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G-C3N4/{001}TiO2 composite visible-light-driven photocatalyst and preparation method and application thereof

A g-c3n4, catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of increased cost and energy consumption, unfavorable photocatalytic reaction, unfavorable interfacial charge transfer efficiency and catalytic activity. It can greatly improve the problems such as energy saving, low cost and easy availability of raw materials, and good photocatalytic activity.

Active Publication Date: 2015-10-28
几何智慧城市科技(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the general preparation method is followed, only g-C 3 N 4 and {001}TiO 2 Both are prepared and then combined by post-processing, but the g-C prepared in this way 3 N 4 / {001}TiO 2 The combination of the two phases in the composite photocatalyst must not be as tight as in situ preparation, which is not conducive to the substantial improvement of the interface charge transfer efficiency and catalytic activity.
In addition, {001}TiO 2 F remaining on the surface due to preparation - Ions are generally not conducive to the photocatalytic reaction and need to be removed, but the additional removal of F - The ionic process necessarily increases cost and energy consumption

Method used

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  • G-C3N4/{001}TiO2 composite visible-light-driven photocatalyst and preparation method and application thereof
  • G-C3N4/{001}TiO2 composite visible-light-driven photocatalyst and preparation method and application thereof
  • G-C3N4/{001}TiO2 composite visible-light-driven photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] {001}TiO 2 Preparation of powder: 4.5 mL of 40% HF solution was added to 20 mL of tetrabutyl titanate (TBOT), stirred for 30 min at 25 °C to mix well, and then hydrothermally reacted at 180 °C for 20 h, cooled to room temperature after the reaction, washed the solid precipitate several times with ethanol and deionized water, then dried the obtained solid in an oven at 100°C for 4 h, and finally ground it into a fine powder to obtain {001 }TiO 2 powder.

Embodiment 2

[0029] g-C 3 N 4 Preparation of photocatalysts. Weigh 5 g of urea into a semi-closed crucible, transfer it into a muffle furnace and calcinate at 550 °C for 2 h with a heating rate of 15 °C / min, cool naturally to room temperature and grind to obtain g-C 3 N 4 Powder.

[0030]

Embodiment 3

[0032] g-C 3 N 4 / {001}TiO 2 Preparation of composite photocatalyst: 0.1 g of {001}TiO as described in step (1) 2 The powder was mixed with 5 g of urea, and then the mixture was moved into a semi-closed crucible, placed in a muffle furnace and calcined in an air atmosphere for 2 h at a calcination temperature of 550 °C and a heating rate of 15 °C / min. 3 N 4 In situ growth on {001}TiO 2 surface( figure 1 , figure 2 ), to get the two-phase combined tightly ( image 3 ), and the visible light response ( Figure 4 ) g-C 3 N 4 / {001}TiO 2 composite photocatalyst.

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Abstract

The invention discloses a g-C3N4 / {001}TiO2 composite visible-light-driven photocatalyst and a preparation method and application thereof. According to the method, an HF solution is added into tetrabutyl titanate, stirring and a hydrothermal reaction are conducted, cooling is carried out until the indoor temperature is reached, solid sediment is washed through ethyl alcohol and deionized water, dried and ground into fine powder, and then {001}TiO2 powder is obtained; the {001}TiO2 powder and predecessor of g-C3N4 are mixed, the mixture is moved to a semi-closed crucible, the semi-closed crucible is placed in a muffle furnace so that the mixture can be calcined at the air atmosphere, and the g-C3N4 / {001}TiO2 composite visible-light-driven photocatalyst is obtained. The prepared composite visible-light-driven photocatalyst can be widely applied to the aspects of atmosphere purifying, waste water treating and the like, the preparation technology is extremely simple, the adopted raw materials are low in price and easy to obtain, and the prepared composite visible-light-driven photocatalyst has very large practical application potentiality.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials, in particular to a g-C 3 N 4 / {001}TiO 2 Composite visible light catalyst and its preparation method and application. Background technique [0002] Photocatalytic removal of organic and inorganic pollutants is a promising new technology for environmental remediation. Nano-TiO 2 Due to its cheap and easy to obtain, stable performance, and strong redox ability, it is still one of the best photocatalysts. Many theoretical and experimental studies have shown that, in general, the thermodynamically unstable anatase {001}TiO 2 Compared with conventional {101}TiO 2 higher photocatalytic activity. However, its narrow spectral response range and high carrier recombination probability greatly limit its application. At present, more doping methods are used for {001}TiO 2 Make modifications. But because {001}TiO 2 The degree of crystallinity is high, and it is difficul...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01D53/86B01D53/56
Inventor 胡芸宋旭韦朝海
Owner 几何智慧城市科技(广州)有限公司
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