1. Novel translucent hollow fiber polyvinylidene fluoride photocatalytic membrane for highly efficient oil-produced wastewater treatment: The role of translucency on degradation efficiency.
- Author
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Kannathasan, Komathi, Jaafar, Juhana, Suhaimin, Nuor Sariyan, Jafri, Nurul Natasha Mohammad, Samitsu, Sadaki, Alias, N.H., Ismail, A.F., Matsuura, T., Othman, M.H.D., Rahman, Mukhlis A., Aziz, Farhana, Yusof, Norhaniza, Qtaishat, Mohammed Rasool, and Ismail, M.I.
- Subjects
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POLYVINYLIDENE fluoride , *HOLLOW fibers , *WASTEWATER treatment , *PHASE separation , *PHOTODEGRADATION - Abstract
A novel method, Thermally Modified Non-Solvent Induced Phase Separation (T-NIPS) has been developed to fabricate translucent hollow fiber (THF) photocatalytic membrane for membrane's photodegradation efficiency enhancement. The process involves two-step temperature treatment that attacks crystalline property of polyvinylidene fluoride (PVDF). Graphitic carbon nitride in a modified morphological structure (hollow nanofiber) was used as photocatalyst to investigate the effect of translucency on membrane's photodegradation efficiency. UV-Vis analysis coupled with FTIR highlighted different crystalline phase appearance and membrane's translucency. The membranes showed high translucency, ranging from 60.0% to 93.9%, with THF-PVDF/PVP-GCN (2.0) exhibiting the highest. The filtration experiment showed that membrane with GCN photocatalyst had high PWF (1200 L/m2h) and rejection (90%) OPW compared to neat THF-PVDFs. In suspended mode, GCN demonstrated an impressive photodegradation efficiency of 99.98%. When immobilized in opaque PVDF membrane, the photodegradation has decreased substantially to 49.40%. However, when immobilized in a translucent PVDF membrane, the photodegradation efficiency of HN-GCN significantly improved compared to the opaque PVDF membrane, reaching 95%. Translucent membrane was subjected to five cycle regeneration test and showed 90% recovery even after the fifth cycle. The 10% reduction in the recovery was investigated using FESEM analysis revealed that there is a cake layer formation on the membrane surface. Therefore, this study proved that translucency of membrane has significant effect on immobilized photocatalyst's photocatalytic efficiency. [Display omitted] • Novel T-NIPS method to produce THFM is developed. • HN-GCN successfully immobilized in THFM. • HN-GCN immobilized THFM showed increased degradation efficiency of OPW. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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