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g-C3N4/TiO2 composite photochemical catalyst and preparation method thereof

A photocatalyst, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of restricting the transport of photogenerated electrons and holes, the accumulation of photogenerated electrons and holes cannot be effectively utilized, the influence of photocatalyst activity and stability, etc. Conducive to large-scale preparation, improved quantum efficiency, and low-cost effects

Active Publication Date: 2016-06-08
LIAONING UNIVERSITY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional composite semiconductor photocatalysts often produce encapsulation during the preparation process, that is, two photocatalysts envelop each other. Although this structure can promote the separation of photogenerated electrons and holes, it seriously restricts the macroscopic distance between photogenerated electrons and holes. The transport on the surface, the accumulation of photogenerated electrons and holes cannot be effectively utilized, thus affecting the activity and stability of the photocatalyst

Method used

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  • g-C3N4/TiO2 composite photochemical catalyst and preparation method thereof
  • g-C3N4/TiO2 composite photochemical catalyst and preparation method thereof
  • g-C3N4/TiO2 composite photochemical catalyst and preparation method thereof

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Embodiment 1

[0033] Embodiment 1 A kind of g-C 3 N 4 / TiO 2 Composite photocatalyst (g-C 3 N4 and TiO 2 The mass ratio is 2:1)

[0034] The preparation method is as follows:

[0035] 1) Mix 3g of tetra-n-butyl titanate, 0.2g of triethanolamine and 20ml of absolute ethanol, and record it as solution B; ultrasonically disperse 0.5g of PS balls in 60ml of absolute ethanol, ultrasonically disperse for 1 hour, and then add 0.5ml of Ammonia, denoted as solution A; then the solution B that was stirred until transparent was added dropwise to solution A, and stirred for 2 hours to obtain TiO with a core-shell structure. 2 PS ball;

[0036] 2) Obtain TiO from 1) 2 PS spheres were dispersed in 60ml of methanol solution, which was recorded as solution C; 1.4gg-C 3 N 4 Ultrasonic dispersion in 200ml of methanol solution, recorded as solution D; solution C that has been ultrasonically dispersed for 1 hour was added drop by drop to solution D that had been ultrasonically dispersed for 1 hour, an...

Embodiment 2

[0041] Embodiment 2 A kind of g-C 3 N 4 / TiO 2 Composite photocatalyst (g-C 3 N 4 with TiO 2 The mass ratio is 1.5:1)

[0042] The preparation method is as follows:

[0043] 1) Mix 3g of tetra-n-butyl titanate, 0.2g of triethanolamine and 20ml of absolute ethanol, and record it as solution B; ultrasonically disperse 0.5g of PS balls in 60ml of absolute ethanol, ultrasonically disperse for 1 hour, and then add 0.5ml of Ammonia, denoted as solution A; then the solution B that was stirred until transparent was added dropwise to solution A, and stirred for 2 hours to obtain TiO with a core-shell structure. 2 PS ball;

[0044] 2) Obtain TiO from 1) 2 PS spheres were dispersed in 60ml of methanol solution, which was recorded as solution C; 1.05gg-C 3 N 4 Ultrasonic dispersion in 200ml of methanol solution, recorded as solution D; solution C that has been ultrasonically dispersed for 1 hour was added drop by drop to solution D that had been ultrasonically dispersed for 1 ho...

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Abstract

The invention discloses a g-C3N4 / TiO2 composite photochemical catalyst, which has an arced sheet structure, wherein the sheet structure is obtained by crushing through the hollow microspheric g-C3N4 / TiO2 composite photochemical catalyst; the hollow microspheric g-C3N4 / TiO2 composite photochemical catalyst is divided into an inside photochemical catalyst and an outside photochemical catalyst; the inside photochemical catalyst is TiO2; the outside photochemical catalyst is g-C3N4. By using the composite photochemical catalyst, the utilization ratio of photo-induced electron-holes is improved; the quantum efficiency of the photochemical catalyst is improved; the service life of the photochemical catalyst is prolonged; the preparation method of the g-C3N4 / TiO2 composite photochemical catalyst is simple, convenient and low-cost, is mild in condition, and is beneficial to large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a g-C 3 N 4 / TiO 2 Composite photocatalyst and preparation method thereof. Background technique [0002] Photocatalytic technology is an environmentally friendly technology. Photocatalytic materials can use sunlight to decompose water to produce hydrogen to obtain renewable energy. In addition, it can also be applied to environmental purification to solve energy and environmental problems faced by human development. As a semiconductor photocatalyst, titanium dioxide has the advantages of non-toxicity, low cost, and no secondary pollution. It has broad application prospects in the fields of environmental pollution degradation, photo-splitting water to produce hydrogen, and the like. [0003] However, titanium dioxide has a large band gap. The anatase phase of titanium dioxide is 3.2eV, and its catalytic activity can only be stimulated by ultraviolet light with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02B01J37/02B01J37/08B01D53/86B01D53/72B01J35/00
CPCB01D53/8668B01J27/24B01J37/0244B01J37/082B01D2255/20707B01D2257/70B01D2255/802B01J35/00B01J35/30B01J35/39
Inventor 范晓星韩晓鹏吕佳男孔令茹王丽王绩伟宋朋
Owner LIAONING UNIVERSITY
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