AI Article Synopsis
- Researchers discovered that carbon dots (CDs) made from urea and citric acid react with sulphide ions by changing color.
- They developed a new, eco-friendly method to detect trace levels of sulphide ions in wastewaters, with effective response ranges for both low and high concentrations.
- An automatic pretreatment system was created to help separate and identify sulphide ions in complex liquid mixtures used in desulphurization processes.
Article Abstract
In the research of carbon dots (CDs) containing various nitrogen sources, it was first found that urea/citric acid-CDs showed a selective discolouration reaction with sulphide ions. Therefore, by optimizing various synthesis and detection conditions of the CDs determining sulfur ions, such as the raw material ratio, temperature, time, pH, and oxidation atmosphere in the CD synthesis, a discolour CD-probe method for trace-level sulphide ions was developed. The method is environmentally friendly, shows two linear-response ranges in 0.050-1.0 mg L ( = -0.0827 + 0.8366) and 1.0-15 mg L S ( = -0.0209 + 0.7587) and can be used for the high and low concentration quantification of sulphide in various wastewaters. Subsequently, in order to realize the separation and detection of sulphide ions in wastewaters or rich- and barren-liquids containing -methyldiethanolamine and other substances in desulphurizing solutions, an automatic pretreatment system was also established.
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| http://dx.doi.org/10.1039/d1an01851e | DOI Listing |
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