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Abstract
Nitrite and sulfite play important roles in human health and environmental science, so it is desired to develop a facile and efficient method to evaluate NO2 - and SO3 2- concentrations. In this article, the use of green alternatives with the potential of multi-functionality has been synthesized to detect nitrite and sulfite based on fluorescent probe. The carbon dots (CDs) with starch as only raw materials show fluorescence turn “on-off-on” response towards NO2 - and SO3 2- with the limits of detection of 0.425 and 0.243 μМ, respectively. Once nitrite was present in the solution, the fluorescence of CDs was quenched rapidly due to the charge transfer. When sulfite was introduced, the quenching fluorescence of CDs was effectively recovered because of the redox reaction between NO2 - and SO3 2-, and thus providing a new way for NO2 - and SO3 2- detection. Owing to their excellent analytical characteristics and low cytotoxicity, the “on-off-on” sensor was successfully employed for intracellular bioimaging of NO2 - and SO3 2-.
Highlights
Nitrogen oxide is one of the primary pollutants from fuel combustion (Boningari and Smirniotis, 2016)
The morphology, surface functional groups, structure and composition of the carbon dots (CDs) were investigated by transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), Particle size analyzer (ZS nano 90) and X-ray photo-electric spectrometry (XPS)
The O 1s XPS spectrum of CDs can be decomposed into peaks at 531.8 and 532.9 eV corresponded to the C O and C-OH groups
Summary
Nitrogen oxide is one of the primary pollutants from fuel combustion (Boningari and Smirniotis, 2016). Sulfite is considered as a restricted food additive in various food preservatives and excessive amounts of sulfite in food and drinking water have been major concerns for public health (Zhang et al, 2014; Wang et al, 2021b). It can cause harmful effects on tissue and has been found to be associated with asthma, hypotension, chronic obstructive pulmonary diseases, cardiovascular and gastrointestinal pain (Joseph et al, 2015; Pan, 2019; Asaithambi and Periasamy, 2020; Heaviside et al, 2021). Developing a rapid, highly selective and water-soluble probe to realize the sequential detection of nitrite and sulfite ions is of great importance
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