Journal
DYES AND PIGMENTS
Volume 207, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2022.110739
Keywords
Mercury (II) ion; Fluorescence quenching; Sensors; Selectivity; Oligomeric carbon nitrogen
Funding
- Shanghai Ocean University
- Collaborative Innovation Center for Water Environment Security of Inner Mongolia Autonomous Region, China
- Key Research Program of Science and Tech- nology at Universities of Inner Mongolia Autonomous Region
- [A2-2006-00-200212]
- [XTCX003]
- [WES2021201]
- [NJZZ22588]
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A novel phosphorus-doped carbon nitride oligomer-based fluorescence sensor with needle-like nanostructures and terminal amino and hydroxyl functional groups was synthesized via hydrothermal reaction, showing selective quenching towards mercury (II) ions. The sensor achieved a minimum detection limit of 0.35 nmol L-1 in the range of 1-100 nmol L-1 and demonstrated sensitivity and accuracy in detecting mercury (II) ions in actual shrimp samples.
Selective and sensitive analysis of mercury (II) ions is a challenging topic in fluorescent sensors. Herein, we obtained a new selective mercury (II) ion fluorescence sensor by converting microscale hollow-tube-structured phosphorus-doped polymeric carbon nitride into phosphorus-doped carbon nitride oligomers with needle-like nanostructures by a hydrothermal reaction. The unique oligomeric microstructure and surface-rich terminal amino and hydroxyl functional groups of the fluorescence sensor synergistically endow it with selective quenching of mercury (II) ions. This phosphor-doped carbon nitride oligomer-based mercury (II) ion-selective fluorescence sensor achieves a minimum detection limit of 0.35 nmol L-1 in the range from 1-100 nmol L-1 (correlation coefficient of 0.9976) and a quantum yield of 16.6%. The detection of mercury (II) ions in actual shrimp samples demonstrated the sensitivity and accuracy of this fluorescence sensor. This work provides a new possibility for developing green and inexpensive mercury (II) ion-selective fluorescent sensors.
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