Application of Silicon Quantum Dots in the Detection of Formaldehyde in Water and Organic Phases

Author(s): Zhixia Zhang, Dan Zhao*, Yonghao Pang, Jian Hao, Xincai Xiao, Yan Hu.

Journal Name: Current Analytical Chemistry

Volume 15 , Issue 5 , 2019

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Abstract:

Background: Formaldehyde is widely acknowledged as a carcinogen, but as an important organic reagent, it has also been widely employed in the fields of chemical synthesis, industrial production and biomedicine. It is therefore of great practical significance for the detection of formaldehyde in food, clothing, daily necessities, construction materials and environments.

Methods: The two silicon QDs, that are, DAMO-Si-QDs (with N-[3-(Trimethoxysilyl) propyl] ethylenediamine as silicon source) and APTMS-Si-QDs (with (3-Aminopropyl) trimethoxysilane as silicon source) as the fluorescence probe to detect formaldehyde in both water and organic phases.

Results: Silicon QDs prepared by different silicon sources exhibit an obvious difference in their tolerances to the environment and the responses to formaldehyde. However, APTMS-Si-QDs show better selectivity in both water and organic phases. In Tris-HCl solution (20.00mmol•L-1, pH=5), the formaldehyde concentration maintains an excellent linear relationship with the fluorescence intensity of APTMS-Si-QDs in the range of 3.125×10-7-3.125×10-5 mol•L-1, with correlation coefficient R2= 0.9998. In methanol, the formaldehyde concentration maintains an excellent linear relationship with the fluorescence intensity of APTMS-Si-QDs in the range of 1.563×10-7-3.125×10-5 mol•L-1, with correlation coefficient R2= 0.9992.

Conclusion: It is found that DAMO-Si-QDs show poor response to the presence of formaldehyde, while APTMS-Si-QDs got a strong, sensitive and selective response to that in both aqueous and organic phases. In the Tris-HCl buffer (20 mmol•L-1, pH=5), the linear range for formaldehyde detection reaches 3.125×10-7-3.125×10-5 mol•L-1, and for the detection in the organic phase, the linear range reaches 1.563×10-7-3.125×10-5 mol•L-1, in methanol solution. The paper provides a sensitive, selective and simple means for formaldehyde detection in both aqueous and organic phase.

Keywords: Silicon quantum dots, formaldehyde detection, fluorescence, aqueous phase, organic phase, comparison.

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Article Details

VOLUME: 15
ISSUE: 5
Year: 2019
Page: [560 - 566]
Pages: 7
DOI: 10.2174/1573411014666180320153226
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