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Preparation method of diatomite/(GR+TiO2) composite photocatalyst

A technology of diatomite and composite light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and other chemical processes. The effect of improving adsorption efficiency

Active Publication Date: 2017-11-07
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with existing methods, the diatomite / (GR+TiO2 prepared by the method of the present invention 2 ) composite photocatalyst, which can effectively improve the affinity between particles and organic matter, adsorption efficiency and photocatalytic degradation rate under visible light conditions, and can effectively solve the problem of difficult separation of catalyst and water; the method does not produce pollution in the production process and is suitable for industrialization Production

Method used

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  • Preparation method of diatomite/(GR+TiO2) composite photocatalyst
  • Preparation method of diatomite/(GR+TiO2) composite photocatalyst

Examples

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Effect test

Embodiment 1

[0029] Select raw materials according to the following requirements:

[0030] 1) Diatomite: finely purified diatomite, fineness 80 mesh, silicon dioxide content 80%;

[0031] 2) tetrabutyl titanate: technically pure;

[0032] 3) Graphene: graphene oxide;

[0033] 4) absolute ethanol: industrial pure;

[0034] 5) Acetic acid: industrial grade.

[0035] The method comprises the steps of:

[0036] 1) Measure 15mL of tetrabutyl titanate, 75mL of absolute ethanol, 7.5mL of distilled water and 1.5mL of acetic acid. TiO 2 Precursor gel, set aside;

[0037] 2) Weigh 30g of purified diatomite powder, 0.8g of graphene, and weigh TiO 2 Precursor gel, converted into 8g of titanium dioxide, add appropriate amount of water to stir and mix the three, put it in a high-pressure reactor, and react at 150°C for 12 hours under magnetic stirring;

[0038] 3) After drying the mixed solution at 60°C, place it in a nitrogen atmosphere furnace, and keep it at 650°C for 2 hours to obtain diatom...

Embodiment 2

[0041] Select raw materials according to the following requirements:

[0042] 1) Diatomite: finely purified diatomite with a fineness of 800 mesh and a silicon dioxide content of 86%;

[0043] 2) tetrabutyl titanate: technically pure;

[0044] 3) Graphene: graphene oxide;

[0045] 4) absolute ethanol: industrial pure;

[0046] 5) Acetic acid: industrial grade.

[0047] The method comprises the steps of:

[0048] 1) Measure 5mL of tetrabutyl titanate, 65mL of absolute ethanol, 6mL of distilled water and 1mL of acetic acid. 2 Precursor gel, set aside;

[0049] 2) Weigh 85g of purified diatomite powder, 1.5g of graphene, and weigh TiO 2 Precursor gel, converted into 5g of titanium dioxide, add appropriate amount of water to stir and mix the three, put it in a high-pressure reactor, and react at 20°C for 1 hour under magnetic stirring;

[0050] 3) After drying the mixed solution at 80°C, place it in a nitrogen atmosphere furnace, and keep it at 300°C for 1 hour to obtain di...

Embodiment 3

[0052] Select raw materials according to the following requirements:

[0053]1) Diatomite: Finely purified diatomite with a fineness of 1250 mesh and a silicon dioxide content of 92%;

[0054] 2) tetrabutyl titanate: technically pure;

[0055] 3) Graphene: graphene oxide;

[0056] 4) absolute ethanol: industrial pure;

[0057] 5) Acetic acid: industrial grade.

[0058] The method comprises the steps of:

[0059] 1) Measure 10mL of tetrabutyl titanate, 70mL of absolute ethanol, 10mL of distilled water and 5mL of acetic acid. 2 Precursor gel, set aside;

[0060] 2) Weigh 95g of purified diatomite powder, 2.5g of graphene, and weigh TiO 2 Precursor gel, converted into 2.5g of titanium dioxide, add appropriate amount of water to stir and mix the three, put it in a high-pressure reactor, and react at 200°C for 30h under magnetic stirring;

[0061] 3) After the mixed solution was dried at 70°C, it was placed in a nitrogen atmosphere furnace, and kept at 800°C for 100 hours to...

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Abstract

The invention discloses a preparation method of a diatomite / (GR+TiO2) composite photocatalyst. Diatomite subjected to fine purification and pore structure improvement as a carrier and tetrabutyl titanate as a titanium source are doped with graphene so that the diatomite / (GR+TiO2) composite photocatalyst is obtained. The diatomite / (GR+TiO2) composite photocatalyst can effectively improve the affinity between the particles and the organic substance, the adsorption efficiency and the photocatalytic degradation rate under the visible light condition, and can effectively solve the problem that the catalyst is difficult to separate from the water. The method does not generate pollution in the production process and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials and composite photocatalysts, in particular to a diatomite / (GR+TiO 2 ) preparation method of composite photocatalyst. Background technique [0002] Photocatalyst is a material carrier for photocatalytic treatment of pollutants in sewage and exhaust gas, and its performance determines the efficiency and cost of photocatalytic treatment of sewage and exhaust gas. Compared with the traditional chemical oxidation method, biological treatment method and high-temperature incineration method, semiconductor photocatalytic technology can completely degrade pollutants in air and water under normal temperature and pressure by using solar energy, and there is no secondary pollution. An ideal environmental governance technology. Among semiconductor photocatalysts, titanium dioxide has become a research hotspot in the field of heterogeneous photocatalysis due to its che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J20/20B01J20/30
CPCB01J20/06B01J20/14B01J20/20B01J21/18B01J35/39
Inventor 王丽娟杜高翔左然芳宋锐
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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