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Preparation method for carbon nitride nanofibers and application thereof

A technology of nanofibers and carbon nitride, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problem of low catalytic efficiency of carbon nitride, improve catalytic performance, and increase specific surface area , Increase the effect of catalytic active sites

Active Publication Date: 2019-05-10
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the defect of low catalytic efficiency of carbon nitride existing in the prior art, the object of the present invention is to provide a preparation method of carbon nitride nanofiber and its application in photocatalytic decomposition of water to produce hydrogen. Shaped carbon nitride has a large specific surface area and good photocatalytic performance, and its morphology is relatively uniform.

Method used

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  • Preparation method for carbon nitride nanofibers and application thereof
  • Preparation method for carbon nitride nanofibers and application thereof
  • Preparation method for carbon nitride nanofibers and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1g of melamine, add 48mL of water, heat to 80°C to dissolve to obtain an aqueous solution of melamine; add 0.33g of phytic acid and 16.5mL of water to another container, heat to 80°C to dissolve to obtain an aqueous solution of phytic acid. Mix the melamine aqueous solution and the phytic acid aqueous solution, heat to 85°C and stir for 2 hours, transfer the resulting mixed solution to an ice-water bath to cool, and leave it for 0.5 hours to obtain a melamine / phytic acid hydrogel, and use a freeze dryer to dry the hydrogel Gel to obtain melamine / phytic acid xerogel. The obtained melamine / phytic acid xerogel was calcined in a muffle furnace at 550° C. for 4 hours to prepare carbon nitride nanofibers.

[0031] The scanning electron microscope of the melamine / phytic acid xerogel prepared in this embodiment is as follows: figure 1 As shown, it can be seen that the melamine / phytic acid in the xerogel is in the shape of nanofibers with uniform size; the scanning electr...

Embodiment 2

[0033] Weigh 2g of melamine, add 48mL of water, heat to 80°C to dissolve to obtain an aqueous solution of melamine; add 0.5g of phytic acid and 14.5mL of water to another container, heat to 60°C to dissolve to obtain an aqueous solution of phytic acid. Mix the melamine aqueous solution and the phytic acid aqueous solution, heat to 60°C and stir for 2 hours, transfer the resulting solution to an ice-water bath to cool, and leave it for 0.5 hours to obtain a melamine / phytic acid hydrogel, and use a freeze dryer to dry the melamine / phytic acid gel. acid hydrogel to obtain melamine / phytic acid xerogel. The obtained melamine / phytic acid xerogel was calcined in a muffle furnace at 450° C. for 6 hours to prepare carbon nitride nanofibers.

Embodiment 3

[0035] Weigh 1.5g melamine, add 48.8mL water, heat to 85°C to dissolve to obtain melamine aqueous solution; add 2g phytic acid and 48mL water to another container, heat to 80°C to dissolve to obtain phytic acid aqueous solution. Mix the melamine aqueous solution and the phytic acid aqueous solution, heat to 85°C and stir for 2 hours, transfer the resulting mixed solution to an ice-water bath for cooling, and leave it to stand for 1 hour to obtain a melamine / phytic acid hydrogel, and use a freeze dryer to dry the melamine / phytic acid gel. Phytic acid hydrogel to obtain melamine / phytic acid xerogel. The obtained melamine / phytic acid xerogel was calcined in a muffle furnace at 600° C. for 4 hours to prepare carbon nitride nanofibers.

[0036] Photocatalytic decomposition of water to produce hydrogen:

[0037]The carbon nitride nanofibers prepared in Example 1 were irradiated with visible light to photolyze water to produce hydrogen; Phase carbon nitride refers to the carbon nit...

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Abstract

The invention belongs to the technical field of material preparation and photocatalysis and in particular relates to a preparation method for carbon nitride nanofibers and an application thereof. Thepreparation method comprises the following steps: separately preparing melamine and phytic acid into aqueous solutions, mixing the aqueous solutions in a certain proportion and uniformly mixing the aqueous solutions; putting the mixed solution in an ice-water bath for quick cooling, standing still to prepare a melamine / phytic acid hydrogel, and drying the melamine / phytic acid hydrogel to obtain amelamine / phytic acid dry gel by using a lyophilization method; and calcining the melamine / phytic acid dry gel to prepare the carbon nitride nanofibers. The preparation method for carbon nitride nanofibers employing an ultra-molecular assembling method is quick and simple, easily available in raw material, low in cost and environment-friendly in preparation process, and the prepared material is uniform in shape, large in specific surface area and good in photocatalytic performance. The rate of photocatalytic water splitting to generate hydrogen is 10 times of that of a common phase carbon nitride.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a preparation method and application of carbon nitride nanofibers. Background technique [0002] Carbon nitride is a new type of organic polymer semiconductor photocatalytic material, which can be used in the fields of photocatalytic degradation of organic pollutants, photocatalytic decomposition of water to produce hydrogen, and photocatalytic reduction of carbon dioxide to prepare organic fuels. Very good application value, has received widespread attention. [0003] Carbon nitride has the advantages of good visible light response, good chemical stability, environmental friendliness, and low preparation cost. However, ordinary carbon nitride still has the disadvantages of slow migration rate of photogenerated carriers, high recombination probability of photogenerated electron-hole pairs, and small specific surface area, which limit i...

Claims

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Application Information

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IPC IPC(8): D01F9/08B01J27/24
Inventor 曹鑫张慧王哲孙建华
Owner JIANGSU UNIV OF TECH
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