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Preparation method of titanium oxide/calcium oxide/silicon oxide composite photocatalytic material in hollow structure

A composite photocatalysis and silicon oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve problems such as environmental pollution, achieve strong operability, Wide application prospects, the effect of accelerating the rate of chemical reactions

Inactive Publication Date: 2018-07-13
NATURE ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the direct application of semiconductor photocatalysis to NOx treatment has the following main technical obstacles: photocatalytic oxidation of NOx to NO 3 - To go through many intermediate steps, there will be some harmful intermediate products, such as about 20% of NO is oxidized to NO 2 , and is released, it will not only pollute the environment

Method used

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  • Preparation method of titanium oxide/calcium oxide/silicon oxide composite photocatalytic material in hollow structure
  • Preparation method of titanium oxide/calcium oxide/silicon oxide composite photocatalytic material in hollow structure

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preparation example Construction

[0030] The preparation method according to the present invention adopts TiO 2 And CaO as the core material, the outer wrapping SiO 2 The scheme effectively realizes the decomposition of NOx, and at the same time ensures that the organic resin material of the coating base material will not be corroded. Among them, CaO, as the core material, has a strong basicity, which can be combined with the NO produced by the photocatalytic process. 3 - The root ions react to form Ca(NO 3 ) 2 , not only can accelerate the chemical reaction rate of the photocatalytic process, but also avoid HNO 3 Corrosion to the base.

[0031] In addition, the porous structure of the silica shell itself can absorb gaseous pollutants and speed up the reaction rate. At the same time, it can isolate the oxidation reaction center from the organic substrate to prevent base corrosion, and can also avoid the volume change of the active filler calcium oxide during the chemical reaction. And acid-base changes d...

Embodiment 1

[0039] 1) Add 0.1 mol of titanium tetrachloride dropwise to 1000ml of pure water in an ice-water bath to obtain Ti 4+ Ion concentration is in the titanium liquid of 0.1mol / L, then adds analytically pure calcium chloride 0.56g thereinto, obtains Ca 2+ Ca / Ti composite solution with an ion concentration of 0.5mol / L, Ti 4+ Ions and Ca 2+ The molar ratio of ions is 1:5;

[0040] 2) Add 10ml of hydrogen peroxide with a mass percentage of 30% to it to obtain an orange solution, and then dropwise add 10 ml of ammonia water with a mass percentage of 10% to obtain an emulsion;

[0041] 3) Add 500ml of ethanol to the emulsion again, under the condition of vigorous stirring at room temperature, add 2ml of 5ml of tetrahexyloxysilane with a volume percentage of 37.5% dropwise, the organic silane compound and the titanium / calcium-peroxide-ammonia compound are slightly The mass ratio of the balls is about 1:3, and the reaction takes 12 hours.

[0042] 4) The reaction product was centrifug...

Embodiment 2

[0044] Except Ti in step 1) 4+ Ions and Ca 2+ The molar ratio of ions was controlled to be 1:8, and the titanium oxide / calcium oxide / silicon oxide composite photocatalytic material was prepared in the same manner as in Example 1.

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Abstract

The invention discloses a preparation method of a titanium oxide / calcium oxide / silicon oxide composite photocatalytic material in a hollow structure. The preparation method comprises the following steps: (1) preparing a titanium and calcium peroxide compound precursor; (2) preparing titanium and calcium compound sol; (3) cladding silicon oxide; and (4) sintering. The preparation method adopts direct synthesis through a one-pot method at a liquid phase, and the requirement on equipment is low; the method has the advantages of simple procedure, high operability, relatively low cost, suitabilityfor batch preparation, industrial production possibility and extensive application prospect.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a method for preparing a titanium oxide / calcium oxide / silicon oxide composite photocatalytic material with a hollow structure for purifying and eliminating nitrogen oxides, which are source substances of smog. Background technique [0002] In cities, motor vehicles have become the largest source of local pollution sources of smog (including primary and secondary particles). Major sources of motor vehicle air pollutants include, for example, carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). HC and NOx not only cause PM2.5 pollution, but also form ozone (O 3 ) is the main precursor of pollution. The reaction of NOx and VOC in the presence of sunlight leads to photochemical haze pollution. [0003] Heterogeneous photocatalytic technology is an emerging environmental protection technology that effectively removes chemical pollutants, and it can accel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02B01J35/10B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/02B01J37/0228B01J37/086B01J37/088B01J2523/00B01J35/398B01J35/39B01J2523/23B01J2523/41B01J2523/47
Inventor 冯泽云
Owner NATURE ENVIRONMENTAL PROTECTION TECH
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