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[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(2): 191-197. doi: 10.19756/j.issn.0253-3820.181625 shu

Titanium Dioxide-Yttrium(Ⅲ)-Oxide Composite Based Cataluminescence Gas Sensor for Fast Detection of Propylene Oxide

School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China

Received Date: 3 October 2018
Revised Date: 16 November 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21775167, 21475153, 21575167, 21675178) and the Natural Science Foundation of Guangdong Province, China (No. 2016A030313358).

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.
- Nano-titanium dioxide-yttrium (Ⅲ)-oxide,
- Propylene oxide,
- Cataluminescence,
- Gas sensor
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