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在纯钛表面采用电化学阳极氧化法制备有序的高密度TiO2纳米管阵列,对TiO2纳米管进行X射线衍射(XRD)和扫描电子显微镜(SEM)表征,结果表明氧化钛纳米管膜层的相结构与热处理有关,经500℃热处理后具有光催化活性的锐钛矿型。将其用于化学需氧量(COD)的测定,以葡萄糖为响应底物,考察了TiO2纳米管光电催化传感器的光电催化行为,结果发现该传感器的光生电流值与20～800mg/L范围的COD值有良好的线性响应,检测限为10mg/L,相关系数为0.9977。利用该传感器测定废水样品的COD值,结果与传统的K2Cr2O7法相吻合。用TiO2纳米管制备的传感器具有测试速度快,不需有毒、昂贵试剂等优点,具有广阔的应用前景。
An ordered high density TiO2 nanotube array was prepared on the surface of pure titanium by electrochemical anodic oxidation. XRD and SEM were used to characterize the TiO2 nanotubes. The results showed that the TiO2 nanotube layer Phase structure and heat treatment, after 500 ℃ heat treatment with photocatalytic activity of anatase. It was used for the determination of chemical oxygen demand (COD) and glucose as substrate. The photoelectrocatalytic activity of TiO2 nanotube photoelectrocatalytic sensor was investigated. The results showed that the photocathode current value of the sensor was in the range of 20 ~ 800mg / L COD value has a good linear response, the detection limit of 10mg / L, the correlation coefficient of 0.9977. Using this sensor to measure the COD value of waste water samples, the result is consistent with the traditional K2Cr2O7 method. The sensor prepared with TiO2 nanotubes has the advantages of fast test speed, no toxic and expensive reagents, and has broad application prospects.