中文摘要：

在微流控芯片中利用二氧化钛/过氧化氢（TiO2/H2O2）催化体系进行有机物的光催化降解及环境水样重金属分析。通过在微流控芯片中涂覆多孔纳米TiO2涂层,并以UV-LED为光源,制备光催化微反应器。以H2O2为光催化氧化剂,在光强为80mW/cm2,流速为1000μL/h,H2O2浓度为8%时,光反应时间为19s的条件下,0.2mmol/L亚甲基兰降解率可达99.6%。将此方法应用于含富里酸水样中Cd2＋和Zn2＋含量的测定,水样中2.5g/L富里酸可在96s内基本降解完全,释放出被吸附的Cd2＋和Zn2＋,实现准确测定。本方法具有降解效率高,二次污染少,分析速度快等优点,在环境水样分析中有较好的应用前景。

英文摘要：

A microreaction system based on microfluidic chip for photodegradation of organic pollutants and environmental analysis with TiO2/H2O2 catalyst system has been developed. In this system, a porous TiO2 layer was immobilized on the inner wall of the microchip, a UV-LED was employed as the light source, H2O2 acts as both electron acceptor and oxidant in the photodegradation of methylene blue（MB） process. Under the condition of incident light intensity of 80 mW/cm2, flow rate of 1000 μL/h, CH2O2 8% and effective residence time of 19 s, the degradation rate of 0.2 mmol/L MB reached to 99.6%. The method was applied for the environmental analysis with quelate Cd（Ⅱ）-Fulvic acid and Zn（Ⅱ）-Fulvic acid as a model system. The voltammetric wave of Cd（Ⅱ） and Zn（Ⅱ） was effectively suppressed in the presence of Fulvic acid in excess. Significant acceleration of the recovery of the Cd（Ⅱ） and Zn（Ⅱ） signal after UV irradiation was observed, and complete recovery of the Cd（Ⅱ） and Zn（Ⅱ） signal was achieved after a photoreaction time of 96 s in the photoca-talytic microreactor.