Heterogenous photocatalyst with multichannel carrier separation function and preparation method and application of heterogenous photocatalyst with multichannel carrier separation function

A photocatalyst and carrier technology, applied in the field of photocatalytic materials, can solve the problems of low activity, difficult to interweave to form a phase interface, complex preparation process, etc., achieve simple preparation method, excellent photocatalytic performance, and promote photocatalytic reaction. Effect

Inactive Publication Date: 2016-07-13
SUN YAT SEN UNIV
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  • Abstract
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Problems solved by technology

However, these two types of materials with little correlation are compounded by a multi-step method. First, the preparation process is complicated; is the most reported ZnO / TiO 2 The photocatalytic activity is still lower than that of commercial P25 particles composed of anatase and rutile phases (4 / 1, W / W), and the performance still needs to be further improved to meet its application in the field of photocatalysis

Method used

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  • Heterogenous photocatalyst with multichannel carrier separation function and preparation method and application of heterogenous photocatalyst with multichannel carrier separation function
  • Heterogenous photocatalyst with multichannel carrier separation function and preparation method and application of heterogenous photocatalyst with multichannel carrier separation function
  • Heterogenous photocatalyst with multichannel carrier separation function and preparation method and application of heterogenous photocatalyst with multichannel carrier separation function

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Embodiment 1

[0019] A preparation method of a ZnO / P25 heterogeneous photocatalyst with multi-channel carrier separation function: (1) at room temperature, zinc acetate is dissolved in pure water to configure an aqueous solution of zinc acetate with a concentration of 0.5% by weight . (2) Pour the P25 powder into the solution and fully disperse it. (3) The solution in step (2) was dried at a constant temperature of 120° C. for 10 h, and then calcined at 500° C. for 6 h to obtain the final product. by TiO 2 The strongest characteristic peak intensity of the two phases is used for semi-quantitative analysis of the content of the two phases. The results show that the content ratio of anatase to rutile is about 3.83 / 1. figure 1 It is the HRTEM figure of embodiment 1; figure 2 It is a schematic diagram of the multi-channel separation carrier mechanism in the ZnO / P25 heterojunction.

Embodiment 2

[0023] A preparation method of ZnO / P25 heterogeneous photocatalyst with multi-channel carrier separation function: (1) at room temperature, zinc nitrate hydrate is dissolved in pure water, and it is configured as nitric acid with a concentration of 0.1% by weight Zinc solution. (2) Pour the P25 powder into the solution and fully disperse it. (3) The solution in step (2) was dried at a constant temperature of 120° C. for 10 h, and then calcined at 600° C. for 6 h to obtain the final product. The ratio of anatase to rutile content is about 3.90 / 1.

Embodiment 3

[0025] Get 0.2g embodiment 1-2 and the catalyst described in comparative example respectively, uniform coating film is in 7.0cm 2 On the watch glass, and placed at the bottom of the reactor, with mixed gas (O 2 :N 2 =1:3) Purging for 1h to remove CO in the reactor 2 . Toluene visible photocatalytic reaction experimental conditions: toluene gas is bubbled, mixed gas (O 2 :N 2 =1:3) into the reaction kettle, control the initial concentration of toluene in the reaction kettle to be ~200ppm, and the relative humidity to be ~16%. balance. A 200w xenon lamp equipped with a UV reflector is used as a simulated ultraviolet light source (λ=300-400nm, and the light intensity is 200mw cm -2 ), reacted for 120min, took a sample every 10min, and detected the concentration of toluene and GC2060,FID) by gas chromatography (GC7900,FID) to detect CO 2 Yield. And use the following formula to calculate the conversion rate: where n Tol,0 is the amount of toluene initial substance (mol),...

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Abstract

The invention discloses a heterogenous photocatalyst with a multichannel carrier separation function and a preparation method and application of the heterogenous photocatalyst with the multichannel carrier separation function.The heterogenous photocatalyst 100% in total, comprises, by weight, 0.1-10% of ZnO and the balance mixed-phase titanium dioxide P25.The ZnO serving as a compound-phase component is dispersed in the catalyst uniformly, two phases are sufficiently mixed together, electron-hole produced by ultraviolet excitation of the P25 can be separated effectively, and the ZnO/P25 heterogenous photocatalyst demonstrates more excellent photocatalytic performance than the P25.When the heterogenous photocatalyst is applied to ultraviolet light catalytic reaction of low-concentration methylbenzene organic gas, methylbenzene in a system can be completely oxidized into carbon dioxide and water at room temperature.The preparation method is simple, mild in preparation conditions, convenient to operate and convenient for enlarged industrialized production.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a heterogeneous photocatalyst with multi-channel carrier separation function and its preparation method and application. Background technique [0002] In terms of eliminating environmental pollutants, the photocatalytic degradation reaction has low energy consumption and high purification efficiency, and is one of the most promising technologies. However, there are still some technical problems to be solved urgently in photocatalytic technology, such as traditional photocatalysts such as TiO 2 The rapid recombination of photogenerated electron-hole pairs leads to low quantum yield of photocatalysts. Therefore, the development and utilization of heterojunction photocatalysts for the purpose of promoting the separation of photogenerated electron-hole pairs has always been a key research object in the field of photocatalysis. [0003] For conventional TiO 2 Preci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01D53/72B01D53/86
CPCB01D53/864B01D53/8668B01J23/06B01J35/004B01D2256/22
Inventor 纪红兵孔洁静芮泽宝赖晓冬
Owner SUN YAT SEN UNIV
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