A novel method based on cross cataluminescence (CTL) generated on the surface of nano-3TiO2-2BiVO4 was proposed for simultaneous determination of benzene and formaldehyde in air. Two analysis wavelengths 470 nm and 600 nm were selected for this method. The surface temperature of sensing materials was 375 °C. The flow rate of air carrier was 135 mL/min. The limits of detection of this method were 0.12 mg/m3 for benzene and 0.05 mg/m3 for formaldehyde. The linear ranges of CTL intensity versus analyte concentration were 0.25-57.5 mg/m3 for benzene and 0.10-51.3 mg/m3 for formaldehyde. The recoveries of 5 testing standard samples by this method were 96.6-103.1% for benzene and 97.2%-102.8% for formaldehyde. Common coexistence matters, such as toluene, ethyl benzene, acetaldehyde, ethanol, ammonia, sulfur dioxide and carbon dioxide, did not disturb the determination. The relative deviation (RD) of CTL signals from continuous 120 h detection of gaseous mixture containing benzene and formaldehyde was less than 2%, which demonstrated the longevity and steady performance of nano-3TiO2-2BiVO4 to benzene and formaldehyde.
|Original language||English (US)|
|Number of pages||6|
|Journal||Sensors and Actuators, B: Chemical|
|State||Published - Oct 31 2014|
Bibliographical noteFunding Information:
This work was supported by Key Projects of Science and Technology Plan from Beijing Municipal Education Commission of China ( KZ201311417038 ), State 863 Projects ( 2014AA022002 ) and National International Cooperation Projects ( 2014DFA61040 ).
- Cross cataluminescence
- Gas sensor