Abstract
A novel oxygen-doped g-C3N4 nanoplate (OCNP) structure that can serve as an efficient sulfadimethoxine (SDM) sensing platform has been developed. Taking advantage of its inherent oxygen-containing functional groups and 2D layered structure with π-conjugated system, OCNP exhibits effective radiative recombination of surface-confined electron-hole pairs and efficient π-π interaction with SDM. This causes rapid fluorescence response and thus ensures the fast and continuous monitoring of SDM. Based on the fluorescence experiments and band structure calculation, the mechanism of the SDM-induced quenching phenomenon was mainly elucidated as the photoinduced electron transfer process under a dynamic quenching mode. Under optimized conditions, the as-proposed nanosensor, which emitted strong fluorescence at 375 nm with an excitation wavelength at 255 nm, presents an excellent analytical performance toward SDM with a wide linear range from 3 to 60 μmol L−1 and a detection limit of 0.85 μmol L−1 (S/N = 3). In addition, this strategy exhibits satisfactory recovery varied from 94 to 103% with relative standard derivations (RSD) in the range 0.9 to 6.8% in real water samples. It also shows marked tolerability to a series of high concentrations of metals and inorganic salts. This strategy not only broadens the application of oxygen-doped g-C3N4 nanomaterial in antibiotic sensing field but also presents a promising potential for on-line contaminant tracing in complex environments.
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Funding
This work was supported by grants from the National Natural Science Foundation, China (No. 22006070 to L.L.), Natural Science Foundation of Jiangsu Province (No. BK20200715 to L.L.), Natural Science Foundation of Jiangsu Province (No. BK20200728 to X.Z.), and Natural Science Research Project of Jiangsu Higher Education Institutions (No. 19KJB150012 to L.L.).
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Wang, Q., Xu, C., He, H. et al. Salt-resistant nanosensor for fast sulfadimethoxine tracing based on oxygen-doped g-C3N4 nanoplates. Microchim Acta 188, 153 (2021). https://doi.org/10.1007/s00604-021-04800-6
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DOI: https://doi.org/10.1007/s00604-021-04800-6