With the advantages of one-dimensional hollow structure, high porosity and prominent mechanical strength, single-walled carbon nanotubes (SWCNTs) have been extensively utilized to improve conventional filtration membranes for oil/water separation. Their intrinsic hydrophobicity, however, adversely affects the anti-fouling performance of the SWCNT membrane. Herein, a super-hydrophilic and underwater super-oleophobic hierarchical modified membrane with enhanced permeability and anti-fouling property was fabricated using the vacuum-assisted filtration technique by synergistically assembling SWCNTs and titanium dioxide (TiO 2 ) nanoparticles on a cellulose acetate membrane. Highly dispersed SWCNTs were obtained by carboxylating treatment of agglomerate SWCNTs. The controlled stacking of SWCNTs fibers and a controllable amount of TiO 2 rendered a modified membrane with high porosity and hierarchical structure, leading to an ultrahigh water flux up to 4,777.07 L·m −2 ·h −1 , and excellent separation performance with efficiency greater than 99.47%. Most importantly, the membrane exhibited excellent anti-fouling ability during ten cycles with the aid of the super-wetting property of TiO 2 nanoparticles. The results indicated that coating TiO 2 nanoparticles on SWCNTs modified the surface topography of the obtained SWCNT/TiO 2 membrane, which improved hydrophilicity, permeability and anti-fouling property, manifesting attractive potential applications in oil/water separation.

中文翻译：

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用于高效水包油乳液分离的超润湿 TiO2 修饰的单壁碳纳米管复合膜

凭借一维中空结构、高孔隙率和突出的机械强度等优点，单壁碳纳米管（SWCNTs）已被广泛用于改进传统的油水分离过滤膜。然而，它们固有的疏水性会对 SWCNT 膜的防污性能产生不利影响。在此，通过在醋酸纤维素膜上协同组装单壁碳纳米管和二氧化钛 (TiO 2 ) 纳米粒子，使用真空辅助过滤技术制造了一种具有增强渗透性和防污性能的超亲水和水下超疏油分层改性膜。高度分散的单壁碳纳米管是通过羧化处理团聚单壁碳纳米管获得的。SWCNTs纤维的可控堆叠和可控量的TiO 2 使改性膜具有高孔隙率和分级结构，导致超高水通量高达4,777.07 L·m -2 ·h -1 ，以及优异的分离性能和更高的效率超过 99.47%。最重要的是，借助TiO 2 纳米颗粒的超润湿特性，该膜在十次循环中表现出优异的防污能力。结果表明，在单壁碳纳米管上涂覆TiO 2 纳米颗粒改变了所得单壁碳纳米管/TiO 2 膜的表面形貌，提高了亲水性、渗透性和防污性能，在油水分离方面具有潜在的应用前景。优异的分离性能，效率大于99.47%。最重要的是，借助TiO 2 纳米颗粒的超润湿特性，该膜在十次循环中表现出优异的防污能力。结果表明，在单壁碳纳米管上涂覆TiO 2 纳米颗粒改变了所得单壁碳纳米管/TiO 2 膜的表面形貌，提高了亲水性、渗透性和防污性能，在油水分离方面具有潜在的应用前景。优异的分离性能，效率大于99.47%。最重要的是，借助TiO 2 纳米颗粒的超润湿特性，该膜在十次循环中表现出优异的防污能力。结果表明，在单壁碳纳米管上涂覆TiO 2 纳米颗粒改变了所得单壁碳纳米管/TiO 2 膜的表面形貌，提高了亲水性、渗透性和防污性能，在油水分离方面具有潜在的应用前景。