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Preparation method of novel SiO2-coated TiO2 material

A new type of coating technology, applied in the field of photocatalysis, can solve the problems of affecting degradation efficiency, catalyst deactivation, insufficient adsorption capacity, etc., and achieve the effects of enhanced pollutant adsorption, large specific surface area, and wide use places

Active Publication Date: 2014-03-26
ZHEJIANG UNIV
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  • Description
  • Claims
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Problems solved by technology

However, there are still some challenges in the process of industrialization of this technology
If the concentration of organic pollutants in the environment is low, the adsorption capacity of traditional titanium dioxide materials is insufficient, thus affecting the overall degradation efficiency
In addition, the deposition of silicon-containing particles ubiquitous in the environment on the surface of the catalyst will cause catalyst deactivation

Method used

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  • Preparation method of novel SiO2-coated TiO2 material
  • Preparation method of novel SiO2-coated TiO2 material
  • Preparation method of novel SiO2-coated TiO2 material

Examples

Experimental program
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Embodiment 1

[0021] Add ethylenediamine to absolute ethanol to form an ethylenediamine ethanol solution with a concentration of 0.16 mol / L, and add butyl titanate to absolute ethanol to form a butyl titanate ethanol solution with a concentration of 170 mmol / L. Add 10 mL of butyl titanate ethanol solution dropwise to 8 mL of ethylenediamine ethanol solution and mix well. Under vigorous stirring conditions, 6 mL of distilled water was added to the above mixed solution and stirred for 2 h. The resulting mixed solution was added to a reaction kettle with a PTFE liner, hydrothermally reacted at 100 °C for 24 h, cooled naturally and centrifuged. Disperse 1 g of solid obtained by centrifugation into 300 g of absolute ethanol (380 mL), add 15.2 mL of distilled water and 19 mL of concentrated ammonia water and ultrasonically disperse for 30 min. Add 1.4 mL of ethyl silicate to the dispersed suspension, stir for 3 h, centrifuge, and wash the obtained solid particles with water until the pH value is...

Embodiment 2

[0024] Add ethylenediamine to absolute ethanol to form an ethylenediamine ethanol solution with a concentration of 0.01 mol / L, and add butyl titanate to absolute ethanol to form a butyl titanate ethanol solution with a concentration of 1 mmol / L. Add 10 mL of butyl titanate ethanol solution dropwise to 5 mL of ethylenediamine ethanol solution and mix well. Under the condition of vigorous stirring, add 2.5mL of distilled water into the above mixed solution and stir for 1 h, then add to the reaction kettle with PTFE liner, conduct hydrothermal reaction at 80 ℃ for 48 h, cool down naturally and centrifuge. Disperse 1 g of solid obtained by centrifugation into 10 g of absolute ethanol (12.7 mL), add 0.13 mL of distilled water and 0.64 mL of concentrated ammonia water, and ultrasonically disperse for 30 min. Add 0.27 mL of ethyl silicate to the dispersed suspension, stir for 1 h, centrifuge, and wash the obtained solid particles with water until the pH value is 6, centrifuge and dry...

Embodiment 3

[0026] Add ethylenediamine to absolute ethanol to form an ethylenediamine ethanol solution with a concentration of 6 mol / L, and add butyl titanate to absolute ethanol to form a butyl titanate ethanol solution with a concentration of 1000 mmol / L. Add 10 mL of butyl titanate ethanol solution dropwise to 20 mL of ethylenediamine ethanol solution and mix well. Under the condition of vigorous stirring, add 40mL of distilled water into the above mixed solution and stir for 3 hours, then add to the reaction kettle with PTFE liner, conduct hydrothermal reaction at 130 ℃ for 12 hours, cool down naturally and centrifuge. Disperse 1 g of solid obtained by centrifugation into 550 g of absolute ethanol (696 mL), add 139 mL of distilled water and 139 mL of concentrated ammonia water, and ultrasonically disperse for 60 min. 1.9 mL of ethyl silicate was added to the dispersed suspension, stirred for 5 h, centrifuged, and the obtained solid particles were washed with water until the pH value w...

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Abstract

The invention discloses a preparation method of a novel SiO2-coated TiO2 material. The method comprises the following steps: uniformly mixing a butyl titanate ethanol solution with an ethylenediamine ethanol solution, adding distilled water, and stirring for 1-3 hours; producing a hydrothermal reaction in a reaction kettle for 12-48 hours, conducting a centrifuging process, dispersing deposits into absolute ethanol, adding distilled water and strong ammonia water, and ultrasonically dispersing to obtain a suspension solution; adding ethyl silicate into the suspension solution, stirring for 1-5 hours, conducting a centrifuging process, washing until the pH value is 6-8, performing natural air-drying or drying on deposits, heating to 500-800 DEG C at the speed of 0.1-4 DEG C / min, and calcining at 500-800 DEG C for 10-240 minutes to obtain the novel SiO2-coated TiO2 material. The novel SiO2-coated TiO2 material is larger in specific surface area and degree of crystallinity; as the structure is that TiO2 is coated with SiO2, granules can be effectively prevented from making contact with the TiO2 surface and the catalyst deactivation is avoided.

Description

technical field [0001] The invention belongs to photocatalytic technology, in particular to a novel SiO 2 coated TiO 2 The method of preparation of the material. Background technique [0002] my country's environmental pollution is becoming more and more serious, and it is urgent to develop efficient and green environmental purification technologies. Titanium dioxide photocatalysis technology is one of the most promising environmental purification technologies. However, there are still some challenges in the process of industrialization of this technology. For example, the concentration of organic pollutants in the environment is low, and the adsorption capacity of traditional titanium dioxide materials is insufficient, which affects the overall degradation efficiency. In addition, the deposition of silicon-containing particles ubiquitous in the environment on the catalyst surface can cause catalyst deactivation. Therefore, it is necessary to develop new titanium dio...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J21/08
Inventor 朱利中吕金泽
Owner ZHEJIANG UNIV
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