Mesoporous Carbon Nanomaterial-Phytochemical Based Electro-active Composite Preparation and its Application for Selective Hydrazine Sensing

This work reports the preparation of a graphitized mesoporous carbon and a phytochemical; piperine based electro-active composite. The composite was chemically modified over a glassy carbon electrode, designated as GCE/GMC@pp. The GCE/GMC@pp exhibited a highly stable redox peak at E1/2 = 0.2 V vs. Ag/AgCl in pH 7 phosphate buffer solution (PBS). Further, the prepared electrode gave an exceptionally selective response towards Hydrazine (HyD) sensing at E0 = 0.235 V vs. Ag/AgCl. In addition, the sensor gave a linear response towards the changing HyD concentration from 10-90 μM with the limit of detection as 120 nM. To explore the practical applicability, the effect of interference with co-existing analytes like H2O2, Pb2+, Cd2+, NO2 3-, NO2 2-, Cr(II), Arsenic (Ars) were studied and an interference mitigated response was observed. Finally, a real sample of tap water was tested and appreciable recovery values were obtained. Overall, the prepared composite exhibited excellent electro-catalytic activity towards HyD and has great potential for the real time trace HyD detection.