Preparation of a PES/PFSA-g-MWCNT ultrafiltration membrane with improved permeation and antifouling properties

Abstract

In this study, perfluorosulfonic acid (PFSA) was firstly grafted on multi-walled carbon nanotubes (MWCNTs) to obtain PFSA-g-MWCNT nanocomposites. The combination of MWCNTs with PFSA could effectively prevent the interactions among...

A high flux ultrafiltration membrane with a multi-hydrophilic particle additive and controlled self-assembly of micellar particles

“…8 membranes shows a high trend, with the amounts of water received in the previous hour and the amount of water received by preparing a certain concentration of BSA solution (BSA is usually chosen as a standard molecule to test the separation performance of membranes in the field of membrane separation, because this molecule is soluble, variable, and easy to detect). Also, an aqueous solution of BSA (7 nm) is used as simulated biomedical wastewater for the selective separation test of the membrane materials [55][56][57][58] . The amount of water received again after cleaning the membrane is also measured (by rinsing within a certain period of time, the pollution on the surface of the membrane is completely cleaned).…”

Incorporating MXene@MOF-303 Composites into Poly(vinyl alcohol) (PVA) to Fabricate Pervaporation Membranes for Desalination

“…Because there are strong hydrogen bonds between PVA and MXene@MOF-303, the formation of hydrogen bonds would affect the absorption peak. 33 The stretching vibrations at 2944 and 2915 cm −1 are symmetric and asymmetric peaks of the C−H bonds in PVA, respectively. 34 The stretching vibration at 1699 cm −1 is caused by the C�O bond, and the absorption peak at 1025 cm −1 is caused by the stretching vibration of the C−O−C bond.…”

“…However, with the increase in the MXene@MOF-303 content, the peak at 2θ = 20°of hybrid membranes becomes lower and the crystallinity decreases, which may be due to the increase in oxygencontaining functional groups within the hybrid membranes, enhancing the interactions between nanoparticles and polymers. 33 Therefore, the crystallinity of the composite membrane is reduced. Furthermore, with an increase in MXene@MOF-303 content in membrane, the peak at 2θ = 20°shifts to higher angles, which suggests that there are strong hydrogen bonds between PVA and MXene@MOF-303.…”

“…As the loaded MXene@MOF-303 content in membrane (M4 to M7 membrane) increases, the peak intensity at 3300 cm –1 increases. Because there are strong hydrogen bonds between PVA and MXene@MOF-303, the formation of hydrogen bonds would affect the absorption peak . The stretching vibrations at 2944 and 2915 cm –1 are symmetric and asymmetric peaks of the C–H bonds in PVA, respectively .…”

“…The reason may be that the content of MXene@MOF-303 nanocomposites added to PVA matrix is small, which is not enough to detect the new diffraction peaks. However, with the increase in the MXene@MOF-303 content, the peak at 2θ = 20° of hybrid membranes becomes lower and the crystallinity decreases, which may be due to the increase in oxygen-containing functional groups within the hybrid membranes, enhancing the interactions between nanoparticles and polymers . Therefore, the crystallinity of the composite membrane is reduced.…”