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Cuprous oxide-titanium dioxide composite structure and preparation method thereof

A technology of cuprous oxide and titanium dioxide, applied in the field of catalysis, to achieve the effect of low raw material price, good monodispersity and large specific surface area

Active Publication Date: 2014-07-30
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Moreover, the above cuprous oxide plays a photocatalytic role in a solid form, while cuprous oxide with a hollow structure has never been reported to play a role in this field

Method used

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  • Cuprous oxide-titanium dioxide composite structure and preparation method thereof
  • Cuprous oxide-titanium dioxide composite structure and preparation method thereof
  • Cuprous oxide-titanium dioxide composite structure and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0056] The synthesis of embodiment 1 cuprous oxide hollow sphere

[0057] Under the condition of water bath at 60°C, take 300ml, 0.1mol / L cetyltrimethylammonium bromide, 0.450g copper sulfate pentahydrate respectively, add them to a 500ml three-necked flask in turn, stir in a nitrogen atmosphere for 30min, and pour into the three-necked flask. Add 10ml, 0.45mol / L of newly configured ascorbic acid solution dropwise into the bottle, and you can find that the solution turns from light blue to colorless. After stirring for 30min, add 30ml, 0.6mol / L dropwise into the three-necked bottle. L of sodium hydroxide solution. After adding sodium hydroxide solution, it can be found that bright yellow precipitate cuprous oxide is formed. After separation, it was washed several times with deionized water and ethanol successively to obtain fresh bright yellow cuprous oxide. Scanning electron microscope and transmission electron microscope photos are attached figure 1 And attached figure ...

Embodiment 2

[0058] Example 2 Synthesis of cuprous oxide-titanium dioxide composite structure hollow spheres

[0059] The above bright yellow precipitate (containing about 0.1g of cuprous oxide) was dispersed in 100ml of ethanol, sonicated for 30min, and 10ml of 0.018mol / L tetrabutyl titanate ethanol solution was added dropwise, stirred for 30min, and sonicated for 30min. Add 10 ml of an ethanol solution with a volume ratio of 0.024 water to the suspension under vigorous stirring, stir for 30 minutes, and ultrasonically treat for 30 minutes, so that amorphous titanium dioxide is deposited on the surface of cuprous oxide. After washing several times with ethanol, the obtained catalyst was dried in a vacuum oven at 50 °C for 5 hours.

[0060] image 3 A scanning electron microscope picture of cuprous oxide titanium dioxide core-shell hollow spheres prepared in this example; Figure 4 A transmission electron microscope picture of cuprous oxide titanium dioxide core-shell hollow spheres prep...

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Abstract

The invention relates to a cuprous oxide-titanium dioxide composite structure and a preparation method thereof. The cuprous oxide-titanium dioxide composite structure is characterized in that cuprous oxide hollow nano-spheres are taken as a kernel, and amorphous titanium dioxide is taken as a shell to coat an outer layer of cuprous oxide. The structure can be applied to a heterogeneous catalyst for preparing methane from carbon dioxide in a photocatalytic reduction manner, and the catalytic efficiency of a product is obviously higher than that of pure cuprous oxide hollow spheres. The preparation method comprises the following steps: (1) preparing cuprous oxide hollow spheres of different sizes by virtue of a soft template growth method; and (2) growing amorphous titanium dioxide on the surface of cuprous oxide by virtue of hydrolytic action of tetrabutyl titanate. The preparation method is simple and feasible and is good in repeatability; the prepared hollow sphere structure is good in monodispersity, and the thickness of a titanium dioxide shell layer can be controlled by regulating the ratio of reactants.

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to a composite structure of cuprous oxide and titanium dioxide and a preparation method thereof. Background technique [0002] In recent years, the greenhouse effect has received widespread attention, and the emission of carbon dioxide, the main greenhouse gas, is mainly due to the combustion of ore energy. However, mineral energy will still be the main energy source in the next few decades. Therefore, in recent decades, various emission reduction technologies, such as carbon dioxide adsorption storage and the use of carbon dioxide as a raw material to produce chemical products, have become research hotspots. Among these technologies, the photocatalytic reduction of carbon dioxide to high value-added chemicals such as methane is of great economic value. [0003] However, the efficiency of current photocatalytic reduction of carbon dioxide is generally low. At present, there a...

Claims

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Application Information

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IPC IPC(8): B01J23/72C07C9/04C07C1/12
Inventor 毕凤贺涛刘薇
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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