阳极氧化疏松钛膜制备高光催化活性的透明TiO_2纳米多孔涂层

Preparation of Transparent TiO_2 Nanoporous Coating with Highly Photocatalytic Activity by Anodizing Ti Film with Loose Structure

采用磁控溅射法在玻璃基底上制备出一层特殊结构的Ti膜,该钛膜经过电化学阳极氧化和退火工艺处理,可直接在玻璃基底表面形成一层具有高光催化活性的透明TiO_2纳米多孔涂层(简称TNP涂层)。利用XRD和SEM对TNP涂层的结构和形貌特征进行了表征。利用紫外可见分光光度计、接触角测试仪以及划痕测试仪对该涂层的透光率、浸润性、结合力进行了测试。最后,通过降解亚甲基蓝溶液对该涂层的光催化活性进行了评价。结果表明:制备的TNP涂层具有疏松多孔结构,退火后可形成锐钛矿相,透光率在可见光范围内达到80%以上,表面具有超亲水性(接触角<6°),与玻璃基底间的结合力为2.9N;2h内对浓度为1×10-5 mol/L的亚甲基蓝溶液降解率可达到94%,光催化反应速率常数为1.47h-1。

The Ti film with special structure was deposited onto glass substrate by magnetron sputtering,then via the process of electrochemical anodization and annealing,a transparent TiO2 nanoporous coating（denoted as TNP）with high photocatalytic activity can be directly formed on glass substrate.The crystal structure of the TNP was detected by X-ray diffractometry（XRD）and the morphology of the coating was observed by scanning electron microscopy（SEM）.The transmittance,wettability and adhesion of TNP were investigated by UV-Vis spectrophotometer,contact angle meter and scratch tester respectively.Finally,the photocatalytic activity of TNP was evaluated by degradation of methylene blue solution under UV illumination.The results show that the prepared TNP coating has a nanoporous structure and only anatase can be found after annealing,the transmittance of TNP coating can reach 80% or more in visible region,with a super hydrophilic surface（contact angle〈6°）and the adhesion strength between TNP coating and glass substrate is 2.9N;the degradation rate for methylene blue（C0=1×10-5 mol/L）can reach 94%in 2hours and the photocatalysis reaction rate constant is 1.47h-1.