S,Se-CQDs and method for efficiently detecting Cr(VI) pollutants by using S,Se-CQDs

A pollutant and high-efficiency technology, applied in chemical instruments and methods, measuring devices, fluorescence/phosphorescence, etc., can solve problems such as affecting human health, polluting the environment, poor selectivity, etc., achieving obvious differences in selectivity, strong anti-interference ability, low cost effect

Active Publication Date: 2020-01-24
GUANGDONG PHARMA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the S,Se-CQDs obtained in this invention mainly use the Se element in it to participate in the "cutting" of the disulfide bond in the hair, so it is used as a hair styling agent, and it is not used for Cr(VI) pollutants detection
[0005] In view of the problems of Cr(VI) detection methods such as polluting the environment, affecting human health, high detection limit, complicated steps or poor selectivity, it is necessary to find a method for S,Se-CQDs and its efficient detection of Cr(VI) pollutants , making the detection method simple, low cost, and highly selective for the detection of Cr(VI)

Method used

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  • S,Se-CQDs and method for efficiently detecting Cr(VI) pollutants by using S,Se-CQDs
  • S,Se-CQDs and method for efficiently detecting Cr(VI) pollutants by using S,Se-CQDs
  • S,Se-CQDs and method for efficiently detecting Cr(VI) pollutants by using S,Se-CQDs

Examples

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Embodiment 1

[0036] Dissolve citric acid (5.0g), mercaptoethylamine (0.8g) and sodium selenite (0.06g) in 40mL of pure water in sequence. After fully dissolved, add an appropriate amount of pure water to a total volume of 50mL, and then transfer the solution Put it into a 50mL polytetrafluoroethylene lining, put the lining into a stainless steel reactor and place it in an oven at 150°C for 150 minutes of hydrothermal reaction, then take out the solution after the temperature of the oven drops to room temperature, and then put it under the condition of 8000r / min Centrifuge for 20 minutes, separate the supernatant, and then dialyze with a 200Da dialysis bag for 2 days, change the water every 8 hours, and finally freeze-dry to obtain the target product: sulfur-selenium doped carbon quantum dots (S,Se-CQDs).

Embodiment 2

[0038] Dissolve citric acid (6.0g), mercaptoethylamine (0.8g) and sodium selenite (0.06g) in 40mL of pure water in turn. After fully dissolved, add an appropriate amount of pure water to a total volume of 50mL, and then transfer the solution Put it into a 50mL polytetrafluoroethylene lining, put the lining into a stainless steel reactor and place it in an oven at 150°C for 150 minutes of hydrothermal reaction, then take out the solution after the temperature of the oven drops to room temperature, and then put it under the condition of 8000r / min Centrifuge for 20 minutes, separate the supernatant, and then dialyze with a 200Da dialysis bag for 2 days, change the water every 8 hours, and finally freeze-dry to obtain the target product: sulfur-selenium doped carbon quantum dots (S,Se-CQDs).

Embodiment 3

[0040]Dissolve citric acid (8.0g), mercaptoethylamine (0.8g) and sodium selenite (0.06g) in 40mL of pure water in sequence, add appropriate amount of pure water to a total volume of 50mL after the dissolution is sufficient, and then transfer the solution Put it into a 50mL polytetrafluoroethylene lining, put the lining into a stainless steel reactor and place it in an oven at 150°C for 150 minutes of hydrothermal reaction, then take out the solution after the temperature of the oven drops to room temperature, and then put it under the condition of 8000r / min Centrifuge for 20 minutes, separate the supernatant, and then dialyze with a 200Da dialysis bag for 2 days, change the water every 8 hours, and finally freeze-dry to obtain the target product: sulfur-selenium doped carbon quantum dots (S,Se-CQDs).

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Abstract

The invention provides S,Se-CQDs and a method for efficiently detecting Cr(VI) pollutants by using the S,Se-CQDs, and belongs to the field of nanometer new materials and environmental analysis crossing. The preparation method comprises: dissolving citric acid, mercaptoethylamine and sodium selenite into pure water, naturally cooling to a room temperature after carrying out a hydrothermal reaction,taking out the solution, carrying out centrifugation, separating the supernatant, dialyzing the centrifugation, and carrying out freeze-drying to prepare the doped carbon quantum dots S,Se-CQDs withhigh fluorescence intensity. According to the invention, the S,Se-CQDs preparation process is simple, the cost is low, and the prepared S,Se-CQDs can efficiently detect Cr(VI); when a proper amount ofvitamin C (Vc) is added, the fluorescence of the system comprising Cr(VI) and S,Se-CQDs can be recovered by 80%; and the method for detecting Cr(VI) through S,Se-CQDs is simple, low in cost, obviousin selection difference and high in anti-interference capacity.

Description

technical field [0001] The invention belongs to the intersection field of new nanometer materials and environmental analysis, and in particular relates to S,Se-CQDs and a method for efficiently detecting Cr(VI) pollutants. Background technique [0002] Cr(VI) is one of the common valence states of chromium. Compared with chromium metal, trivalent or tetravalent chromium, it is the most toxic and more easily absorbed by the human body. It can invade the human body through digestion, respiratory tract, skin and mucous membranes. So far, for the determination of Cr(VI) in water, the classic method has the national standard - diphenylcarbazide spectrophotometry (GB / T 746-1987), but this method has certain limitations, such as using Toxic test reagents such as hydrazine substances, thereby causing environmental pollution or affecting human health. Other testing methods also have the defects of high detection limit, complicated steps or poor selectivity, or based on biocompatibil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88G01N21/64
CPCC09K11/881G01N21/643G01N2021/6432
Inventor 刘意骆玉凤陈平潘妙钏
Owner GUANGDONG PHARMA UNIV
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