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.

Inactive Publication Date: 2017-06-20
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, surface-modified fluorescent carbon quantum dots are used to detect As(III) in water through fluorescence quenching or enhancement effects, but most of these quantum dots contain heavy metals, which are not suitable for low concentration (5-10ppb) As(III) water samples. Detection is not sensitive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a carbon quantum dot used for detecting arsenites, and a method used for detecting arsenites with the carbon quantum dot. The nitrogen sulfur-doped graphite-type carbon quantum dot (g-CNSQDs) is synthesized taking sodium citrate, urea, and aminoethyl mercaptan as templates, dithiothreitol (DTT) is used for surface grafting modification via hydrothermal cultivation so as to obtain a graphite-type fluorescent carbon quantum dot (SH-g-CNSQDs-NH2), wherein the surface of the graphite-type fluorescent carbon quantum dot (SH-g-CNSQDs-NH2) contains a large amount of mercapto groups and amino groups; combination of As (III) with SH-g-CNSQDs-NH2 is realized via the interaction of amino groups, mercapto groups, and arsenites, so that the fluorescence properties of SH-g-CNSQDs-NH2 are improved obviously, and detection on low concentration arsenites is realized. The carbon quantum dot contains no heavy metal; production cost is low; no toxic or side effect is caused; no secondary pollution on water quality samples is caused; operation is simple; and the carbon quantum dot can be used for sensitive and selective detection of low content As (III) water samples.

Description

technical field [0001] The invention relates to a carbon quantum dot for detecting arsenite and a method for detecting arsenite, belonging to the technical fields of surface chemistry and optical sensing. Background technique [0002] Arsenic is a non-metallic substance ubiquitous in the natural environment. It mainly comes from crustal rocks and minerals in natural resources, as well as organic arsenic pesticides and feed additives, mineral fuels, and industrial wastewater in artificial resources. The most serious hazard is the arsenic pollution of drinking water, which is carcinogenic. Arsenic is one of the most concerned substances in environmental pollution problems, and its high sensitivity and high selectivity detection technology in various environments is very important. In general, inorganic arsenic compounds are much more toxic than organic arsenic compounds and zero-valent arsenic, and arsenite is especially toxic, so it is important to detect arsenite in food an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/65G01N21/64B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/65B82Y20/00B82Y30/00B82Y40/00C09K11/025G01N21/643
Inventor 于得海罗通曹超阚吉磊王树发张献琨刘温霞王慧丽李国栋宋兆萍
Owner QILU UNIV OF TECH
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