Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 325, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2023.122363
Keywords
Nitroaromatic compounds; Quantitation; Eosin Y; Catalytic reduction; Photobleaching kinetics; Colorimetric method
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In this study, a novel photocatalysis-based method was developed for the detection of nitroaromatic compounds (NACs), which demonstrated high sensitivity, low detection limit, and good anti-interference ability. This method provides a reliable and convenient approach for NACs detection.
The environmental and safety concerns caused by nitroaromatic compounds (NACs) require a sensitive, reliable, and easy-to-use method for their detection. In this work, we observed that an ultrafast photobleaching occurred when the photoreduction of NACs catalyzed by eosin Y (EY) was terminated. Based on such a semi-cycle photocatalysis, a colorimetric method was developed to quantify NACs with a linear relationship between the pseudo-first-order kinetic constant (kapp) of EY photobleaching and NACs concentration. This method exhibited a high sensitivity, low detection limit (6.57 ppb), and good anti-interference ability in the presence of various ions or organics in water matrices, enabling satisfactory quantification results for practical water samples. Moreover, the EY-based photocatalysis mechanisms inspires that the ultra-fast EY decoloration in the NAC solution was attributed to the fragment of the photoexcited EY molecule. This work provides a feasible photocatalysis-based NAC detection approach by applying a off-the-shelf probe.
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