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Preparation method for hollow carbon/titanium dioxide composite nano material

A technology of composite nanomaterials and titanium dioxide, which is applied in the field of preparation of hollow carbon/titanium dioxide composite nanomaterials, can solve the problems of low catalytic reaction efficiency, low utilization rate of sunlight, increased energy consumption, etc., so as to avoid the cumbersome removal of hard templates. , to achieve economical reaction, the effect of inhibiting the rate of hydrolysis

Inactive Publication Date: 2014-02-19
SHANGHAI UNIV
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Problems solved by technology

Nevertheless, TiO 2 There are still some shortcomings in itself: first, the band gap is wide, so the utilization rate of sunlight is low, and the catalytic reaction efficiency is not high, which limits its application. Second, electron holes are easy to recombine light and the spectral absorption range is narrow. Easy to inactivate
[0003] At present, the preparation of hollow carbon / titanium dioxide nanomaterials mainly adopts the method of hard template method and high temperature pyrolysis carbon precursor, but the conventional hard template method must use strong acid or strong base to remove the template, which not only increases the cost but also cumbersome operation , time-consuming and labor-intensive, which is not conducive to environmental protection; and the method of high-temperature pyrolysis virtually increases a large amount of energy consumption

Method used

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  • Preparation method for hollow carbon/titanium dioxide composite nano material
  • Preparation method for hollow carbon/titanium dioxide composite nano material
  • Preparation method for hollow carbon/titanium dioxide composite nano material

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preparation example Construction

[0015] Preparation of carbon-coated silica nanomaterials Reference: Antonio B. Fuertes, et al., Chem.Commun ., 2012, 48, 6124-6126. The specific steps are:

[0016] a. Measure 40 mL of a mixture of ethanol (ethanol) and deionized water (the volume ratio of ethanol and water is 2:1), add 1.3 mL of ammonia water (NH 3 ·H 2 O), mix evenly, and stir at 30 °C for 0.5 h; measure 1.4 mL tetraethyl orthosilicate (TEOS) and add it to the above solution, after mixing, weigh 0.2 g resorcinol with an electronic balance, add After completely dissolving, add 0.3 mL formaldehyde solution with a concentration of 37 wt%, and continue to react for 24 h;

[0017] b. Put the above mixed solution into a 100 mL autoclave lined with polytetrafluoroethylene, and react at 110 °C for 24 h; , drying and other steps to obtain the required template for the preparation of the present invention—carbon-coated silica nanomaterials;

Embodiment 1

[0019] a. Use an electronic balance to accurately weigh 0.1 g of the carbon-coated silica nanomaterial prepared in the previous step, add it to 10 mL of deionized water, and ultrasonically disperse it evenly;

[0020] b. Accurately weigh 2.5 mmol titanium tetrafluoride (TiF 4 ) into 10 mL of ethanol, ultrasonically dispersed evenly, and slowly dripped drop by drop into the suspension in the previous step under the condition of stirring. In a tetrafluoroethylene-lined autoclave, react at 180 °C for 6 h;

[0021] c. After the reaction is completed, the product is taken out from the reaction kettle, and the hollow carbon / titanium dioxide composite material prepared by the present invention is obtained through steps such as centrifugation, washing, drying, and roasting under a nitrogen-protected environment.

[0022] The prepared samples were characterized for their physical properties, and some of the results are shown in the accompanying drawings. The obtained material has a h...

Embodiment 2

[0024] Accurately weigh 2.5 mmol titanium tetrafluoride (TiF 4 ) into 10 mL of deionized water, ultrasonically dispersed evenly, and slowly dripped drop by drop into the suspension in the previous step under the condition of stirring. The reaction was carried out at 180 °C for 6 h in a polytetrafluoroethylene-lined autoclave.

[0025] The obtained result is quite different from Example 1, the difference is that the obtained TiO 2 Because the particles are large and uneven in shape, they cannot be evenly coated on the surface of the template.

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Abstract

The invention relates to a preparation method for a hollow carbon / titanium dioxide composite nano material. TiO2 (titanium dioxide) is generated on the surface of a carbon shell by taking TiF4 (titanium tetrafluoride) as a titanium source, an ethanol / water mixed solution as a solvent and silicon dioxide wrapped by carbon as a hard template through hydrolysis of the titanium source by an in-situ etching method, and the silicon dioxide template can be effectively removed through byproducts HF produced in a reaction process, so that the carbon / titanium dioxide composite nano material which has a hollow characteristic and a uniform appearance can be prepared. The method disclosed by the invention can be used for preparing the hollow carbon / titanium dioxide composite nano material with a good crystallization effect and high performance; furthermore, the byproducts HF can be fully used; therefore, the cost is saved, the efficiency is improved, and the environment pollution is effectively prevented.

Description

technical field [0001] The invention relates to a preparation method of hollow carbon / titanium dioxide composite nanometer material. Background technique [0002] Nano-TiO 2 Because of its outstanding advantages such as wide sources, low cost, stable structure and excellent performance, it is favored by people. It is one of the most researched and most promising high-tech materials in the field of environmental protection and energy technology in recent years. . Nevertheless, TiO 2 There are still some shortcomings in itself: first, the band gap is wide, so the utilization rate of sunlight is low, and the catalytic reaction efficiency is not high, which limits its application; Easily deactivated. In order to further improve its effective utilization rate and expand its application range, people have tried a variety of modification methods, among which TiO 2 Composite research with other materials is more concerned, mainly because composite materials can fully combine na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08C01B31/02B82Y30/00B82Y40/00C01B32/05
Inventor 张海娇焦正郭敬新胡乐缪彧徐慧娟
Owner SHANGHAI UNIV
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