纳米ZnO/TiO_2复合膜传感器的制备及其应用于地表水中化学需氧量测定的研究  

Preparation of the nano-ZnO/TiO_2 film sensor and the application in the detection of chemical oxygen demand

作　　者：袁园[1] 张中海[1] 方艳菊[1] 梁琳红[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：《化学传感器》2006年第4期23-27,共5页Chemical Sensors

基　　金：国家自然科学基金(No.20327001)资助课题

摘　　要：该文利用光催化氧化技术建立了一种测定地表水等低污染水体COD值的新方法。纳米ZnO/TiO2复合膜与单纯的纳米TiO2膜相比,提高了系统的电荷分离效率,扩展了其光谱响应范围,从而表现出更好的光催化效率。纳米ZnO/TiO2复合膜-Mn(Ⅶ)共存体系光催化降解水体中的有机物,COD值在0.3～10.0mg/L浓度范围内与信号成线性关系,检测限为0.1mg/L。将该方法用于实际水样的检测,测定结果与COD标准分析法有较好的一致性。A new method for determination of low COD value in surface water using the photocatalytic oxidation technology was described. The nano - ZnO/TiO2 film promoted the separate efficiency of the charge and extended the range of spectrum, then showed a higher photocatalytic efficiency than the single nano - TiO2 film. This method was originated from the direct determination of the Mn（ Ⅶ ） concentration change resulting from photocatalytic oxidation of organic compounds on the nano - ZnO/TiO2 film, and the COD values were calculated from the absorbance of Mn （ Ⅶ ）. Under the optimal operation conditions, the detection limit of 0. 1 mg/L, COD values with the linear range of 0. 3 - 10.0 mg/L were achieved. The results were in good agreement with those from the conventional COD methods.

关 键 词：化学需氧量(COD) 光催化氧化 纳米ZnO/TiO2复合膜传感器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]