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g-C3N4-based TiO2 crystal grain accumulation three-dimensional through hole composite structure and preparation method thereof

A composite structure, g-c3n4 technology, used in chemical instruments and methods, catalyst activation/preparation, water/sludge/sewage treatment, etc., can solve the problems of complex preparation methods, difficult to control morphology, and small specific surface area. , to achieve the effect of short light response time, developed through-hole structure and high photocatalytic activity

Active Publication Date: 2021-07-16
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a g-C based 3 N 4 TiO 2 Grain-stacked three-dimensional through-hole composite structure photocatalyst material and its preparation method, the purpose of which is to solve the problem of small specific surface area, few active sites and low catalytic activity in existing composite materials, and the preparation method in the prior art is complicated in process and high in cost. , shape is difficult to control and other issues

Method used

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  • g-C3N4-based TiO2 crystal grain accumulation three-dimensional through hole composite structure and preparation method thereof
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  • g-C3N4-based TiO2 crystal grain accumulation three-dimensional through hole composite structure and preparation method thereof

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preparation example Construction

[0031] A g-C based 3 N 4 TiO 2 A method for preparing a grain-stacked through-hole composite structure, comprising the following steps:

[0032] (1) Weigh the mass ratio of oxalamide: urea to be 0.3-0.8:10, put it into a crucible with a lid after grinding, and the calcination process will be accompanied by the generation of ammonia gas, which reduces volatilization and increases the yield. ℃ / min heating rate, heating up to 450-650℃, keeping warm for 1-3h; after cooling to room temperature, grinding for 30-60min to obtain multi-dimensional through-hole structure g-C 3 N 4 ;

[0033] (2) Configure the concentration of 0.017-0.043mol / L titanium sulfate aqueous solution, add 0.3g multi-dimensional through-hole structure g-C to 75ml titanium sulfate aqueous solution 3 N 4 , the stirring speed is 500-1000rpm, first stir for 30min and then sonicate for 0.5-1h to obtain a uniformly dispersed suspension;

[0034] (3) Transfer the suspension obtained in step (2) into a high-press...

Embodiment 1

[0037] (1) Weigh the mass ratio of oxalamide and urea to be 0.5:10, put it into a crucible with a lid after grinding, raise the temperature to 550°C at a heating rate of 5°C / min, and keep it warm for 2 hours; cool to After room temperature, grinding to obtain a three-dimensional through-hole structure g-C 3 N 4 ;

[0038] (2) Prepare a titanium sulfate aqueous solution with a concentration of 0.03mol / L, add 0.3g of multidimensional through-hole structure g-C to 75ml of titanium sulfate aqueous solution 3 N 4 , first stir for 30 minutes and then sonicate for 0.5-1h to obtain a uniformly dispersed suspension;

[0039] (3) Transfer the suspension obtained in step (2) into an autoclave, react at 180°C for 2 hours, and after it is naturally cooled to room temperature, wash the product three times with distilled water and ethanol, and dry at 60°C to obtain g-C 3 N 4 / TiO 2 Three-dimensional through-hole composite structure photocatalytic material.

Embodiment 2

[0041] (1) Weigh the mass ratio of oxalamide and urea to be 0.3:10, put it into a crucible with a lid after grinding, raise the temperature to 650°C at a heating rate of 5°C / min, and keep it warm for 3 hours; cool to After room temperature, grind to get irregular sheet-like structure g-C 3 N 4 ;

[0042] (2) Prepare a titanium sulfate aqueous solution with a concentration of 0.03mol / L, add 0.3g of multidimensional through-hole structure g-C to 75ml of titanium sulfate aqueous solution 3 N 4 , first stir for 30 minutes and then sonicate for 0.5-1h to obtain a uniformly dispersed suspension;

[0043] (3) Transfer the suspension obtained in step (2) into an autoclave, react at 180°C for 2 hours, and after it is naturally cooled to room temperature, wash the product three times with distilled water and ethanol, and dry at 60°C to obtain g-C 3 N 4 / TiO 2 Through hole composite structure photocatalytic material.

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Abstract

The invention relates to a g-C3N4-based TiO2 crystal grain accumulation through hole composite structure, a substrate g-C3N4 powder is light and fluffy and has a through hole structure uniformly distributed in a multi-dimensional direction, the hole wall thickness of the through hole structure is 20-40nm, and the pore diameter range of the through hole structure is 100-200nm; TiO2 nano crystal grains with the size of 10-20 nm are uniformly distributed on multi-dimensional pore walls of the through hole structure to form a g-C3N4 / TiO2 composite layer structure, the thickness of the g-C3N4 / TiO2 composite layer structure is 30-50 nm, and the multi-dimensional through-pore structure g-C3N4 / TiO2 formed by accumulating the TiO2 nano crystal grains has micropores with the size of 0.5-1.5 nm, mesopores with the size of 2-4 nm, mesopores with the size of 25-45 nm and macropores with the size of 90-200 nm. The problems that an existing composite material is small in specific surface area, few in active sites and low in catalytic activity, and a preparation method in the prior art is complex in process, high in cost, difficult in morphology control and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor composite photocatalytic materials, in particular to a g-C 3 N 4 TiO 2 Grain-stacked three-dimensional through-hole composite structure and its preparation method. Background technique [0002] The continuous deterioration of the environment and the urgent demand of human beings for renewable and clean energy have made photocatalytic technology one of the hotspots of contemporary scientific research. Photocatalytic technology is considered to be one of the most potential green means to solve the problems of energy shortage and environmental pollution. Photocatalytic technology can remove and purify environmental pollutants at low concentrations by using only the light energy of sunlight without consuming earth energy or using harmful chemicals, and can also be used as antibacterial and antifungal agents , so it is an environmental purification technology with broad application prospects....

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J37/08C02F1/30C02F101/34C02F101/38
CPCB01J27/24B01J37/082B01J37/088C02F1/30C02F2101/345C02F2101/38B01J35/60B01J35/643B01J35/615B01J35/651B01J35/633B01J35/647B01J35/39
Inventor 李明春郭银彤任龙
Owner SHENYANG POLYTECHNIC UNIV