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Preparation method of carbon nanodots and application of the carbon nanodots as acid-base indicator

The technology of acid-base indicator and carbon nano-dots is applied in the field of preparation of acid-base indicator, which can solve the problems of rare application and achieve the effect of easy observation.

Active Publication Date: 2020-06-05
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, many studies are focused on the fluorescence properties of carbon nanodots, and the application of its visible absorption spectrum is rare.

Method used

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  • Preparation method of carbon nanodots and application of the carbon nanodots as acid-base indicator
  • Preparation method of carbon nanodots and application of the carbon nanodots as acid-base indicator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing carbon nano-dots, comprising the steps of:

[0021] 1) Dissolve 0.2g of o-phenylenediamine and 0.13g of urea in 10mL of deionized water, and then mix well with 20mL of 4.2mol / L sulfuric acid solution. The resulting mixed solution was added to a polytetrafluoroethylene reaction kettle, and the reaction kettle was put into an oven for hydrothermal reaction at 210° C. for 10 h, and cooled to room temperature to obtain a crude product.

[0022] 2) The obtained crude product was filtered with a 0.22 μm filter membrane, washed three times with deionized water, and the cleaned product was placed in a dialysis bag (MW=5000) and dialyzed until the exudate was colorless and neutral , this process takes about 24 hours.

[0023] 3) The dialyzed product was rotary evaporated at 60° C. to remove most of the water, and then vacuum-dried at 60° C. for 24 hours to obtain a black powder which was the target product carbon nanodots.

[0024] figure 1 Transmission...

Embodiment 2

[0027] Application of carbon nanodots as acid-base indicators

[0028] The carbon nanodots prepared in Example 1 were used as an acid-base indicator, and the discoloration range was found to be 3.3-4.4, and the discoloration results are shown in Table 1.

[0029] Table 1 Colors of carbon nanodots under different pH conditions

[0030] pH<3.3

[0031] It can be seen from Table 1 that the carbon nanodots prepared by the present invention have a discoloration range of 3.3-4.4, pH4.4 is pink, and the color change is obvious and easy to observe. Therefore, the carbon nano-dots prepared by the present invention are expected to become a new type of acid-base indicator as an acid-base indicator.

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Abstract

The invention discloses a preparation method of carbon nanodots and application of the carbon nanodots as an acid-base indicator. The preparation method comprises the following steps: dissolving o-phenylenediamine and urea in water, adding sulfuric acid, uniformly mixing, adding the obtained mixed solution into a polytetrafluoroethylene reaction kettle, putting the reaction kettle into an oven, carrying out a hydrothermal reaction, and cooling to room temperature to obtain a crude product; filtering the obtained crude product with a filter membrane, cleaning with deionized water, putting the product into a dialysis bag, and dialyzing until the percolate is colorless and neutral; and carrying out rotary evaporation and vacuum drying on the dialyzed product to obtain the carbon nanodot powder. The prepared carbon nanodots are used as an acid-base indicator, the color change range is 3.3-4.4, show blue when ph is less than 3.3, show purple when the pH is higher than 3.3 and lower than 4.4, and show pink when pH is greater than 4.4, the color change is obvious, observation is easy, and the carbon nanodots are expected to become a novel acid-base indicator.

Description

technical field [0001] The invention relates to an acid-base indicator, in particular to a preparation method of an acid-base indicator based on carbon nano-dots. Background technique [0002] Carbon nanodots (Carbon Dots, referred to as CDs) as a new type of carbon material has been widely concerned. Due to their good fluorescence properties, photostability, and adjustable structure, carbon nanodots have been widely used in cell imaging analysis, sensing detection, drug delivery, and catalysis. However, at present, many studies focus on the fluorescence properties of carbon nanodots, and the application of its visible absorption spectrum is rare. Contents of the invention [0003] In the invention, o-phenylenediamine and urea are used as precursors, and carbon nano-dots are prepared by a hydrothermal method under conditions of certain acidity, solvent and temperature. It is clearly colored as an acid-base indicator. [0004] The technical scheme adopted in the present ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65G01N21/80
CPCC01B32/15C09K11/65G01N21/80
Inventor 马天翼毛全兴朱站
Owner LIAONING UNIVERSITY