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Fabrication of superhydrophilic and underwater superoleophobic membranes for fast and effective oil/water separation with excellent durability
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.memsci.2020.118898
Dai-Lin Zhou , Deng Yang , Di Han , Qin Zhang , Feng Chen , Qiang Fu

Abstract Oily wastewater has caused serve environmental pollution in nowadays, and it is highly urgent to develop an effective method for disposing of it. The development superhydrophilic and underwater superoleophobic (SUS) membranes bring hope of solving this global challenge. Previously, deformable hydrogels/hydrophilic polymers, brittle and chemically weak inorganic/metal oxides have been widely employed for fabricating SUS membranes, while most of these materials are likely to be corroded under practical severe conditions. In this work, we report a novel SUS membrane with excellent durability as achieved by introducing polyhedral oligomeric silsesquioxane (POSS) nanoparticles on cotton fabric (CF) followed by thiol-ene functionalization to graft hydrophilic carboxyl group. It is found that the prepared SUS membrane can withstand long-term mechanical abrasion, ultrasonic washing, UV light irradiation and corrosive aqueous solutions without reducing the underwater superoleophobicity. This SUS membrane is also able to separate various oil/water and oil/corrosive aqueous solution mixtures, and only water phase is allowed to permeate through it. The measured water fluxes are very high (up to 88,214 L m−2 h−1), the initial separation efficiencies of this membrane for various oil/water mixtures are over 99% and those values are still maintained at high level (around 98%) after 50 separation cycles even in severe conditions. We believe that this work would be helpful for fabrication of advanced SUS membranes with excellent durability.

中文翻译:

制造超亲水和水下超疏油膜,用于快速有效的油/水分离,并具有优异的耐久性

摘要 含油废水在当今造成了严重的环境污染,开发一种有效的处理方法迫在眉睫。超亲水和水下超疏油 (SUS) 膜的发展为解决这一全球性挑战带来了希望。以前,可变形水凝胶/亲水聚合物、脆性和化学性质较弱的无机/金属氧化物已被广泛用于制造 SUS 膜,而这些材料中的大多数在实际恶劣条件下可能会被腐蚀。在这项工作中,我们报告了一种具有优异耐久性的新型 SUS 膜,通过在棉织物 (CF) 上引入多面体低聚倍半硅氧烷 (POSS) 纳米粒子,然后硫醇-烯官能化接枝亲水性羧基来实现。研究发现,制备的 SUS 膜可以承受长期机械磨损、超声波清洗、紫外线照射和腐蚀性水溶液,而不会降低水下超疏油性。这种SUS膜还能分离各种油/水和油/腐蚀性水溶液混合物,只允许水相渗透。测得的水通量非常高(高达 88,214 L m-2 h-1),该膜对各种油/水混合物的初始分离效率超过 99%,并且这些值仍然保持在高水平(约 98% ) 即使在恶劣的条件下,也经过 50 次分离循环。我们相信这项工作将有助于制造具有优异耐久性的先进 SUS 膜。紫外线照射和腐蚀性水溶液不会降低水下超疏油性。这种SUS膜还能分离各种油/水和油/腐蚀性水溶液混合物,只允许水相渗透。测得的水通量非常高(高达 88,214 L m-2 h-1),该膜对各种油/水混合物的初始分离效率超过 99%,并且这些值仍然保持在高水平(约 98% ) 即使在恶劣的条件下,也经过 50 次分离循环。我们相信这项工作将有助于制造具有优异耐久性的先进 SUS 膜。紫外线照射和腐蚀性水溶液不会降低水下超疏油性。这种SUS膜还能分离各种油/水和油/腐蚀性水溶液混合物,只允许水相渗透。测得的水通量非常高(高达 88,214 L m-2 h-1),该膜对各种油/水混合物的初始分离效率超过 99%,并且这些值仍然保持在高水平(约 98% ) 即使在恶劣的条件下,也经过 50 次分离循环。我们相信这项工作将有助于制造具有优异耐久性的先进 SUS 膜。并且只允许水相渗透通过它。测得的水通量非常高(高达 88,214 L m-2 h-1),该膜对各种油/水混合物的初始分离效率超过 99%,并且这些值仍然保持在高水平(约 98% ) 即使在恶劣的条件下,也经过 50 次分离循环。我们相信这项工作将有助于制造具有优异耐久性的先进 SUS 膜。并且只允许水相渗透通过它。测得的水通量非常高(高达 88,214 L m-2 h-1),该膜对各种油/水混合物的初始分离效率超过 99%,并且这些值仍然保持在高水平(约 98% ) 即使在恶劣的条件下,也经过 50 个分离循环。我们相信这项工作将有助于制造具有优异耐久性的先进 SUS 膜。
更新日期:2021-02-01
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