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- Title
Dual Functional Si, N-Codoped Carbon Quantum Dots for Selective Fluorescence Sensing of Fe3+ and Visible-Light Photocatalysis of Organic Dyes.
- Authors
Wang, Yun; Fu, Guo; Li, Chunxing; Meng, Qin; Hu, Xiaoxi
- Abstract
This work reports a simple, low cost and eco-friendly one-step hydrothermal method to obtain Si- and N-doped carbon quantum dots (Si-N-CQDs) using only citric acid and (3-aminopropyl) trimethoxysilane. These codoped Si-N-CQDs demonstrated 0D spherical morphology and an average size of ∼ 2.54 nm as well as good solubility in water and high quantum yield equal to 14.3%. Fluorescence emission of these Si-N-CQDs was quenched selectively under the presence of Fe 3 + . Based on this property, we developed a very sensitive sensor capable of detecting Fe 3 + up to 400 μ M concentration with a 3.14 μ M detection limit. This sensor was used for Fe 3 + detection in real tap and lake water and demonstrated satisfactory recovery equal to 102.3–108.0% and 103.5–108.5%, respectively. Photocatalytic activity of our Si-N-CQDs was demonstrated using methylene blue (MB) organic dye. The degradation rate of MB under visible light irradiation increased 2.7 times under the presence of Si-N-CQDs within 60 min. Such excellent performance was attributed to very efficient light absorption of Si-N-CQDs as well as excellent electron transfer and separation of photogenerated charge carriers. 0D Si-N-CQDs nanoparticles were synthesized using a one-step hydrothermal process. As-synthesized carbon quantum dots demonstrated good selectivity and sensitivity to Fe3+ as well as a wide detection range. As-synthesized nanoparticles showed high photocatalytic activity towards MB. Photocatalytic degradation efficiency of MB with the assistance of metal-free Si-N-CQDs was increased by 88.5% after 60 min relative to the degradation without Si-N-CQDs assistance.
- Subjects
QUANTUM dots; ORGANIC dyes; FLUORESCENCE; PHOTOCATALYSIS; PHOTODEGRADATION; PHOTOCATALYSTS
- Publication
NANO, 2023, Vol 18, Issue 5, p1
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292023500340