Fu Wanlin, Dai Yunqian, Tian Jilan, Huang Chaobo, Liu Zhongche, Liu Ken, Yin Linzhi, Huang Fangfang, Lu Yingwei, Sun Yueming
School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu 211189, People's Republic of China.
Nanotechnology. 2018 Aug 24;29(34):345607. doi: 10.1088/1361-6528/aac9ab.
Developing a facile strategy to synthesize template-free TiO membrane with stable super-hydrophilic surface is still a daunting challenge. In this work, super-hydrophilicity (close to 0°) and underwater super-oleophobicity (165°) have been successfully demonstrated on a hierarchical AlO/TiO membrane, which is prepared via a facile electrospinning method followed by simple calcination in air. The precisely-tuned AlO heterojunctions grew in situ and dispersed uniformly on the TiO surface, resulting in an 'island in the sea' configuration. Such a unique feature allows not only achieving super-hydrophilicity by maximizing the surface roughness and enhancing the hydrogen bonding, but also improving the adsorption capacity toward different toxic dyes utilizing the abundant adsorption sites protected by the hierarchical nanostructure during sintering. The new AlO/TiO nanofibrous membrane can serve as a novel filter for gravity driven oil/water separation along with dye removal, achieving 97.7% of oil/water separation efficiency and 98% of dye capture, thanks to their superb wettability and the sophisticated adsorptive performance. Our presented fabrication strategy can be extended to a wide range of ceramic materials and inspires their advanced applications in water purification under harsh liquid-phase environments.
开发一种简便的策略来合成具有稳定超亲水表面的无模板TiO膜仍然是一项艰巨的挑战。在这项工作中，通过简便的静电纺丝方法制备了分级AlO/TiO膜，然后在空气中进行简单煅烧，成功地在该膜上证明了超亲水性（接近0°）和水下超疏油性（165°）。精确调谐的AlO异质结原位生长并均匀分散在TiO表面上，形成“海中孤岛”结构。这种独特的特性不仅可以通过最大化表面粗糙度和增强氢键来实现超亲水性，还可以利用烧结过程中分级纳米结构保护的丰富吸附位点提高对不同有毒染料的吸附能力。新型AlO/TiO纳米纤维膜可作为一种新型过滤器，用于重力驱动的油/水分离以及染料去除，由于其出色的润湿性和复杂的吸附性能，实现了97.7%的油/水分离效率和98%的染料捕获率。我们提出的制造策略可以扩展到广泛的陶瓷材料，并激发它们在苛刻液相环境下的水净化中的先进应用。
