Environment-Friendly Carbon Quantum Dots/ZnFe2O4 Photocatalysts: Characterization, Biocompatibility, and Mechanisms for NO Removal

2017 ◽  
Vol 51 (5) ◽  
pp. 2924-2933 ◽  
Author(s):  
Yu Huang ◽  
Yanling Liang ◽  
Yongfang Rao ◽  
Dandan Zhu ◽  
Jun-ji Cao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Environment Friendly ◽  
No Removal

Coral-Shaped TiO2−δ Decorated with Carbon Quantum Dots and Carbon Nanotubes for NO Removal

2021 ◽  
Author(s):  
Yucheng Ou ◽  
Gangqiang Zhu ◽  
Fei Rao ◽  
Jianzhi Gao ◽  
Jun Chang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
No Removal

Hydrothermal Synthesis of Carbon Quantum Dots from Persimmons as Probe for Determination of Ferric Ions

2021 ◽  
Vol 21 (3) ◽  
pp. 1728-1734
Author(s):  
Yingte Wang ◽  
Yujie Yang ◽  
Xiaoyue Chang ◽  
Rong Duan ◽  
Yong Zhang
Keyword(s):  
Quantum Dots ◽  
Spherical Shape ◽  
Average Diameter ◽  
Carbon Quantum Dots ◽  
Excitation Wavelength ◽  
Blue Fluorescence ◽  
Environment Friendly ◽  
Transmission Electron ◽  
Relative Standard

Local natural persimmons were used as a new precursor to synthesize carbon quantum dots (CQDs) by a brief and environment friendly strategy, hydrothermal method. The as-prepared CQDs were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, Ultraviolet-visible spectroscopy, as well as fluorescence spectrophotometer. The average diameter of CQDs was 2.5±0.5 nm with spherical shape and exhibited blue fluorescence with the maximum emission wavelength at 438 nm and excitation wavelength at 345 nm. The influences of pH and ionic strength on CQDs fluorescence were evaluated. Moreover, the CQDs were used for determination of Fe3+ by blue fluorescence quenching as the result of the interaction between Fe3+ and –OH, –COOH on the CQDs surfaces. The proposed CQDs displayed high selectivity and sensitivity of Fe3+ in comparison with other metal ions. Therefore, a good linear relationship was established with the Fe3+ concentration in the range of 0.6–400 μM. The correlation coefficient of the calibration curve was 0.996. The detection limit of the method was 0.56 μM. Eventually, the CQDs made from persimmons were used for determination of Fe3+ in actual water sample with satisfactory results and gave recoveries between 95.66% and 99.90%. The relative standard deviation was 1.20%–1.86%. The results demonstrated the potential towards diverse applications of the local persimmons.

One-Step Synthesis of Nitrogen and Chlorine Co-Doped Carbon Quantum Dots for Detection of Fe3+

NANO ◽  
2017 ◽  
Vol 12 (11) ◽  
pp. 1750135 ◽  
Author(s):  
Yin Zhong ◽  
Qi Chen ◽  
Junjian Li ◽  
Xihao Pan ◽  
Zhiwei Han ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Detection Limit ◽  
High Selectivity ◽  
Carbon Quantum Dots ◽  
High Quantum Yield ◽  
Environment Friendly ◽  
Glucosamine Hydrochloride ◽  
Quenching Efficiency ◽  
One Step ◽  
Co Doped

An environment friendly, economic and maneuverable hydrothermal method was proposed for fabrication of nitrogen and chlorine co-doped carbon quantum dots (N,Cl-CQDs). D-Glucosamine hydrochloride as the only precursor offered source of carbon, nitrogen and chlorine. As a consequent N,Cl-CQDs can emit blue luminescence and detect Fe[Formula: see text] by fluorescence response with high selectivity and sensitivity. There is a linear semilogarithmic correlation between the quenching efficiency [Formula: see text] and the concentration of Fe[Formula: see text] with a detection limit of 0.167 [Formula: see text]M. The N,Cl-CQDs exhibit a high quantum yield of 16.8% along with the fluorescence lifetime of 2.2[Formula: see text]ns. It is worth noting that the prepared N,Cl-CQDs show excellent biocompatibility and they are promising materials for sensing and biology.

LUMINESCENT DETERMINATION OF SUGAR IN NATURAL HONEY

2020 ◽  
Vol 0 (4) ◽  
pp. 29-32
Author(s):  
B.M. GAREEV ◽  
◽  
A.M. ABDRAKHMANOV ◽  
G.L. SHARIPOV ◽  
◽  
...  
Keyword(s):  
Quantum Dots ◽  
Laboratory Test ◽  
Aqueous Solutions ◽  
Analytical Method ◽  
Sugar Content ◽  
Carbon Quantum Dots ◽  
Photoluminescence Intensity ◽  
Sucrose Content ◽  
Natural Honey

The photoluminescence of carbon quantum dots synthesized from natural honey and mixtures of honey and sugar has been studied. An increase in the sugar content leads to a decrease in the photoluminescence intensity without changing the shape of the luminescence spectrum of these quantum dots aqueous solutions, which is associated with a decrease in the yield of their synthesis in the sugar presence. The discovered effect can be used to detect sugar in honey. When examining five different market samples of flower honey using this method, two of them showed a significant decrease in the photoluminescence intensity. A laboratory test for compliance with GOST 19792-2017 Standard requirements established an excess of the sucrose content in these samples. Luminescent determination of sugar in honey does not require complicated equipment and can be used to develop a new analytical method for determining the sugar content in counterfeit natural honey.

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