引用本文: 李铭, 陈景业, 胡玉斐, 李攻科. 复合TiO2-Y2O3催化发光环氧丙烷气体传感器. 分析化学, 2019, 47(2): 191-197. doi: 10.19756/j.issn.0253-3820.181625 [复制]
Citation: LI Ming , CHEN Jing-Ye , HU Yu-Fei , LI Gong-Ke . Titanium Dioxide-Yttrium(Ⅲ)-Oxide Composite Based Cataluminescence Gas Sensor for Fast Detection of Propylene Oxide. Chinese Journal of Analytical Chemistry, 2019, 47(2): 191-197. doi: 10.19756/j.issn.0253-3820.181625 [复制]
复合TiO2-Y2O3催化发光环氧丙烷气体传感器
Titanium Dioxide-Yttrium(Ⅲ)-Oxide Composite Based Cataluminescence Gas Sensor for Fast Detection of Propylene Oxide
制备了TiO2-Y2O3纳米复合材料，并研究了环氧丙烷在其表面产生的催化发光现象，基于此，研制了环氧丙烷催化发光传感器。此传感器对丙酮、乙醛、苯等常见的挥发性有机物没有响应，显示出良好的选择性。对复合物的不同氧化物比例及烧结温度进行优化，得到TiO2与Y2O3质量比为1：3、烧结温度为500℃时，催化材料性能最佳。在最优实验条件下，即197℃、波长490 nm及载气流速0.3 L/min时，催化化学发光强度与环氧丙烷浓度在4.5~1375 mg/L范围内呈现良好的线性关系，检出限（3σ）为1.25 mg/L。此传感器具有灵敏快速、操作简便等优点，采用此传感器实时监测熏蒸谷物中环氧丙烷残留量，结果与气相色谱法吻合，相对偏差为2.7%~4.9%，显示出此传感器良好的性能。对环氧丙烷催化氧化的机理进行了初步探讨。
In this work, the cataluminescence (CTL) phenomenon of propylene oxide (PO) on the surface of nanocomposite TiO2-Y2O3 (titanium dioxide-yttrium(Ⅲ)-oxide) was studied. It was found that the nanocomposite had high sensitivity and good selectivity for the detection of PO. The common volatile organic compounds such as acetone, acetaldehyde and benzene showed no response to the catalysis of TiO2-Y2O3. Based on this phenomenon, a PO CTL sensor was designed. The ratio of TiO2 and Y2O3, and the sintering temperatures of the composites were optimized. It was found that when the mass ratio of TiO2 and Y2O3 was 1:3 and the sintering temperature was 500℃, the catalytic materials showed the best performance. The temperature, wavelength and carrier gas flow rate of the CTL system were also optimized, and 197℃, 490 nm and 0.3 L/min were selected as the optimal conditions. The quantitative analysis was performed under the optimized conditions and CTL intensity was linear with PO concentration in the range from 4.5 mg/L to 1375 mg/L with a detection limit (3σ) of 1.25 mg/L. The sensor was used for quantitative analysis and real-time monitoring of PO residues in fumigation cereals. The result obtained by this CTL sensor was consistent with that by gas chromatography. The CTL sensor proposed here had many merits such as high sensitivity, rapidity and simple operation, and had potential application prospects in the rapid detection of PO in food. In addition, the mechanism of catalytic oxidation of PO was discussed as well.
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复合TiO2-Y2O3催化发光环氧丙烷气体传感器
Titanium Dioxide-Yttrium(Ⅲ)-Oxide Composite Based Cataluminescence Gas Sensor for Fast Detection of Propylene Oxide
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