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Selective detection of Cu2+ using nitrogen-doped carbon dots derived from humic acid and urea based on specific inner filter effect.
- Source :
-
Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy . Dec2021, Vol. 263, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- [Display omitted] • Nitrogen-doped carbon dots were fabricated by a simple hydrothermal strategy. • N-CDs exhibited strong fluorescence property, stability and water solubility. • The sensor was endowed high sensitivity and selectivity for Cu2+ detection. • The sensor can be applied in weak acid and high salt environment. A new kind of nitrogen-doped carbon dots (N-CDs) was synthesized via a simple hydrothermal strategy using humic acid as the carbon source and urea as the nitrogen source. The fluorescence intensity of as-prepared N-CDs was quenched significantly in presence of Cu2+ based on a specific inner filter effect, which could be utilized to construct a selective sensor for monitoring Cu2+ in aqueous samples. The sensor exhibited good linearity over the range of 0.1–2 μM, and high sensitivity with a detection limit of 25 nM. Under the optimal conditions, there was no significant interference by other metal ions such as Cd2+, Al3+, Cr3+, Fe3+, Pb2+, Na+, Ni+, Fe2+, Ba2+, Ca2+, Co2+, Mg2+, As3+, K+, Zn2+ for Cu2+ detecting except Hg2+. The interference of Hg2+ can be masked by addition of sodium chloride. The experimental results demonstrated that the prepared N-CDs owned strong fluorescence, high monodispersity, good stability and good water solubility, and the constructed sensor had many advances and great application prospect in environmental field. [ABSTRACT FROM AUTHOR]
- Subjects :
- *HUMIC acid
*UREA
*CARBON
*TRACE metals
*NITROGEN
*DETECTION limit
*SALT
*METAL ions
Subjects
Details
- Language :
- English
- ISSN :
- 13861425
- Volume :
- 263
- Database :
- Academic Search Index
- Journal :
- Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy
- Publication Type :
- Academic Journal
- Accession number :
- 152163234
- Full Text :
- https://doi.org/10.1016/j.saa.2021.120136