Abstract
Herein, a new hydrophilic and antibacterial polytetrafluoroethylene (PTFE) flat MF membrane was fabricated via a low-cost and simple preparation method in which chitosan (CS) was crosslinked with poly(vinyl alcohol) (PVA) using epichlorohydrin (ECH) as a cross-linker followed by in situ chimeric SiO2 nanoparticle adhesion. The surface of the modified membrane had decreased C and F contents, and a large number of hydrophilic groups appeared. The treated membrane had good hydrophilicity and antibacterial properties. Moreover, the PTFE-modified membrane had high separation efficiency and antifouling property for oil-in-water emulsions. Finally, the hydrophilic stability of the PTFE membrane was studied by subjecting it to continuous water rinsing and soaking in solutions of different pH values. The present study demonstrates that this modified membrane has potential practical applications in industrial wastewater recovery.
Highlights
With the increasing seriousness of environmental pollution caused by industrial wastewater and oil spills, research on oil/water separation is receiving signi cant attention in recent years;[1,2,3,4] there are many shortcomings, including low efficiency, high cost, and secondary pollution, of conventional oil–water separation technology;[5,6,7] among the oil–water separation techniques, membrane technologies are extensively used in water treatment due to their high space utilization, energy-saving nature, environmental friendliness and cost-effectiveness
In the past few decades, there have been two major methods of improving the hydrophilicity of PTFE membranes; one method involves the destruction of the C–F bond, and the gra ing of some hydrophilic groups;[17,18,19,20,21] the other method involves the application of a layer of hydrophilic coating directly on the membrane surface;[22,23] these two modi cation methods have some shortcomings
When ECH was added to a solution containing poly(vinyl alcohol) (PVA) and CS, PVA and CS were cross-linked via ECH to form a three-dimensional network of macromolecules, which was deposited and wrapped on the node and ber surface to form the PVA/C layer
Summary
In the past few decades, there have been two major methods of improving the hydrophilicity of PTFE membranes; one method involves the destruction of the C–F bond, and the gra ing of some hydrophilic groups;[17,18,19,20,21] the other method involves the application of a layer of hydrophilic coating directly on the membrane surface;[22,23] these two modi cation methods have some shortcomings. The cross-linking of PVA and CS with epichlorohydrin (ECH) reduces the water solubility of PVA and improves the antibacterial properties of the PTFE membrane. The objective of this study was to develop a simple and low-cost facile technique for the fabrication of membranes with signi cant hydrophilicity, antibacterial activity, and antifouling property. We introduced the PVA/CS hydrophilic layer into the bril surface of the PTFE membrane to improve the hydrophilicity and antibacterial properties of this membrane. To better improve the hydrophilicity of the modi ed PTFE at membrane, a secondary treatment was conducted on the PVA/CS compound coating. The oil-in-water emulsion separation, the antifouling properties and hydrophilicity stability of the modi ed PTFE at membrane were investigated. The PBA/ SiO2 solution was prepared by mixing the same quantity of A and B at 25 C
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
