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Method for preparing nitrogen-doped titanium dioxide/graphite-phase carbon nitride photocatalytic material

A technology of titanium dioxide and nano-titanium dioxide, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of less binding amount and weak binding force, and achieve improved photocatalytic performance and visible light response Ability and effect of photocatalytic activity

Active Publication Date: 2015-12-16
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composite process in the prior art can only combine titanium dioxide and nitrogen source by physical adsorption, and the binding force is very weak and the binding amount is also small.

Method used

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  • Method for preparing nitrogen-doped titanium dioxide/graphite-phase carbon nitride photocatalytic material

Examples

Experimental program
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Effect test

Embodiment 1

[0014] 1. Disperse 5g of nano-titanium dioxide (specifically anatase phase nano-titanium dioxide synthesized by hydrolysis, the same below) in 132.5g of dichloromethane to obtain a white suspension, wherein the mass ratio of titanium dioxide to dichloromethane is 0.0375: 1, then dropwise add 2.5g of toluene diisocyanate to the suspension, wherein the mass ratio of isocyanate to titanium dioxide is 0.05:1, and stir for 6h;

[0015] 2, 25g dicyandiamide is added in the above-mentioned reaction liquid, under N 2 Stir for 12 hours under protection, filter the obtained reaction solution under reduced pressure, wash the filter cake with dichloromethane until the filtrate is colorless, dry the filter cake at 50°C to obtain a titanium dioxide / cyanamide compound, in which the cyanamide compound and nano The mass ratio of titanium dioxide is 5:1;

[0016] 3. Put the titanium dioxide / cyanamide compound in a muffle furnace for calcination at 550° C. for 2 hours, and cool naturally to obt...

Embodiment 2

[0018] 1. Disperse 5g of nano-titanium dioxide in 66.25g of dichloromethane to obtain a white suspension, wherein the mass ratio of titanium dioxide to dichloromethane is 0.075:1, then add 5g of diphenylmethane diisocyanate dropwise to the suspension, wherein The mass ratio of diphenylmethane diisocyanate and titanium dioxide is 2:1, stirring and reacting for 12h;

[0019] 2, 10g cyanamide is joined in the above-mentioned reaction liquid, under N 2 Stir for 2 hours under protection, filter the obtained reaction solution under reduced pressure, wash the filter cake with dichloromethane until the filtrate is colorless, dry the filter cake at 60°C to obtain a titanium dioxide / cyanamide compound, in which the cyanamide compound and nano The mass ratio of titanium dioxide is 2:1;

[0020] 3. Put the titanium dioxide / cyanamide compound in a muffle furnace for calcination at 500° C. for 2 hours, and cool naturally to obtain the final nitrogen-doped graphite phase carbon nitride / tita...

Embodiment 3

[0022] 1. Disperse 5g of nano titanium dioxide in 26.5g of dichloromethane to obtain a white suspension, wherein the mass ratio of titanium dioxide to dichloromethane is 0.15:1, then add 5.125g of TDI dropwise to the suspension, wherein the mass ratio of TDI to titanium dioxide is The ratio is 1.025:1, stirring reaction 24h;

[0023] 2, 17.5g melamine is added in the above-mentioned reaction liquid, under N 2 Stir for 7 hours under protection, filter the obtained reaction solution under reduced pressure, wash the filter cake with dichloromethane until the filtrate is colorless, dry the filter cake at 70°C to obtain a titanium dioxide / cyanamide compound, in which the cyanamide compound and nano The mass ratio of titanium dioxide is 3.5:1;

[0024] 3. Put the titanium dioxide / cyanamide compound in a muffle furnace for calcination at 600° C. for 2 hours, and cool naturally to obtain the final nitrogen-doped graphite phase carbon nitride / titanium dioxide material.

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Abstract

The invention belongs to the technical field of environmental materials and particularly relates to a photocatalytic material and a preparation method therefor. The preparation method comprises the steps of dispersing anatase-phase nano titanium dioxide into dichloromethane so as to obtain a white suspension, then, dropwise adding isocyanate into the suspension, and carrying out stirring reaction; and adding a cyanamide compound, carrying out stirring reaction, carrying out suction filtration at reduced pressure so as to obtain a titanium dioxide / cyanamide compound, and carrying out calcining and natural cooling, thereby obtaining a nitrogen-doped titanium dioxide / graphite-phase carbon nitride composite material. According to the photocatalytic material and the preparation method therefor, isocyanate serves as a bridging body to combine the cyanamide compound and nano titanium dioxide in the form of chemical bond, carbon nitride is subjected to in-situ growth on surfaces of titanium dioxide particles under high-temperature conditions, and heterojunctions with electron conduction capacity are formed between carbon nitride and titanium dioxide, so that the photocatalytic property of the composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of environmental materials, and in particular relates to a photocatalytic material and a preparation method thereof. Background technique [0002] Titanium dioxide has the advantages of non-toxic, harmless, acid and alkali corrosion resistance and excellent photocatalytic activity. However, the titanium dioxide semiconductor has a band gap between 3.0eV and 3.2eV, and it mainly absorbs 3% to 5% of ultraviolet light in sunlight, but has a low utilization rate for visible light. In order to improve the visible light responsiveness of titanium dioxide, it is often achieved by means of non-metal doping, metal (or metal oxide) compounding or other carrier compounding. [0003] Graphite carbon nitride (g-C 3 N 4 ) is a new type of visible light-responsive non-metallic photocatalytic material, which has been introduced into the field of photocatalysis due to its unique semiconductor band structure and excellent ...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 刘文杰袁华左士祥姚超魏科年杜涛李霞章
Owner CHANGZHOU UNIV
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