Abstract Nowadays, the structural and functional deficiencies of ceramic membranes prepared by conventional approaches are of particular research of interest. In the present work, ceramic membrane was fabricated by constructing hierarchically structured separation layer on a porous alumina substrate. This layer was TiO 2 nano wires which synthesized by hydrothermal method followed by calcination at 550 °C to obtain the active anatase form. The synthesized TiO 2 nano wire was characterized by XRD, SEM, EDAX, TEM and UV–vis spectroscopy. The antibacterial activity of the synthesized TiO 2 nano powder was investigated against Escherichia coli bacteria by zone of inhibition test. To fabricate the ceramic membrane, the synthesized nano wire was sprayed on a porous sintered alumina substrate fabricated by gel-casting technique. Microstructure of TiO 2 /alumina ceramic membrane was investigated by SEM. XRD results revealed that the as-synthesized material at 200 °C was Na-titanate which transformed into H-titanate when neutralized with acid. After calcination at 550 °C, the formed phase was anatase nano wire. As indicated from TEM images, H-titanate long wires with 5–200 nm diameter and 5–25 µm length were obtained. After calcination, linear anatase nano wires with 10–50 nm thickness, 1–2 µm length and aspect ratio about 100 were detected. The TiO 2 nano wires exhibited bacterial activity toward E. coli with zone of inhibition equal 15 mm. Moreover, the fabricated alumina membrane had ideal microstructure which consists of three layers having gradual pore size and thickness. These layers were alumina support, interface layer, and TiO 2 nano wire layer.

中文翻译：

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锐钛矿纳米线的合成及其作为氧化铝膜功能顶层的应用

摘要 如今，通过传统方法制备的陶瓷膜的结构和功能缺陷是特别令人感兴趣的研究。在目前的工作中，通过在多孔氧化铝基板上构建分层结构的分离层来制造陶瓷膜。该层是TiO 2 纳米线，通过水热法合成，然后在550°C下煅烧以获得活性锐钛矿形式。通过XRD、SEM、EDAX、TEM和UV-vis光谱对合成的TiO 2 纳米线进行表征。通过抑菌圈试验研究了合成的TiO 2 纳米粉体对大肠杆菌的抗菌活性。为了制造陶瓷膜，将合成的纳米线喷涂在通过凝胶浇注技术制造的多孔烧结氧化铝基板上。通过SEM研究了TiO 2 /氧化铝陶瓷膜的显微结构。XRD 结果表明，在 200 °C 下合成的材料是钛酸钠，当用酸中和时会转化为 H-钛酸。在 550°C 煅烧后，形成的相是锐钛矿纳米线。如 TEM 图像所示，获得了直径为 5-200 nm 和长度为 5-25 µm 的 H-钛酸盐长线。煅烧后，检测到厚度为 10-50 nm、长度为 1-2 µm、纵横比约为 100 的线性锐钛矿纳米线。TiO 2 纳米线对大肠杆菌表现出细菌活性，抑菌圈等于15 mm。此外，制备的氧化铝膜具有理想的微观结构，由三层组成，具有逐渐的孔径和厚度。这些层是氧化铝载体、界面层和TiO 2 纳米线层。