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Monodispersed spherical titanium dioxide core-shell structure composite material and preparation method thereof

A titanium dioxide, core-shell structure technology, applied in the field of monodisperse spherical titanium dioxide core-shell structure composite materials

Inactive Publication Date: 2015-05-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to overcome the performance parameters of the existing visible light activity of titanium dioxide. The present invention provides a novel monodisperse spherical titanium dioxide core-shell structure composite material co-modified by non-metal and noble metal and its preparation method

Method used

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  • Monodispersed spherical titanium dioxide core-shell structure composite material and preparation method thereof
  • Monodispersed spherical titanium dioxide core-shell structure composite material and preparation method thereof
  • Monodispersed spherical titanium dioxide core-shell structure composite material and preparation method thereof

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preparation example Construction

[0047] The present invention also provides a method for preparing the monodisperse spherical titanium dioxide core-shell structure composite material co-modified by a novel non-metal and noble metal, comprising the following steps:

[0048] 1) Weighing 0.5-2 g of carbohydrate compounds and dissolving them in water to prepare an aqueous solution of carbohydrate compounds with a concentration of 0.1-5 mol / L and placing them in a hydrothermal reaction kettle. React at a temperature of 150-200°C for 10-20 hours (preferably 160-200°C closed reaction for 15-20 hours). After the reaction, centrifuge, wash, and dry at 60-100°C to obtain carbon spheres. Wherein the sugar compound concentration is preferably 0.8-3mol / L, the temperature is preferably 160-190°C, and the reaction time is preferably 16-18 hours;

[0049] 2) Prepare a certain amount of carbon spheres obtained into a 0.02-0.1 mol / L ethanol solution, and drop a certain amount (0.1-30 ml) of water into the solution. Add a cer...

Embodiment 1

[0065] 1) Weigh 0.5g of glucose and dissolve it in water to form a solution of 0.05 mol / L, and react in a closed manner at 200°C for 15 hours to obtain uniform monodisperse carbon spheres with a diameter of 1000nm;

[0066] 2) Dissolve a certain amount of the obtained carbon spheres in ethanol to form a 0.1 mol / liter solution, and add 3ml of deionized water. Take 0.5ml of tetrabutyl titanate and add it to the solution twice, and react at a certain temperature of 45°C for a period of time;

[0067] 3) Add 5ml of 2% hydrazine to the solution obtained in step 2), stir for 30min, add 0.5ml of 0.03mol / liter AgCl solution, and illuminate with a xenon lamp for 10-30min;

[0068] 4) Centrifuge the solution obtained in step 3), wash with ethanol, and then centrifuge again, repeating this several times;

[0069] 5) Dry the powder obtained in step 3) in an oven at temperatures of 100° C. and 500° C. (vacuum) for several hours to obtain a carbon-silver composite modified titanium dioxide...

Embodiment 2

[0078] 1) Weigh 0.5g of glucose and dissolve it in water to form a solution of 0.05 mol / L, and react in a closed manner at 180°C for 15 hours to obtain uniform monodisperse carbon spheres with a diameter of 500nm;

[0079]2) Dissolve a certain amount of the obtained carbon spheres in ethanol to form a 0.1 mol / liter solution, and add 3ml of deionized water. Take 0.5ml of tetrabutyl titanate and add it to the solution twice, and react at a certain temperature of 45°C for a period of time;

[0080] 3) Add 5ml of 2% hydrazine to the solution obtained in step 2), stir for 30min, add 0.5ml of 0.03mol / liter AgCl solution, and illuminate with a xenon lamp for 10-30min;

[0081] 4) Centrifuge the solution obtained in step 3), wash with ethanol, and then centrifuge again, repeating this several times;

[0082] 5) Dry the powder obtained in step 3) in an oven at temperatures of 100° C. and 500° C. (vacuum) for several hours to obtain a carbon-silver compound-modified titanium dioxide co...

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Abstract

The invention relates to a monodispersed spherical titanium dioxide core-shell structure composite material and a preparation method thereof. The monodispersed spherical titanium dioxide core-shell structure composite material comprises an inner core formed by monodispersed carbon spheres and a titanium dioxide shell layer covering the inner core, wherein noble metal is doped in the titanium dioxide shell layer.

Description

technical field [0001] The invention relates to a novel non-metallic and noble metal co-modified, monodisperse spherical titania core-shell structure composite material with visible light response and excellent photocatalytic performance with controllable size. Background technique [0002] TiO 2 Photocatalysts have received great attention due to their advantages of stability, non-toxicity, cheapness, and difficulty in producing secondary pollution. However, pure TiO 2 With a large band gap (Eg) (such as anatase Eg=3.2eV, rutile Eg=3.0eV), the excitation energy required to generate photogenerated carriers is relatively high, and generally only ultraviolet light with a wavelength below 380nm can be used. Light, and this part of energy accounts for less than 5% of solar energy, which is not conducive to the development and application of "clean" solar energy. At the same time, TiO 2 The photogenerated hole-electron pairs generated by excitation (the lifetime is generally at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50
Inventor 金平实陈荣祥纪士东
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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