微弧氧化法在多孔钛基体表面制备TiO2涂层及光催化性能研究

 多孔TiO₂是迄今最有效的光催化剂,具有安全、稳定、无二次污染等特点。但多孔TiO₂使用的最大问题是悬浮体系难以回收。将多孔TiO₂固定于载体上,制成负载型光催化反应器是目前主要的研究方向。本文以100μm钛珠为原材料,在真空条件下烧结制备多孔钛,采用微弧氧化(MAO)的方法,以磷酸钠溶液为电解液,在多孔钛基体上制备了TiO₂涂层;并用XRD、SEM和Raman手段对TiO₂涂层进行表征。结果表明,TiO₂涂层的晶型为锐钛矿,形貌呈现典型的微弧氧化多孔结构,孔径尺寸为1—2μm。紫外光照射条件下测量了TiO₂涂层对罗丹明B溶液的降解能力,发现在紫外线照射90min后,罗丹明B的降解率达到80%。

Compounding Porous Titanium Dioxide Film in Porous Titanium by Using Micro-Arc Oxidation and Photocatalyst

With the development of technology, a variety of new organic compounds are emerging. It is difficult to handle many of the organic compounds by the traditional physical and chemical methods, and it is easy to cause the secondary pollution, which requires us to find an effective way to deal with these refractory organics. Load type porous titanium dioxide is a kind of good photocatalystic which is stable and high optical efficient and is easy to be recycled and does not produce secondary pollution, etc. Therefore, it is widely known. 100μm titanium beads is used as raw materials, in vacuum sintering porous titanium preparation conditions, adopting Micro-Arc Oxidation (MAO) method, sodium solution is used as the electrolyte, titanium dioxide coating is prepared on porous titanium matrix. By means of XRD, SEM, and Raman test, titanium dioxide coating is characterized. The results show that the titanium dioxide coating of crystal is sharp titanium ore, its morphology has a characteristic micro-arc oxidation porous structure, and the size of aperture is 1μm—2μm. Under the condition of UV light, the degradation ability of titanium dioxide coating to Rhodamine B solution is measured, it is found that the after 90 minutes of ultraviolet ray radiation, the Rhodamine B degradation rate reaches at 80%.