Fluorescence Quenching on PEG400-modified ZnS:Cu Quantum Dots and Herbicide Diquat

WANG Yanjun; ZHANG Fan

doi:10.19303/j.issn.1008-0384.2021.11.017

Volume 36 Issue 11

Nov. 2021

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Article Navigation > Fujian Journal of Agricultural Sciences > 2021 > 36(11): 1380-1386

WANG Y J, ZHANG F. Fluorescence Quenching on PEG400-modified ZnS:Cu Quantum Dots and Herbicide Diquat [J]. Fujian Journal of Agricultural Sciences，2021，36（11）：1380−1386 doi: 10.19303/j.issn.1008-0384.2021.11.017

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WANG Y J, ZHANG F. Fluorescence Quenching on PEG400-modified ZnS:Cu Quantum Dots and Herbicide Diquat [J]. Fujian Journal of Agricultural Sciences，2021，36（11）：1380−1386 doi: 10.19303/j.issn.1008-0384.2021.11.017

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Fluorescence Quenching on PEG400-modified ZnS:Cu Quantum Dots and Herbicide Diquat

doi: 10.19303/j.issn.1008-0384.2021.11.017

WANG Yanjun^{1, 2
,},
ZHANG Fan¹

1.
Fujian Polytechnic Normal University, Fuqing, Fujian　350300, China
2.
Modern Facility Agriculture of Fujian Provincial Higher Education Engineering Research Center, Fuqing, Fujian　350300, China

Received Date: 2021-08-16
Rev Recd Date: 2021-09-16
Publish Date: 2021-11-28

Abstract

Abstract

Objective Water-soluble PEG400-modified ZnS:Cu quantum dots (QDs) were prepared by hydrothermal method in search for an applicable rapid detection method on diquat. Method The QDs were characterized by their quenching intensities using a fluorescence spectrophotometer, an FTIR, and a UV-Vis spectrophotometer. Effect of PEG400 on the ZnS:Cu QDs was examined to determine the optimal modification for the establishment of a methodology to rapidly detect the toxicity of diquat on microorganisms. The correlation between QD quenching intensity and diquat concentration was examined for the methodology development. Result Under appropriate reaction conditions at the diquat concentration in the range of 1.45×10⁻⁶−8.7×10⁻⁶mol·L⁻¹, the fluorescence quenching degree of QDs had an excellent linear relationship with diquat concentration of a correlation coefficient of 0.999 9. The detection limit of the method was 2.071×10⁻⁷mol·L⁻¹. Conclusion The obtained PEG400-modified ZnS:Cu QDs was considered adequate to be applied for rapid detection of diquat in support of further development of related analytical methodology.
- ZnS: Cu quantum dots,
- PEG400 modification,
- fluorescence quenching,
- diquat

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References(32)

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