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A kind of ZNO photocatalyst and preparation method thereof

A photocatalyst and atmosphere technology, applied in the field of photocatalytic materials research, can solve the problems of high photocorrosion of photogenerated electron-hole recombination rate, hindering the application of ZnO, etc., achieve high practical value and application prospect, cheap raw materials, reduce product cost effect

Inactive Publication Date: 2015-08-05
TSINGHUA UNIV
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Problems solved by technology

The traditional photocatalyst ZnO has been widely used in the field of photocatalysis due to its non-toxicity, cheapness and stable properties, but it can only respond in the ultraviolet range, the recombination rate of photogenerated electron-hole pairs is high and it is photocorrosive. will seriously hinder the application of ZnO in photocatalysis

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  • A kind of ZNO photocatalyst and preparation method thereof
  • A kind of ZNO photocatalyst and preparation method thereof
  • A kind of ZNO photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, H of ZnO 2 -TPR

[0024] Weigh 0.050g of nano-ZnO powder sample into a U-shaped quartz tube, and install it to the corresponding position of the chemical adsorption instrument, feed He gas inward and program the temperature to 130°C, the heating rate is 10°C / min, and the gas flow rate is 25ml / min After reaching 130°C, continue to flow He gas for 1h (to remove impurities on the surface of the catalyst). After the sample is cooled to room temperature under He atmosphere, open the ChemiSorb TPx software, set the corresponding program, and then flow Ar and H 2 (the molar ratio is 9:1) mixed gas, the system is heated up to 600°C, the heating rate is 10°C / min, the gas flow rate is 25ml / min, after reaching 600°C, continue to ventilate for 5min, and then cool to room temperature to obtain ZnO H 2 -TPR curves such as figure 1 As shown, the temperature range is 0~600℃.

[0025] Depend on figure 1 It can be known that the temperature range of the hydrogenation r...

Embodiment 2

[0026] Example 2, Preparation of Surface Oxygen Defect ZnO Samples Generated by Hydrogenation Reduction at Different Temperatures

[0027] Weigh 0.50g of nano-ZnO powder sample into a U-shaped quartz tube, and install it to the corresponding position of the chemical adsorption instrument, pass He gas inside and program the temperature to 130°C, the heating rate is 10°C / min, and the gas flow rate is 25ml / min , after reaching 130°C, continue to flow He gas for 1h (to remove impurities on the surface of the catalyst), and after the sample is cooled to room temperature under He atmosphere, then flow Ar and H 2 (9:1 molar ratio) mixed gas, the temperature of the system was programmed to rise to 455°C, 460°C, 465°C, 470°C and 475°C respectively, the heating rate was 10°C / min, the gas flow rate was 25ml / min, and ventilation was maintained. 5h, then cooled to room temperature.

Embodiment 3

[0028] Example 3, Preparation of Surface Oxygen Defect ZnO Samples Generated by Hydrogenation Reduction at Different Time

[0029] Weigh 0.50g of nano-ZnO powder sample into a U-shaped quartz tube, and install it to the corresponding position of the chemical adsorption instrument, pass He gas inside and program the temperature to 130°C, the heating rate is 10°C / min, and the gas flow rate is 25ml / min , after reaching 130°C, continue to flow He gas for 1h (to remove impurities on the surface of the catalyst), and after the sample is cooled to room temperature under He atmosphere, then flow Ar and H 2 (9:1 molar ratio) mixed gas, the temperature of the system was raised to 465°C, the heating rate was 10°C / min, the gas flow rate was 25ml / min, the aeration time was 1h, 3h, 5h, 7h and 9h, and then cooled to room temperature.

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Abstract

The invention discloses a ZnO photocatalyst and a preparation method of the ZnO photocatalyst. According to the preparation method, nano ZnO powder is hydrogenated and reduced in a reduction atmosphere to obtain the ZnO photocatalyst. The prepared ZnO photocatalyst has relatively high visible-light photocatalytic activity and is improved in ultraviolet light photocatalytic activity to some extent. The preparation method provided by the invention has the advantages that raw materials are cheap, the process is simple and the effect is outstanding, so the product cost is effectively reduced, the sunlight utilization rate is improved and high application value and application prospect are achieved. The invention provides a new method for expanding photoabsorption ranges of other photocatalysts and also lays a foundation for the wide practical application of photocatalysts.

Description

technical field [0001] The invention relates to a ZnO photocatalyst and a preparation method thereof, belonging to the technical field of photocatalytic material research. Background technique [0002] Photocatalytic technology is widely used in the environment, energy, etc., and the performance of photocatalytic materials is crucial to photocatalytic technology. The traditional photocatalyst ZnO has been widely used in the field of photocatalysis due to its non-toxicity, cheapness and stable properties, but it can only respond in the ultraviolet range, the recombination rate of photogenerated electron-hole pairs is high and it is photocorrosive. It will seriously hinder the application of ZnO in photocatalysis. Therefore, it is very necessary to conduct in-depth research on ZnO photocatalysts, improve their photocatalytic activity, expand their photocatalytic response range, and inhibit their photocorrosion. Some researchers have done a lot of research on ZnO, and have ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01J37/18
Inventor 朱永法吕艳辉朱艳艳
Owner TSINGHUA UNIV
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