Structure Control and Interception Performance for Composite NF Membrane of CFGO@PVDF
By using polyvinylidene fluoride(PVDF)and carboxylated graphene oxide(CFGO)as raw materials,a highly hydrophilic and efficient desalination CFGO@PVDF composite nanofiltration membrane(GONF)was fabricated.By optimizing the preparation conditions and combining microscopic structure and morphology characterization,the optimal fabrication conditions for the GONF membrane were obtained,achieving a significant improvement in the performance of the composite nanofiltration membrane.The results showed that,compared to traditional PVDF nanofiltration membranes(CNF),the CFGO@PVDF composite nanofiltration membrane exhibited deeper pore channels and significantly enhanced hydrophilicity,with a pure water flux reaching 13.1 L/(m 2·h·bar)(1 bar=100 kPa),which was 2.5 times that of the CNF membrane.Additionally,the crystalline phase of the GONF membrane had been transformed from the α-phase to the β-phase,and the content of oxygen-containing functional groups on the membrane surface had increased,significantly enhancing the retention rate for different 2 g/L salt solutions,with the retention rates for Na2SO4 and MgSO4 being higher than 96％and 95％,respectively,without significant degradation within 60 minutes.This study successfully developed a high-water-flux,efficient and stable desalination CFGO@PVDF composite nanofiltration membrane,providing new insights into the design and fabrication of nanofiltration membranes,as well as offering an effective technical approach to solving global water treatment issues.
polyvinylidene fluoride(PVDF)carboxylated graphene oxide(CFGO)hydrophilicityseawater desalinationstructure control
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