Metal-organic framework-based antifouling PVDF composite membranes with enhanced antifouling features for oil-water mixture
and emulsion separation Muhammad Fiaz, Manzar Sohail National University of Sciences and Technology, Pakistan
A novel composite membrane, UTP (UiO-66-NH 2 /Tannic acid/Polyvinylidene fluoride), was successfully synthesized using a facile in-situ deposition technique under a vacuum system. The surface of a flexible PVDF base membrane was coated with UiO-66-NH 2 particles, which were bound using the hydrophilic tannic acid (TA) as the binder. The resulting UTP membrane exhibits a rough surface with remarkable characteristics like it displays superhydrophilicity, and underwater superoleophobicity. The produced 10UTP membrane demonstrated remarkable efficiency in effectively separating various types of water-insoluble emulsified oils from water. It achieved an outstanding separation efficiency of over 99%, for a series of oil-water mixtures and emulsions. Water contact angle (WCA) was reduced to 3° for 30UTP from 121° for pristine PVDF membrane. Similarly, under water oil contact angle (UOCA) were 4° and 119° for pristine PVDF and 30UTP, respectively. This indicates the successful fabrication of superhydrophilic and underwater oleophobic composite membrane. The innovative UTP composite membrane's exceptional oil-water separation efficiency and advanced surface characteristics pave the way for sustainable water purification technologies, promising enhanced environmental remediation and industrial applications. References 1. Vihma, T., et al., The atmospheric role in the Arctic water cycle: A review on processes, past and future changes, and their impacts. Journal of Geophysical Research: Biogeosciences, 2016. 121 (3): p. 586-620. 2. Papa, F., et al., Water Resources in Africa under Global Change: Monitoring Surface Waters from Space. Surveys in Geophysics, 2023. 44 (1): p. 43-93. 3. Mekonnen, M.M. and A.Y. Hoekstra, Four billion people facing severe water scarcity. Science Advances. 2 (2): p. e1500323.
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