本项目对微流控光催化电化学检测技术进行了系统研究。采用溶胶-凝胶法合成了系列纳米晶TiO2材料，并采用XRD、UV、FL、SEM和电化学阻抗谱进行了表征；建造了一套纳米晶TiO2薄膜电极光电催化特性的评价装置，提出一种新的吸附常数的测定方法。最后研制了一种基于微流控光电催化原理测定COD的新仪器。该仪器的其创新点如下：1基于微流控原理的新型流通池，可以实现有机物的快速完全氧化。2 新型紫外光源不仅结构紧凑、光强稳定、寿命长、强度大，而且输出功率连续可调。3 研制的纳米晶TiO2薄膜电极稳定性好，光催化活性高。4 建立的COD测定新方法具有直接、快速、准确、无二次污染的特点。

This project focuses on the study of microfluidic system with photoelectrochemical detection. A series of nanocrystaline TiO2 material has been prepared using sol-gel technique, characterized by XRD,UV,FL,SEM and EIS. A experimental setup was established for the evaluation of photoelectrochemically catalytic propertes of nanocrystaline film electrodes and the determination of adsorption constants. Finally, a novel instrument for the assay of COD has been developped, which was based on the microfluidic photoelectrochemical detection principle. The outstanding features of the instrument are as follows: Firstly, a novel flowthrough thin-layer cell was designed for complete oxidation of organics. secondly, a new UV-led radiation resouce was developped, which featured compactness,steady and strong intense, long lifetime, as well as tunable output power. Thirdly，the self-made nanocrystaline film electrodes possess the advantages of high stablity and catalytic ability. Finally, a new COD assay method was established using the present instrument. This method is not only rapid, direct and acurrate, but also does not bring about secondary pollution.

本项目对微流控光催化电化学检测技术进行了系统研究。采用溶胶-凝胶法合成了系列纳米晶TiO2材料，并采用XRD、UV、FL、SEM和电化学阻抗谱进行了表征；建造了一套纳米晶TiO2薄膜电极光电催化特性的评价装置，提出一种新的吸附常数的测定方法。最后研制了一种基于微流控光电催化原理测定COD的新仪器。该仪器的其创新点如下：1基于微流控原理的新型流通池，可以实现有机物的快速完全氧化。2 新型紫外光源不仅结构紧凑、光强稳定、寿命长、强度大，而且输出功率连续可调。3 研制的纳米晶TiO2薄膜电极稳定性好，光催化活性高。4 建立的COD测定新方法具有直接、快速、准确、无二次污染的特点。