Enhanced Hydrophilic and Antipollution Properties of PES Membrane by Anchoring SiO₂/HPAN Nanomaterial

Abstract

In this paper, a hydrophilic SiO 2 /hydrolyzed polyacylonitrile (HPAN)/polyethersulphone (PES) hybrid membrane was fabricated by blending PES with a series of SiO 2 /HPAN nanoparticles, which were prepared by hydrolyzing PAN and ethyl orthosilicate (TEOS) synchronously. During the phase inversion processing to fabricate the membrane, SiO 2 /HPAN would blend into the matrix and anchor on the surface of the membrane. By tuning the hydrolyzing time of the HPAN/SiO 2 and the content of HPAN/SiO 2, water flux and antifouling properties of the SiO 2 / HPAN/PES hybrid membrane improved significantly in the ultrafiltration process. The experiment demonstrated that, when blending with 10% content of SiO 2 /HPAN-1.5h, the SiO 2 /HPAN/PES hybrid membrane could achieve optimal performance: the water contact angle decreased to 42.08°, the water flux increased to 354 L/m 2 h, the bovine serum albumin (BSA) flux increased to 144 L/m 2 h, and the BSA rejection increased to 94.2%. Besides, the water flux remained at 250 L/m 2 h after fouling with BSA solution, which was higher than that of the neat membrane. Interestingly, the experiment also found that the SiO 2 /HPAN/PES hybrid membrane remained the high performance at high temperature, and the BSA and oil flux even enhanced when the temperature increased from room temperature to 80 °C. It exhibited that the separation performance of the membrane enhanced greatly with anchoring SiO 2 / HPAN nanoparticles.

Antifouling membranes for oily wastewater treatment: Interplay between wetting and membrane fouling

“…are dispersed into the membrane matrix for membrane preparation. [23,47,52,56,94,98,111,113,121,122]…”

Hydrophobicity of Polyacrylate Emulsion Film Enhanced by Introduction of Nano-SiO2 and Fluorine

“…Figure 2 shows the FT-IR spectra of Nano-SiO 2 , modified Nano-SiO 2 , and Si/F polyacrylate latex. The 1100 cm −1 and 468 cm −1 peaks in the Nano-SiO 2 spectrum are the stretching and bending vibration absorption peaks of Si–O–Si, respectively [ 26 ]. After modification using KH-570, new characteristic absorption peaks appeared.…”

“…The peaks located at 2953 cm −1 and 2842 cm −1 are the stretching vibration of C-H belonging to –CH 3 and –CH 2 –. The characteristic stretching vibration peak of C=O also appears at 1724 cm −1 , indicating that KH-570 molecules were successfully grafted on the surface of Nano-SiO 2 [ 7 , 26 , 27 , 28 ]. In Si/F polyacrylate latex spectrum, the characteristic peaks of C–F, Si–O–Si, and ether [(O=C)–O–C] appear in at 1350–1090 cm −1 , 1250–1000 cm −1 and 1075–1020 cm −1 , respectively.…”

“…The silica nanoparticles were prepared through the minor modification [ 26 ]. With this method, ammonia and ethanol solution were mixed in a three-neck flask in a water bath.…”

A novel nanofiltration membrane with simultaneously enhanced antifouling and antibacterial properties

“…[12][13][14] The most common way to improve the hydrophilicity of a membrane surface to mitigate organics deposition onto the membrane surface is the adhesion of a hydrophilic coating to the upper membrane layer. [15][16][17] Commonly used methods are: a hydrophilic polymer is chemically modied and graed onto the surface of the lm by coating or plasma polymerization, so that the hydrophilicity of the lm surface is greatly improved. Besides, numerous types of metal or metal oxide nano-size particulates are used to modify the membrane surface, such as silver (Ag) and silver nitrate (AgNO 3 ), showing excellent antibacterial properties.…”