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A kind of gain endogenous carbon quantum dot and its preparation method and application

A carbon quantum dot, endogenous technology, applied in the field of chemical analysis and detection, can solve the problems of low ion selectivity, expensive equipment, and inability to be widely used, and achieve good biocompatibility, stable optical properties, and short response time Effect

Active Publication Date: 2021-12-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These traditional detection methods have the disadvantages of expensive equipment, complicated and professional operation, complicated pretreatment and low sensitivity to Hg. 2+ Disadvantages such as low ion selectivity, so it cannot be widely used

Method used

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  • A kind of gain endogenous carbon quantum dot and its preparation method and application
  • A kind of gain endogenous carbon quantum dot and its preparation method and application
  • A kind of gain endogenous carbon quantum dot and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take rare Maojian green tea (Hangzhou Tea Industry Research Institute) 0.50g, ascorbic acid 0.05g, place in a 50mL reactor, add 20.00mL ultrapure water to the reactor. The reaction kettle was placed in an oven and reacted at 200° C. for 3 h. The reaction solution was placed in a centrifuge tube and centrifuged at 5000r / min for 15min. The supernatant was taken out and dialyzed in a dialysis membrane (molecular weight cut-off 3500) for 24 hours. Filter the solution after passing through the dialysis membrane with a 0.22 μm filter membrane. The supernatant was taken, and excess water and organic components were removed by rotary steaming (55° C.), and then freeze-dried to obtain endogenous carbon quantum dots with gain.

Embodiment 2

[0030] Take 1.00 mg of carbon dots prepared in Example 1, fully dissolve the carbon dots with ultrapure water and set the volume to 40 mL, take 35.00 μL of dissolved carbon dots in a 1.50 mL quartz cuvette, and use ultrapure water to make up the volume to 1.00mL, and measure the fluorescence intensity under the condition that the excitation wavelength is 360nm. Measurement results such as image 3 Shown in a.

Embodiment 3

[0032] Take Hg(NO 3 ) 2 It was prepared at a concentration of 1 x 10 -3 mol / L solution, add 35.00μL of the prepared carbon dot solution to a 1.50mL quartz cuvette, and then add different concentrations of Hg 2+The ion solution was adjusted to 1.00mL with ultrapure water, and its fluorescence intensity was measured under the condition of an excitation wavelength of 360nm. Measurement results such as Figure 4 shown.

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Abstract

The present invention provides a kind of beneficial endogenous carbon quantum dots. The carbon quantum dots are prepared according to the following method: Weigh precious Maojian green tea and ascorbic acid in a reaction kettle, add ultrapure water into the reaction kettle, wait until the ascorbic acid is fully After dissolving, react at 200°C for 3 hours, then cool to room temperature, centrifuge the reaction solution, take the supernatant and dialyze it in a dialysis membrane with a molecular weight cut-off of 3500 for 24 hours, filter the solution after passing through the dialysis membrane with a 0.22 μm filter membrane, and take The filtrate is decompressed and rotary evaporated, and then freeze-dried to obtain final product; the carbon dots of the present invention have the advantages of non-toxicity, good biocompatibility, stable optical properties, etc., and can treat Hg 2+ Fast, convenient and specific detection of ions.

Description

(1) Technical field [0001] The invention belongs to the technical field of chemical analysis and detection, and in particular relates to a gain-inducing endogenous carbon quantum dot (carbon dot) and a preparation method thereof and a method for specifically detecting Hg 2+ Applications in ion concentration. (2) Background technology [0002] As an emerging nanomaterial, carbon quantum dots have attracted widespread attention due to their unique properties such as low toxicity, good biocompatibility, and excellent optical properties. The excellent properties of carbon quantum dots make it a very broad application prospect. It is known that its application fields mainly include: electrochemistry (making supercapacitors), analytical chemistry (detection of hypochlorous acid and other substances), biological detection (biological imaging), optics (preparation of optical materials), etc., and have achieved good results. . The preparation methods of carbon quantum dots are also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
Inventor 佘远斌徐荧范尧付海燕
Owner ZHEJIANG UNIV OF TECH
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