Biomimetic Hierarchical TiO2@CuO Nanowire Arrays-Coated Copper Meshes with Superwetting and Self-Cleaning Properties for Efficient Oil/Water Separation
mediaposted on 18.12.2018, 00:00 authored by Junyi Ji, Huaqiang He, Chen Chen, Wei Jiang, Aikifa Raza, Tie-Jun Zhang, Shaojun Yuan
Creating a practical and energy-efficient method with high efficiency to separate oil–water mixtures and emulsions is essential for sustainable aquatic ecosystem and waste oil recycling. Herein, we reported a completely inorganic hierarchical TiO2@CuO nanowire array-coated copper mesh membrane fabricated using chemical oxidation and hydrothermal recrystallization. The biomimetic hierarchical nano/micro-structure can form a lotus-leaf-like interface with fine surface roughness and hydration ability, thus endows the membrane superhydrophilic and underwater superoleophobic nature. Thus, the as-synthesized TiO2@CuO nanowire array-coated copper mesh membrane demonstrates promising water flux of 87.6 kL h–1 m–2 and ultrahigh separation efficiency with oil residue of only 12.4 mg L–1 in the permeate. Moreover, the uniformly immobilized TiO2 nanoparticles exhibit UV-irradiated photocatalytic ability, which can be effectively regenerate the contaminated membrane after exposure to UV irradiations for 60 min. Therefore, this highly-efficient, reusable, and easy-scalable membrane fabrication strategy may possess practical potential for next-generation oil/water separation application.
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easy-scalable membrane fabrication strategywater fluxchemical oxidationBiomimetic Hierarchical TiO 2waste oil recyclingCuO Nanowire Arrays-Coated Copper MeshesSelf-Cleaning Propertiesultrahigh separation efficiencyTiO 2 nanoparticles exhibit UV-irradiated photocatalytic ability60 minas-synthesized TiO 2CuO nanowire array-coated copper mesh membranehydration abilitysurface roughnesslotus-leaf-like interfaceoil residuesuperoleophobic naturehydrothermal recrystallizationTiO 2UV irradiationsmembrane superhydrophilic