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Sulfydryl-modified cyan fluorescent carbon quantum dot and application thereof in rapid detection of arsenic ions in water

A technology of thiol modification and carbon quantum dots, applied in fluorescence/phosphorescence, nano-carbon, nano-optics, etc., can solve the problems of complex sample pretreatment, expensive equipment, low work efficiency, etc., and achieve good water solubility and detection limit low cost effect

Active Publication Date: 2021-06-22
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, methods for detecting As(III) include atomic absorption spectrometry (AAS), inductively coupled plasma mass spectrometry (ICP-MS), atomic fluorescence spectroscopy (AFS), etc. These detection methods require large-scale equipment, and the equipment is expensive. Special maintenance is required, the detection cost is high, the sample pretreatment is complicated, and the work efficiency is low

Method used

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  • Sulfydryl-modified cyan fluorescent carbon quantum dot and application thereof in rapid detection of arsenic ions in water
  • Sulfydryl-modified cyan fluorescent carbon quantum dot and application thereof in rapid detection of arsenic ions in water
  • Sulfydryl-modified cyan fluorescent carbon quantum dot and application thereof in rapid detection of arsenic ions in water

Examples

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Effect test

Embodiment 1

[0030] Take 3g tartaric acid and add it to 30mL deionized water, sonicate for 30 minutes; add 7.5g cysteine ​​to 30mL deionized water, sonicate for 30 minutes; mix the two solutions evenly, and transfer them to the polytetrafluoroethylene in a 100mL hydrothermal kettle. In an ethylene liner, sealed, heated to 200°C, reacted for 10 hours, cooled to room temperature, transferred the product to a dialysis bag with a molecular weight cut-off of 2000, and dialyzed in deionized water for 24 hours; collected samples in the dialysis bag and frozen Dried to obtain a brown solid powder, namely thiol-modified cyan fluorescent carbon quantum dots. Depend on figure 1 It can be seen that the obtained solid powder has uniform size and good dispersibility. Depend on figure 2 It can be seen that the size distribution of the obtained solid powder is mainly concentrated between 4 and 7 nm. image 3 Middle 3400~3300cm -1 The moderately strong absorption peak corresponds to the N-H stretching...

Embodiment 2

[0032]Take 1.5g of tartaric acid and add it to 30mL deionized water, and sonicate for 30 minutes; add 7.5g of cysteine ​​to 30mL of deionized water, and sonicate for 30 minutes; In a vinyl fluoride liner, sealed, heated to 200°C, reacted for 9 hours, cooled to room temperature, transferred the product to a dialysis bag with a molecular weight cut-off of 2000, and dialyzed in deionized water for 24 hours; collected samples in the dialysis bag, Freeze-dry to obtain a brown solid powder, that is, thiol-modified cyan fluorescent carbon quantum dots.

Embodiment 3

[0034] Take 3g tartaric acid and add it to 30mL deionized water, sonicate for 30 minutes; add 6.0g cysteine ​​to 30mL deionized water, sonicate for 30 minutes; after mixing the two solutions evenly, transfer them to the polytetrafluoroethylene in a 100mL hydrothermal kettle. In an ethylene liner, sealed, heated to 200°C, reacted for 12 hours, cooled to room temperature, transferred the product to a dialysis bag with a molecular weight cut-off of 2000, and dialyzed in deionized water for 24 hours; collected samples in the dialysis bag and frozen Dried to obtain a brown solid powder, namely thiol-modified cyan fluorescent carbon quantum dots.

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Abstract

The invention discloses a sulfydryl-modified cyan fluorescent carbon quantum dot and application thereof in rapid detection of arsenic ions, and the quantum dot is brown solid powder which is synthesized by taking tartaric acid and cysteine as raw materials through hydrothermal reaction and has the size of 4-10nm. The maximum excitation wavelength of the quantum dot is 320 nm, the maximum emission wavelength is 405 nm, and the quantum dot has good water solubility, light stability and biological compatibility. Under the condition of a PBS buffer solution system, the quantum dot can realize rapid detection of metal arsenic ions by utilizing fluorescence intensity change, and has the advantages of simplicity in operation, high sensitivity, good specificity, low detection limit, high stability, rapid response, good repeatability and the like, and the detection limit of the arsenic ions is 0.03 ppb. The preparation method of the quantum dot is simple, high in operation repeatability and low in cost, can be put into industrial production, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and chemical analysis and detection, and in particular relates to a thiol-modified cyan fluorescent carbon quantum dot and its application for rapidly detecting arsenic ions in water. Background technique [0002] Arsenic occurs in nature as As 3- 、As 0 、As 3+ and As 5+ It exists in four forms and is one of the common pollutants. Among them, As(III) is the most harmful. The toxicity of arsenic can induce the proliferation of tumor cells, and prolonged exposure to inorganic arsenic will cause cancer in the corresponding parts of the human body. Arsenic can also penetrate the placental mucosa and enter the metabolic system of the unborn baby, causing deformities; in addition, arsenic can also cause ischemic heart disease and cardiovascular disease. Researchers have studied some chemical properties of As(III). Studies have found that As(III) is easy to coordinate with the sulf...

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
CPCC09K11/65C01B32/15B82Y20/00B82Y40/00G01N21/643G01N2021/6417C01P2002/01C01P2002/85C01P2004/64C01P2002/72
Inventor 雷忠利刘江涛爱莎·坎瓦尔杨红
Owner SHAANXI NORMAL UNIV
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