Preparation of Fluorescent Carbon Quantum Dots and Its Application as Probe for Detection of Nitrate Ions

Xiaomei Huang; Xiang Deng

doi:10.3788/LOP56.071602

Journals >Laser & Optoelectronics Progress >Volume 56 >Issue 7 >Page 071602 > Article

Laser & Optoelectronics Progress
Vol. 56, Issue 7, 071602 (2019)

Preparation of Fluorescent Carbon Quantum Dots and Its Application as Probe for Detection of Nitrate Ions

Xiaomei Huang^1、2、* and Xiang Deng^1、2

Author Affiliations

¹ Department of Chemistry and Chemical Engineering, Sichuan University of Arts and Science, Dazhou, Sichuan 635000, China

² Sichuan Key Laboratory of Characteristic Plant Development Research, Dazhou, Sichuan 635000, China

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DOI: 10.3788/LOP56.071602 Cite this Article Set citation alerts

Xiaomei Huang, Xiang Deng. Preparation of Fluorescent Carbon Quantum Dots and Its Application as Probe for Detection of Nitrate Ions[J]. Laser & Optoelectronics Progress, 2019, 56(7): 071602 Copy Citation Text

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Characterization of fluorescent carbon quantum dots. (a) Fluorescence spectra of carbon quantum dots under different excitation wavelengths; (b) maximum excitation and emission spectra of carbon quantum dots; (c) XPS image of carbon quantum dots; (d) TEM image of carbon quantum dots

Fig. 1. Characterization of fluorescent carbon quantum dots. (a) Fluorescence spectra of carbon quantum dots under different excitation wavelengths; (b) maximum excitation and emission spectra of carbon quantum dots; (c) XPS image of carbon quantum dots; (d) TEM image of carbon quantum dots

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Fig. 2. Condition optimization of pH

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Fig. 3. Optimization of reaction time

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Fig. 4. Selective analysis

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Fig. 5. Detection results under different concentrations of NO3-. (a) Fluorescence spectra; (b) linear curve

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Interferenceion	Concentration /(mmol·L^-1 )	(I₀-I)/I₀ /%	Relativestandarddeviation /%	Interferenceion	Concentration /(mmol·L^-1 )	(I₀-I)/I₀ /%	Relativestandarddeviation /%
Cl^-	2	68.2	2.2	I^-	8	68.8	1.8
F^-	2	67.9	1.4	N $\begin{matrix} O_{2^{-}} \end{matrix}$	8	69.2	2.1
S $\begin{matrix} O_{4}^{2 -} \end{matrix}$	2	66.4	1.6	SCN^-	8	67.3	0.9
Br^-	4	67.0	2.8	P $\begin{matrix} O_{4}^{3 -} \end{matrix}$	8	65.5	2.3
CN^-	4	68.7	0.8	N $\begin{matrix} H_{4}^{+} \end{matrix}$	8	65.4	0.5
C $\begin{matrix} O_{3}^{2 -} \end{matrix}$	4	66.3	2.1	Cr³⁺	8	67.6	1.7

Table 1. Influence experiments of interference ions

Sample	Found /(μmol·L^-1)	Added N $\begin{matrix} O_{3}^{-} \end{matrix}$ /(μmol·L^-1)	Total found /(μmol·L^-1)	Relative standarddeviation /%	Recovery /%
1	6.7	5.050.0	11.9, 11.5, 11.455.8, 56.9, 57.2	2.31.3	98.0 99.9
2	9.2	5.050.0	14.7, 14.5, 14.060.4, 59.2, 58.7	2.51.5	104.0100.4

Table 2. Detection of NO3- in real water samples

Xiaomei Huang, Xiang Deng. Preparation of Fluorescent Carbon Quantum Dots and Its Application as Probe for Detection of Nitrate Ions[J]. Laser & Optoelectronics Progress, 2019, 56(7): 071602

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