Superhydrophilicity and underwater superoleophobicity TiO 2 /Al 2 O 3 composite membrane with ultra low oil adhesion for highly efficient oil-in-water emulsions separation
Superhydrophilicity and underwater superoleophobicity TiO 2 /Al 2 O 3 composite membrane with ultra low oil adhesion for highly efficient oil-in-water emulsions separation
复制标题
超亲水和水下超疏油TiO 2 /Al 2 O 3 复合膜具有超低油附着力，可高效分离水包油乳液
DOI：
10.1016/j.apsusc.2018.07.052
复制
发表时间：
2018
影响因子：
6.7
通讯作者：
Qunji Xue
中科院分区：
文献类型：
--
作者：
Dawei Zhang;Gang Wang;Shudi Zhi;Kaile Xu;Lijing Zhu;Wenwei Li;Zhixiang Zeng;Qunji Xue
为提高油包水乳液分离膜的分离效率，减少膜的污染，设计了一种超亲水、水下超疏油、超低油附着的TiO2/ al2o3复合膜。采用简单磁控溅射和水热氧化的方法在al2o3多孔陶瓷膜表面制备了tio2纳米棒阵列。二氧化钛纳米棒阵列涂层陶瓷膜的微观结构和表面光敏性可以有效提高油水分离效率，降低表面污染程度。二氧化钛纳米棒阵列层不仅缩小了传统陶瓷膜的孔径（增强了多孔结构的筛分效果），而且赋予其超亲水性（增强通量）和水下超疏油性（增强油水选择性和防污性）。基于陶瓷膜的超亲水性（水接触角（WCA）为0°）和水下超疏油性（油接触角（OCA）大于150°），油滴被膜阻挡（重力作用下油水分离效率99.1%），水将通过（重力作用下通量保持在41.8 L/(m2h)）。紫外线照射后的tio2纳米棒阵列涂层具有超低的油附着力（0.084 mN），具有优异的防污能力。这些特点，加上节能、低成本和易于规模化的制造方案，将在环境修复和废水净化方面具有很强的通用性和实用性。
To improve the separation efficiency and decrease fouling of the membranes used in oil-in-water emulsions separation, a superhydrophilic and underwater superoleophobic TiO2/Al2O3composite membrane with ultra low oil adhesion was designed. TiO2nanorod arrays were prepared on Al2O3porous ceramic membrane surface by simple magnetron sputtering and hydrothermal oxidation. The microstructure and surface photosensitivity of TiO2nanorod array-coated ceramic membrane can effectively increase the efficiency of oil-water separation and reduce the degree of surface fouling. The layer of TiO2nanorod arrays not only reduced the pore size of traditional ceramic membrane (enhanced sieving effect of porous structures) but also endowed its superhydrophilicity (enhanced flux) and underwater superoleophobicity (enhanced oil/water selectivity and antifouling). Based on the superhydrophilicity (water contact angle (WCA) of 0°) and underwater superoleophobicity (oil contact angle (OCA) higher than 150°) of ceramic membrane, oil droplets were blocked by the membrane (oil-water separation efficiency 99.1% under gravity) and water will pass (flux is maintained at 41.8 L/(m2h) under gravity). It also has excellent anti-fouling ability due to the ultra-low oil adhesion force (0.084 mN) of the TiO2nanorod array-coating after UV irradiation. These features, combined with energy-saving, low-cost and easy-to-scale manufacturing schemes will be of great versatility and practicality in environmental rehabilitation and wastewater purification.