光催化氧化法测定地表水化学需氧量的研究

摘要/Abstract

用溶胶-凝胶法在石英管上制备了纳米TiO₂膜, 并采用光催化氧化法建立了一种测定地表水化学需氧量(COD)的新方法. 以Ce(IV)作为纳米TiO₂光生电子的接受体, 从而减少了纳米TiO₂光生电子和光生空穴的复合, 提高纳米TiO₂的光催化氧化能力. 以测定Ce(IV)的紫外吸收为手段探讨了光催化氧化测定COD的机理, 考察了测定COD的最佳反应条件. 实验结果表明, 该方法条件温和, 不会造成二次污染, 能够实现地表水等低COD值水样的快速准确测定. 在该实验所选择的条件下, 可准确地测定1.0～12 mg?L^－1之间的COD值, 检测限为0.4 mg?L^－1.

关键词: 化学需氧量(COD), 光催化氧化, 纳米TiO₂膜, Ce(IV)

A photocatalytic oxidation method for the detection of the chemical oxygen demand (COD) of the ground water using sol-gel-based nano-TiO₂ film, which was coated onto the quartz tube, was proposed. In this method, the photo-exited conduction band electrons released from illuminated nano-TiO₂ film could be easily accepted by Ce(IV) to enhance the activity of photocatalytic degradation of organic compounds. Therefore, the COD of a given sample can be assessed by determination of the change of the concentration of Ce(IV). Under the optimum operation conditions, the determination range of COD was 1.0～12 mg•L^－1 and the limit of detection was 0.4 mg•L^－1. This method was also applied to the determination of the COD of ground water samples. The results were in good agreement with those from the conventional (i.e., permanganate) COD methods.

Key words: chemical oxygen demand, photocatalytic oxidation, nano-TiO₂ film, Ce(IV)

引用此文

丁红春,柴怡浩,张中海,鲜跃仲,潘振声,金利通. 光催化氧化法测定地表水化学需氧量的研究[J]. 化学学报, 2005, 63(2): 148-152.

DING Hong-Chun,CHAI Yi-Hao,ZHANG Zhong-Hai,XIAN Yue-Zhong,PAN Zhen-Sheng,JIN Li-Tong*. Investigation of Photocatalytic Oxidation for Determination of Chemical Oxygen Demand of the Ground Water[J]. Acta Chimica Sinica, 2005, 63(2): 148-152.

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