TiO_2纳米管的制备及其在化学需氧量测定中的应用研究  

Preparation of TiO_2 Nanotubes and Its Application in the Detection of Chemical Oxygen Demand

作　　者：方艳菊[1] 张中海[1] 袁园[1] 丁红春[1] 金利通[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《现代科学仪器》2006年第4期41-44,共4页Modern Scientific Instruments

基　　金：国家自然科学基金仪器专项(No.20327001)资助

摘　　要：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。High density, well ordered and uniform titanium oxide nanotube arrays were fabricated by electrochemical anodic oxidation on a pure titanium sheet. XRD and SEM techniques have been used to characterize the TiO2 nanotube arrays. It is showed that the TiO2 structure depends on the heating condition, the rutile phase of TiO2 appears when heating to 500℃. Titania nanotubes electrode can be used for chemical oxygen demand （COD） determination. Under the optimiz- ing conditions, the sensor responded linearly to the COD of D-glucose solution in the range of 20-800 mg/L, the detection limit is 10mg/L with a linear correlation coefficient of 0.9977. Its application in artificial wastewater analysis has achieved results in good agreement with those from the conventional dichromate method; meanwhile, the process requires no hypertoxic reagents and less analysis time, suggesting that it would be another appropriate method for COD determination in water assessment.

关 键 词：TIO2纳米管 化学需氧量(COD) 光电催化 光电流 

分 类 号：X832[环境科学与工程—环境工程] O614.411[理学—无机化学]