Sulfur-nitrogen-doped carbon quantum dot, preparation method thereof and application of sulfur-nitrogen-doped carbon quantum dot in mercury ion detection

A technology of carbon quantum dots and mercury ions is applied in the field of metal ion detection, which can solve the problem of high equipment cost and achieve the effects of high sensitivity, less spectral interference and good water solubility.

Pending Publication Date: 2021-08-27
GUANGDONG PHARMA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to, aiming at the above-mentioned deficiencies of the prior art, provide a kind of carbon quantum dots doped with sulfur and nitrogen and its preparation method, the carbon quantum dots co-doped with sulfur and nitrogen synthesized by one-step hydrothermal method are used as fluorescent probes , which overcomes the problems of high equipment cost, complicated operation, and environmental hazards of the traditional mercury ion detection method, and has the advantages of simple preparation method, fast and convenient detection, and accurate results.

Method used

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  • Sulfur-nitrogen-doped carbon quantum dot, preparation method thereof and application of sulfur-nitrogen-doped carbon quantum dot in mercury ion detection
  • Sulfur-nitrogen-doped carbon quantum dot, preparation method thereof and application of sulfur-nitrogen-doped carbon quantum dot in mercury ion detection
  • Sulfur-nitrogen-doped carbon quantum dot, preparation method thereof and application of sulfur-nitrogen-doped carbon quantum dot in mercury ion detection

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: The carbon quantum dots doped with sulfur and nitrogen provided by this implementation and its preparation method and application, the specific steps include:

[0036] 1) Dissolve 1 g of citric acid and 0.68 g of dimercaptosuccinic acid in 30 mL of pure water, then add 10 mL of concentrated ammonia water to adjust the pH of the solution to alkaline to fully dissolve the dimercaptosuccinic acid to obtain solution A;

[0037] 2) Transfer solution A to a polytetrafluoroethylene lining, then put it into a stainless steel reactor and react at 150°C for 180 minutes to obtain solution B;

[0038] 3) transfer solution B to a 1000D dialysis bag, and dialyze for 48 hours to obtain solution C;

[0039] 4) Suction filter solution C with a 0.45 μm organic filter, then freeze at -60°C for 4 hours, and vacuum-dry for 12 hours to obtain D(S,N-CQDs) in the form of yellow-brown powder. Save for later.

[0040] see figure 1 and figure 2 , the carbon quantum dot S of the...

Embodiment 2

[0041] Embodiment 2: The carbon quantum dots doped with sulfur and nitrogen provided by this implementation and its preparation method and application, referring to Example 1, changing the amount of dimercaptosuccinic acid, the specific steps include:

[0042] 1) Dissolve 1 g of citric acid and 0.4 g of dimercaptosuccinic acid in 30 mL of pure water, then add 10 mL of concentrated ammonia water to adjust the pH of the solution to alkaline to fully dissolve the dimercaptosuccinic acid to obtain solution A;

[0043] 2) Transfer solution A to a polytetrafluoroethylene lining, then put it into a stainless steel reactor and react at 150°C for 180 minutes to obtain solution B;

[0044] 3) Transfer solution B to a 1000D dialysis bag, and dialyze for 48 hours to obtain solution C;

[0045] 4) Suction filter solution C with a 0.45 μm organic filter, then freeze at -60°C for 4 hours, and vacuum-dry for 12 hours to obtain D(S,N-CQDs) in the form of yellow-brown powder. Save for later.

Embodiment 3

[0046] Embodiment 3: The carbon quantum dots doped with sulfur and nitrogen provided by this implementation and its preparation method and application, referring to Example 1, changing the amount of concentrated ammonia water, the specific steps include:

[0047] 1) Dissolve 1 g of citric acid and 0.68 g of dimercaptosuccinic acid in 30 mL of pure water, and then add 8 mL of concentrated ammonia water to adjust the pH of the solution to alkaline to fully dissolve the dimercaptosuccinic acid to obtain solution A;

[0048] 2) Transfer solution A to a polytetrafluoroethylene lining, then put it into a stainless steel reactor and react at 150°C for 180 minutes to obtain solution B;

[0049] 3) Transfer solution B to a 1000D dialysis bag, and dialyze for 48 hours to obtain solution C;

[0050] 4) Suction filter solution C with a 0.45 μm organic filter, then freeze at -60°C for 4 hours, and vacuum-dry for 12 hours to obtain D(S,N-CQDs) in the form of yellow-brown powder. Save for l...

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Abstract

The invention discloses a sulfur-nitrogen-doped carbon quantum dot, a preparation method thereof and an application of the sulfur-nitrogen-doped carbon quantum dot in mercury ion detection. The sulfur-nitrogen-doped carbon quantum dot is a surface-sulfhydrylated sulfur-nitrogen-doped carbon quantum dot prepared by taking citric acid as a carbon source, dimercaptosuccinic acid as a sulfur source, stronger ammonia water as a nitrogen source and a pH regulator through a hydrothermal method. The method is used for detecting the concentration of mercury ions in water and is realized by a method for drawing a fluorescence intensity curve through fluorescence spectrometry. Compared with the prior art, the problems of high equipment cost, complicated operation, environmental harmfulness and the like of a traditional mercury ion detection method are solved, the carbon quantum dot is applied to mercury ion detection, and the carbon quantum dot is used for detecting mercury ions by utilizing a fluorescence quenching effect; and the method has the advantages of simple preparation method and detection method, rapidness and convenience in detection, accurate result and the like.

Description

technical field [0001] The invention relates to the technical field of metal ion detection, in particular to a carbon quantum dot doped with sulfur and nitrogen, its preparation method and its application in mercury ion detection. Background technique [0002] Heavy metal ion pollution has become a worldwide problem that seriously endangers human health and the environment. Mercury ions (Hg 2+ ) is one of the most toxic heavy metal ions, which can easily accumulate in the human body through the food chain and cause a series of health problems such as nervous disorders, perforation of the stomach and intestinal septum, and renal failure. Hg 2+ The traditional determination methods include atomic absorption spectrometry (AAS), anodic stripping voltammetry (ASV), inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). Expensive and complex instruments, time-consuming and complex sample pretreatment procedure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B32/15B82Y40/00B82Y20/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65C01B32/15G01N21/643G01N2021/6417G01N2021/6432
Inventor 刘意姚微华映辰刘威刘耿宋杰万雅婷
Owner GUANGDONG PHARMA UNIV
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