Carbon quantum dot used for detecting arsenites, and method used for detecting arsenites with carbon quantum dot
A technology of carbon quantum dots and arsenite, which is applied in the field of surface chemistry and optical sensing, can solve the problems of insensitive detection of water samples and contain heavy metals, and achieve the effects of low detection cost, high sensitivity and easy operation.
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Embodiment 1
[0030] Preparation of nitrogen-sulfur-doped graphite-type carbon quantum dots (g-CNSQDs): 1 part of sodium citrate, 3 parts of urea and 5 parts of mercaptoethylamine were added to 24 parts of deionized water, and the solution obtained after stirring was placed in the reaction In a kettle, heat at 160°C for 30 minutes to obtain g-CNSQDs in the form of dark brown solid powder.
[0031] Carbon quantum dots SH-g-CNSQDs-NH 2 Preparation: 1 part of DDT (dithiothreitol, the same below) and 4 parts of g-CNSQDs were added to 20 parts of deionized water, stirred evenly, and the resulting solution was incubated under hydrothermal (65°C) conditions while stirring for 24 hours, and then dialyzed for 12 hours to obtain SH-g-CNSQDs-NH 2 .
[0032] Detection of arsenite in water samples: SH-g-CNSQDs-NH 2 Prepare an aqueous solution E with a mass fraction of 0.5% and a pH value of 7, and take 3ml for subsequent detection. Take 1-2 drops of the arsenite aqueous solution sample to be tested ...
Embodiment 2
[0034] Preparation of nitrogen-sulfur-doped graphite-type carbon quantum dots (g-CNSQDs): 1 part of sodium citrate, 3 parts of urea and 8 parts of mercaptoethylamine were added to 66 parts of deionized water, and the solution obtained after stirring was placed in the reaction In a kettle, heat at 160°C for 30 minutes to obtain g-CNSQDs in the form of dark brown solid powder.
[0035] Carbon quantum dots SH-g-CNSQDs-NH 2 Preparation: 1 part of DDT and 5 parts of g-CNSQDs were added to 20 parts of deionized water, and the resulting solution was stirred and incubated under hydrothermal (65°C) conditions for 24 hours, and then dialyzed for 12 hours to obtain SH- g-CNSQDs-NH 2 .
[0036] Detection of arsenite in water samples: SH-g-CNSQDs-NH 2 Prepare an aqueous solution E with a mass fraction of 1.5% and a pH value of 7, and take 4ml for subsequent detection. Take 1-2 drops of the arsenite aqueous solution sample to be tested (drinking water in a certain city, the arsenite con...
Embodiment 3
[0038] Preparation of nitrogen-sulfur-doped graphite-type carbon quantum dots (g-CNSQDs): 1 part of sodium citrate, 3 parts of urea and 3 parts of mercaptoethylamine were added to 8 parts of deionized water, and the solution obtained after stirring was placed in the reaction In a kettle, heat at 160°C for 30 minutes to obtain g-CNSQDs in the form of dark brown solid powder.
[0039] Carbon quantum dots SH-g-CNSQDs-NH 2Preparation: 1 part of DDT and 2 parts of g-CNSQDs were added to 24 parts of deionized water, stirred evenly, and the resulting solution was incubated under hydrothermal (65°C) conditions while stirring for 24 hours, and then dialyzed for 12 hours to obtain SH- g-CNSQDs-NH 2 .
[0040] Detection of arsenite in water samples: SH-g-CNSQDs-NH 2 Prepare an aqueous solution E with a mass fraction of 2% and a pH value of 7, and take 5ml for subsequent detection. Take 1-2 drops of the arsenite aqueous solution sample to be tested (industrial wastewater, the content ...
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