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Preparation and application of mesoporous silica/polyacrylonitrile core-shell nanofiber membrane loaded with carbon quantum dots

A technology of mesoporous silica and nanofiber membrane, applied in measurement devices, fluorescence/phosphorescence, chemical instruments and methods, etc., can solve the problems of difficult separation and recovery of carbon quantum dot materials, and achieve good pH stability, large Application potential, effect of simple preparation method

Inactive Publication Date: 2018-03-20
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It provides a new way to solve the difficult problem of separation and recovery of existing carbon quantum dot materials in many practical applications

Method used

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  • Preparation and application of mesoporous silica/polyacrylonitrile core-shell nanofiber membrane loaded with carbon quantum dots
  • Preparation and application of mesoporous silica/polyacrylonitrile core-shell nanofiber membrane loaded with carbon quantum dots
  • Preparation and application of mesoporous silica/polyacrylonitrile core-shell nanofiber membrane loaded with carbon quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. The polyacrylonitrile nanofiber membrane with a molecular weight of 50,000 is immersed in a 1:0.2 ethanol:water mixed solution for ultrasound;

[0023] b. During ultrasound, add cetyltrimethylammonium bromide, carbon quantum dot solution, ethyl orthosilicate and ammonia with a concentration of 27wt% in a mass ratio of 1:0.2:0.5:0.5 for sol-gel Reacting to obtain a mesoporous silica / polyacrylonitrile nanofiber membrane mixture with carbon quantum dots immobilized on the outer surface;

[0024] c. Continue the sol-gel reaction and stir the obtained mixture at room temperature for 1 hour;

[0025] d. The mixture in step c is refluxed and washed three times in an ethanol-hydrochloric acid solution with a mass ratio of 1:0.05 to remove the mesoporous porogen to obtain a mesoporous silica / polyacrylonitrile core-shell loaded with carbon quantum dots Nanofiber membrane.

Embodiment 2

[0027] a. The polyacrylonitrile nanofiber membrane with a molecular weight of 100,000 is immersed in a 1:1 ethanol:water mixed solution for ultrasound;

[0028] b. During ultrasound, add cetyltrimethylammonium bromide, carbon quantum dot solution, ethyl orthosilicate and ammonia with a concentration of 27wt% in a mass ratio of 1:1:2:2 for sol-gel Reacting to obtain a mesoporous silica / polyacrylonitrile nanofiber membrane mixture with carbon quantum dots immobilized on the outer surface;

[0029] c. Continue the sol-gel reaction and stir the obtained mixture at room temperature for 6 hours;

[0030] d. The mixture in step c is refluxed and washed 7 times in an ethanol-hydrochloric acid solution with a mass ratio of 1:0.2 to remove the mesoporous porogen to obtain a carbon quantum dot-loaded mesoporous silica / polyacrylonitrile core-shell Nanofiber membrane.

Embodiment 3

[0032] a. The polyacrylonitrile nanofiber membrane with a molecular weight of 150,000 is immersed in a mixture solution of ethanol: water with a mass ratio of 1:0.5 for ultrasound;

[0033] b. During ultrasound, add cetyltrimethylammonium bromide, carbon quantum dot solution, ethyl orthosilicate and ammonia with a concentration of 27wt% in a mass ratio of 1:0.5:1:1 for sol-gel Reacting to obtain a mesoporous silica / polyacrylonitrile nanofiber membrane mixture with carbon quantum dots immobilized on the outer surface;

[0034] c. Continue the sol-gel reaction and stir the obtained mixture at room temperature for 3 hours;

[0035] d. The mixture in step c is refluxed and washed 5 times in an ethanol-hydrochloric acid solution with a mass ratio of 1:0.05-0.2 to remove the mesoporous porogen CTAB to obtain mesoporous silica / polypropylene loaded with carbon quantum dots Nitrile core-shell nanofiber membrane.

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Abstract

The invention relates to preparation and application of mesoporous silica / polyacrylonitrile core-shell nano-fiber films loaded with carbon quantum dots. A method includes preparing mesoporous silica / polyacrylonitrile core-shell nano-fiber film materials loaded with the carbon quantum dots from polyacrylonitrile nano-fiber films, tetraethylortho silicate and the carbon quantum dots by the aid of a sol-gel process. The preparation and the application have the advantages that mesoporous silica / polyacrylonitrile core-shell nano-fiber film materials can be applied to selective fluorescence detection on Fe3+ in water, are good in pH (potential of hydrogen) stability and high in photo-bleaching resistance and are perfect sensitive materials applicable to preparing thin-film type sensing devices.

Description

Technical field [0001] The invention relates to the preparation and application of a mesoporous silica / polyacrylonitrile core-shell nanofiber membrane loaded with carbon quantum dots, in particular to the application of carbon quantum dots in a mesoporous silica / polyacrylonitrile core-shell nanofiber membrane Immobilization method and application in fluorescence sensing detection. Background technique [0002] Carbon quantum dots (CDs) are considered to be the most promising photoluminescence (PL) due to their good biocompatibility, excellent luminescence properties, chemical stability, better solubility, and easy modification. Probe material. Based on the above advantages, scientists have synthesized many kinds of carbon quantum dots through pyrolysis, chemical oxidation, carbonization, hydrothermal method, ultrasonic microwave synthesis, etc., and they are increasingly used in biomolecules, metal ions, Fluorescence sensing of explosives and other substances. On the other han...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C09K11/02G01N21/64
CPCC09K11/025C09K11/65G01N21/643
Inventor 李守柱袁群惠周生海
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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