis and characterization of poly(arylene ether ketone) copolymers with pendant carboxylic acid groups for antifouling ultrafiltration membrane

Abstract

This work focused on the synthesis of a series of poly(arylene ether ketone) random copolymers with various controlled pendant carboxylic acid groups (PEAK-COOH) by direct copolymerization method and the preparation of antifouling ultrafiltration membranes via the conventional immersion precipitation phase inversion method. The morphologies of the PEAK-COOH membranes were investigated by scanning electron microscopy. In addition, the surface hydrophilicity and charged property of the PEAK-COOH membranes were studied by water contact angle and membrane potential measurements, and the results indicated that the introduction of COOH on the polymer chains of membrane materials was really an effective way to negatively charge the membrane and enhance the hydrophilicity. The pure water flux and protein solution permeation through the prepared membranes were increased with the increase in the content of carboxylic acid groups. The cycle ultrafiltration experiments for protein solution revealed that nonspecific protein adsorption, especially irreversible protein adsorption, for the PEAK-COOH membranes, was significantly reduced, suggesting superior antifouling performance.

Fabrication of high-performance ultrafiltration membranes using zwitterionic carbon nanotubes and polyethersulfone

“…where η is the water viscosity (8.9 × 10 −4 Pa s), Q is the volume of permeate pure water per unit time (m 3 /s), and Δ P is the operation pressure (0.1 MPa).…”

“…Membrane-based separation technologies, such as ultrafiltration (UF) and nanofiltration (NF), are efficient and environmental-friendly strategies for wastewater treatment and seawater desalination. [1][2][3][4] Among the available separation membranes, UF membrane, with a pore size of 1-100 nm, is the most widely used one to remove protein, colloid, bacteria, and humic substances, based on size-sieving mechanism. 5 The performance of UF membrane is generally determined by its water permeability, stain resistance, and reusability.…”

Tight ultrafiltration membrane: Preparation and characterization of thermally resistant carboxylated cardo poly (arylene ether ketone)s (PAEK-COOH) tight ultrafiltration membrane for dye removal

“…Carboxylated polysulfone-based FO membranes showed significant higher fluxes than PSF-based FO membranes [19]. Wang et al have found that the introduction of pendent carboxylic acid group into poly(arylene ether ketone) copolymers could prepare good antifouling ultrafiltration membranes [20]. We can conclude form the above that the carboxylated materials not only possess good solubility and high hydrophilicity, but also have anti-swelling property and dimension stability, when compared with other hydrophilic materials, such as sulfonated polymers which are difficult to be dissolved in solvent and susceptible to swelling in water at high sulfonation degree [21,22].…”

An effective approach to fabrication of antifouling ultrafiltration membrane based on zwitterionic polyimide

“…According to the literature, four different modification strategies have been proposed, 5,6 including (a) blending of the membrane material with modifying additives in casting solutions during membrane preparation (additive), 7,8 (b) advanced surface modification or functionalization after membrane preparation (post-modification), 9,10 (c) direct modification of the membrane material before membrane preparation (premodification), 11 and (d) synthesis of novel polymers with well-defined structures as membrane materials (synthesis). 12,13 In the additive method, the modification of the membrane is done through a simple blending technique, and no additional step is required during the membrane preparation process. However, the presence of the modifying additives in the membrane matrix leads to instability due to the migration and agglomeration phenomena, which could render a persistent antifouling property.…”