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对经过不同预处理的钛片进行真空热氧化处理,在表面原位制得了TiO2纳米线。利用场发射扫描电子显微镜(FE-SEM)、高分辨透射电子显微镜(HR-TEM)和X射线衍射仪(XRD)对原位制备的TiO2纳米线的表面形貌及相结构进行表征,并通过降解水中染料罗丹明B的方式对经不同时间热氧化处理后酸洗钛片的光催化性能进行测试。薄膜结构表征结果表明,一定真空条件下钛片750℃热氧化5～10 h后可以获得大量直径40～50 nm,长度3.0～5.0μm的单晶金红石结构TiO2纳米线;使用H2 O2氧化钛片表面预先获得一层多孔非晶TiO2薄层显著影响纳米线的生长。光催化性能测试结果表明,真空热氧化处理1 h获得的扁平片状纳米结构金红石具有最高的光催化降解罗丹明B的能力;处理时间从5 h延长到10 h,得到的纳米线金红石薄膜的光催化性能提高。
After different pretreatment of the titanium plate vacuum thermal oxidation process, in situ prepared TiO2 nanowires in the surface. The surface morphology and phase structure of the prepared TiO2 nanowires were characterized by field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM) and X-ray diffraction (XRD) Degradation of rhodamine B in water was used to test the photocatalytic performance of pickled titanium sheets after thermal oxidation at different time. The results of the film structure characterization show that a large amount of monocrystalline rutile TiO2 nanowires with a diameter of 40-50 nm and a length of 3.0-5.0 μm can be obtained by thermal oxidation of titanium under 750 ℃ for 5-10 h under a certain vacuum condition. Obtaining a thin layer of porous amorphous TiO2 on the surface significantly affects the growth of the nanowires. The results of photocatalytic activity test showed that the flat sheet-shaped nanostructured rutile obtained by vacuum thermal oxidation treatment for 1 h had the highest ability of photocatalytic degradation of rhodamine B; the treatment time was prolonged from 5 h to 10 h, and the obtained nanowire rutile thin film Photocatalytic performance increased.