Nano-Anatase-Enhanced Peroxyoxalate Chemiluminescence and Its Sensing Application

This paper reports a new nanosized anatase particle enhanced chemiluminescence sensor that utilizes the catalytic surface of anatase for sensitive detection of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). This chemiluminescence sensor was composed of anatase nanoparticles grafted with the nitrobenzoxadiazole (NBD) fluorophore, bis(2,4,6-trichlorophenyl)oxalate (TCPO), and hydrogen peroxide (H2O2). The chemiluminescence efficiency of the sensor has been greatly enhanced by 6 times compared with that in the absence of nano-anatase. However, 2,4-D could greatly suppress the chemiluminescence enhancement of anatase nanoparticles probably by adsorbing and competitively reacting with the activated hydrogen peroxide on the anatase surface. The phenomenon has been used to detect 2,4-D by monitoring the quenching of the chemiluminescence of the system. The limit of detection of the chemiluminescence sensor system was estimated to be as low as 0.33 nmol/L. The simple and sensitive sensor reported herein ex...

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