Abstract
A fluorescent carbon dots probe for the detection of aqueous nitrite was fabricated by a one-pot hydrothermal method, and the transmission electron microscope, X-ray diffractometer, UV–Vis absorption spectrometer and fluorescence spectrophotometer were used to study the property of carbon dots. The fluorescent property of carbon dots influenced by the concentration of aqueous nitrite was studied. The interaction between the electron-donating functional groups and the electron-accepting nitrous acid could account for the quenching effect on carbon dots by adding aqueous nitrite. The products of the hydrolysis of aqueous nitrite performed a stronger quenching effect at lower pH. The relationship between the relative fluorescence intensity of carbon dots and the concentration of nitrite was described by the Stern–Volmer equation (I0/I − 1 = 0.046[Q]) with a fine linearity (R2 = 0.99). The carbon dots-based probe provides a convenient method for the detection of nitrite concentration.
Highlights
Nitrite as an important oxynitride plays a significant role in the nitrogen cycle of the natural environment
A fluorescent carbon dots probe for the detection of aqueous nitrite was fabricated by a one-pot hydrothermal method, and the transmission electron microscope, Xray diffractometer, UV–Vis absorption spectrometer and fluorescence spectrophotometer were used to study the property of carbon dots
The results showed that aqueous nitrite performed a fierce quenching effect on the fluorescence of the carbon dots at lower pH
Summary
Nitrite as an important oxynitride plays a significant role in the nitrogen cycle of the natural environment. The usage of nitrite is constrained in physiological systems because the excessive ingestion of nitrite can lead to hazardous effects for human health, especially for children, the elderly and pregnant women [1,2,3,4,5]. Haemoglobin oxidation in blood, the formation of carcinogenic nitrosamines in the digestive system [6,7] and many diseases such as oesophageal cancer and blue baby syndrome [8,9,10] are all caused by an excess ingestion of nitrite. It is important to detect nitrite in the living environment to improve
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