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Novel method for preparing compound high-activity photocatalyst

A photocatalyst and catalyst technology, which is applied in the direction of chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as difficult preparation, poor repeatability of photocatalysts, complicated photocatalyst operations, etc., to reduce Recombination probability, stable activity, and the effect of increasing the photoresponse wavelength

Inactive Publication Date: 2010-05-12
淮北煤炭师范学院
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the results reported so far, the photocatalyst prepared by the above method is more complicated to operate, and the repeatability of the prepared photocatalyst is poor.
At the same time, it is difficult to prepare multi-junction composite photocatalysts using common chemical methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment one: take by weighing the TiO of 5.0g 2 Add different amounts of p-CuBi to the powder 2 o 4 , the ratio of the sample to the agate ball is 1:10 and put it into the agate ball mill jar, with 5.0mL of H 2 O was used as a dispersant, ball milled at a rate of 550 rpm, taken out after a certain period of time, dried at 110°C, and ground for a certain period of time in an agate mortar. The obtained samples were used to measure their photocatalytic activity and characterization. Ball milling time is 3h, 6h, 12h, 24h, p-CuBi 2 o 4 Doping amounts (mass percentages) are 2%, 5%, 10%, 20%, 30%, 40% and 50%, respectively. When the ball milling time is 6h, the light time is 20min, the amount of catalyst is 2.0g / L, Cr 2 o 7 2- and methyl orange at an initial concentration of 2.9×10 -5 and 1×10 -5 mol / L, no matter it is illuminated by visible light or ultraviolet light, the photocatalyst p-CuBi 2 o 4 / n-TiO 2 than pure TiO 2 The activity is much higher, and in p...

Embodiment 2

[0012] Embodiment two: prepare CaFe by above-mentioned same method 2 o 4 The doping amount (mass percentage) is respectively 0.0%, 0.2%, 0.5%, 1.0%, 2.0%, 5.0%, 10.0% composite photocatalyst p-CaFe 2 o 4 / n-ZnO. When p-CaFe 2 o 4 When the content is 1.0wt.%, p-CaFe 2 o 4 The photocatalytic activity of / n-ZnO reaches the maximum, and the photocatalytic oxidation rate of methyl orange is 83.4%, while that of pure ZnO is 50.1%.

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Abstract

The invention relates to a novel method for preparing compound high-activity photocatalyst, which belongs to the field of novel material preparation. The method is characterized in: 1) a mechanical chemical method (ball milling method) adopted for preparation; 2) photocatalyst, namely the catalyst capable of showing activity only under the irradiation of ultraviolet light or visible light; 3) multi-component property, namely the capability of forming compound-component multi-junction coupled photocatalyst; and 4) high activity, namely the activity of the prepared photocatalyst is improved to a great extent compared with that of photocatalysts prepared by other methods. The method has the characteristics of easy control, mild reaction conditions, simple post-treatment, convenience for large-scale production, easy operation and the like. The photocatalyst prepared by the method has average grain size between 30 and 50 nm, high photocatalytic activity and good reproducibility.

Description

technical field [0001] The invention relates to a new method for preparing a composite high-activity photocatalyst, which belongs to the field of new material preparation. Background technique [0002] Photocatalysis has become one of the rapidly developing research fields in physical chemistry due to its broad application prospects in major fields such as environmental pollution control, photolysis of water and hydrogen production from biomass, and dye-sensitized solar cell manufacturing. Obtaining photocatalytic materials with high quantum efficiency and high solar energy utilization is the core and key issue of whether photocatalytic technology can finally be applied in practice, so it has always been the focus of photocatalytic science and technology research and development. In the past two decades, many scientists at home and abroad have carried out a large number of extensive researches on how to obtain high-efficiency photocatalytic materials. So far, the single oxi...

Claims

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Application Information

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IPC IPC(8): B01J37/34B01J21/18B01J27/00B01J27/06B01J27/02B01J21/06B01J23/06
Inventor 陈士夫刘伟
Owner 淮北煤炭师范学院
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