1. Selective detection of Cu2+ using nitrogen-doped carbon dots derived from humic acid and urea based on specific inner filter effect.
- Author
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Sheng, Xueying, Li, Shuangying, Zhan, Yali, Guo, Jinghan, Zhou, Boyao, Zhao, Jingyi, Li, Zhi, Liu, Menghua, Li, Yanhui, Qu, Tongxu, and Zhou, Qingxiang
- Subjects
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HUMIC acid , *UREA , *CARBON , *TRACE metals , *NITROGEN , *DETECTION limit , *SALT , *METAL ions - 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]
- Published
- 2021
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