Hierarchically grown novel CeO ₂ /GO on nylon filter with enhanced hydrophilicity and permeation flux for oil-water separation Naseer Ahmad, Dilshad Hussain University of Karachi, Pakistan The removal of contaminants from water is crucial to safeguard the global water supply chain. Water purification using membrane technology is an effective and energy-efficient solution, and graphene oxide (GO) appears to be a promising candidate for the development of advanced membranes that offer tunable permeation parameters. In this study, porous CeO 2 /GO structures are hierarchically grown on a nylon filter using a vacuum coating, crosslinked with ethylenediamine (EDA), and employed for the removal of methylene blue (MB) dye and oil-water separation. The utilization of EDA as a crosslinker leads to a durable interaction between the nylon filter, CeO 2 nanoparticles, and GO. The CeO 2 /GO-nylon filter displays better hydrophilicity, antifouling, and superoleophobicity properties. The increased underwater superoleophobicity is caused by the addition of hydrophilic CeO 2 nanoparticles, which increase the surface roughness of the membrane. Embedding CeO 2 nanoparticles at different ratios results in good hydrophilicity and assists the fast water permeation with an enhanced flux rate of up to 6451 L m -2 h -1 for pure water and 484.85 L m -2 h -1 for oil-water emulsions. The designed CeO 2 /GO-nylon filter exhibits excellent oil rejection rates (99%) for various oil-water emulsions. Additionally, the presence of abundant functional groups on its surface enables the efficient removal of methylene blue dye (99.8%) from water through electrostatic, hydrogen bonding, π-π interactions, and pore-filling mechanisms. The designed strategy not only provides a simple approach for creating a membrane with exceptional water purification capabilities but also paves the way for advancing membranes with diverse applications in energy and the environment. References 1. Li, J., et al., A prewetting induced underwater superoleophobic or underoil (super) hydrophobic waste potato residue-coated mesh for selective efficient oil/water separation. Green Chemistry, 2016. 18 (2): p. 541-549. 2. Liu, Y.n., et al., A bifunctional β-MnO2 mesh for expeditious and ambient degradation of dyes in activation of peroxymonosulfate (PMS) and simultaneous oil removal from water. Journal of Colloid and Interface Science, 2020. 579 : p. 412-424. 3. Ma, W., et al., Durable, self-healing superhydrophobic nanofibrous membrane with self-cleaning ability for highly-efficient oily wastewater purification. Journal of Membrane Science, 2021. 634 : p. 119402. 4. Lu, T., et al., Multistructured Electrospun Nanofibers for Air Filtration: A Review. ACS Applied Materials & Interfaces, 2021. 13 (20): p. 23293-23313. 5. Hu, J., et al., Dynamic demulsification of oil-in-water emulsions with electrocoalescence: Diameter distribution of oil droplets. Separation and Purification Technology, 2021. 254 : p. 117631. 6. Zhao, C., et al., Application of coagulation/flocculation in oily wastewater treatment: A review. Science of The Total Environment, 2021. 765 : p. 142795. 7. Mekonnen, M.M. and A.Y. Hoekstra, Four billion people facing severe water scarcity. Science advances, 2016. 2 (2): p. e1500323.Su, Y., et al., Advanced Electrospun Nanofibrous Materials for Efficient Oil/Water Separation. Advanced Fiber Materials, 2022. 4 (5): p. 938-958. 8. Feng, L., et al., A dual-functional layer modified GO@SiO(2) membrane with excellent anti-fouling performance for continuous separation of oil-in-water emulsion. J Hazard Mater, 2021. 420 : p. 126681 9. Liu, Y., et al., A multifunctional hierarchical porous SiO2/GO membrane for high efficiency oil/water separation and dye removal. Carbon, 2020. 160 : p. 88-97.
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