新型Au/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 novel Au/TiO_2 nanotube and its application in the detection of chemical oxygen demand

作　　者：梁琳红[1] 张中海[1] 袁园[1] 曾立平[1] 金利通[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《化学传感器》2008年第2期57-61,共5页Chemical Sensors

基　　金：国家自然科学基金(No.20327001)资助课题

摘　　要：该文首次用光电催化的方法,在TiO2纳米管中嵌入金纳米粒子,新材料可以促进界面间电子的传递,有助于电子和空穴对的分离,进而提高光催化效率。对Au/TiO2纳米管进行扫描电子显微镜(SEM),色散型X射线能谱(EDX)和X射线衍射(XRD)表征,结果表明金纳米粒子被成功嵌入TiO2纳米管中,形成蜂窝状结构。将该材料首次用于光电催化法化学需氧量(COD)的测定,发现该传感器的光电流值在1～800mg/L范围内与COD值有良好的线性响应,检测限为0.3mg/L。利用该传感器测定实际水样的COD值,结果与传统的K2Cr2O7标准方法有较好的一致性。A new method for fabrication of Au/TiO2 nanotube using photoelectrocatalysis was described. The Au/TiO2 nanotube promoted the transfer of interracial electrons and facilitated the separation of electron - hole （ e^- - h ^＋ ） pair, then showed higher photocatalytic efficiency compared to the single TiO2 nanotube. XRD, EDX and SEM techniques had been used to characterize the Au/TiO2 nanotube arrays. It was showed that Au nanoparticles were successfully encapsulated into highly ordered TiO2 nanotube and thus formed the honeycomb - like structure. This material can be used for chemical oxygen demand （COD） determination. Under the optimizing conditions, the sensor responded linearly to the COD in the range of 1 - 800 mg/L with the detection limit of 0.3 mg/L. The results were in good agreement with those from the conventional dichromate method.

关 键 词：Au/TiO2纳米管 光电催化 化学需氧量(COD) 光电流 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]