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Method for preparing high-activity calcium titanate/calcium hydroxide mixed photocatalyst

A technology of calcium hydroxide and calcium titanate, applied in metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc. Coarsening and other problems, to achieve the effect of narrow particle size distribution, easy control of process conditions, and low preparation cost

Active Publication Date: 2016-10-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with solid-state reaction methods, sol-gel, co-precipitation, thermal decomposition and other methods have obvious advantages in component control and lower synthesis temperature, but still require high-temperature treatment to obtain titanium with good crystallinity. Calcium acid powder, and the high temperature treatment process will inevitably cause the coarsening and agglomeration of particles, which is not conducive to the photocatalytic process.

Method used

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  • Method for preparing high-activity calcium titanate/calcium hydroxide mixed photocatalyst
  • Method for preparing high-activity calcium titanate/calcium hydroxide mixed photocatalyst
  • Method for preparing high-activity calcium titanate/calcium hydroxide mixed photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 1) Weigh tetrabutyl titanate, add it to ethylene glycol methyl ether, and magnetically stir until dissolved to obtain a tetrabutyl titanate solution, and the Ti in the tetrabutyl titanate solution 4+ The ion concentration is 0.5mol / L;

[0034] 2) Under stirring, add an ammonia solution with a mass concentration of 30% to the tetrabutyl titanate solution prepared in step 1), precipitate, filter, and wash to obtain a titanium precipitate;

[0035] 3) Weigh calcium nitrate, add it to deionized water, and magnetically stir until dissolved to obtain an aqueous solution of calcium nitrate, and Ca in the aqueous solution of calcium nitrate 2+ The ion concentration is 2.5mol / L;

[0036] 4) Potassium hydroxide was weighed, added to deionized water, and magnetically stirred until dissolved to obtain an aqueous potassium hydroxide solution, the concentration of potassium hydroxide in the aqueous potassium hydroxide solution being 3.5mol / L;

[0037] 5) Add the titanium precipitat...

Embodiment 2

[0042] 1) Weigh tetrabutyl titanate, add it to ethylene glycol methyl ether, and magnetically stir until dissolved to obtain a tetrabutyl titanate solution, and the Ti in the tetrabutyl titanate solution 4+ The ion concentration is 0.6mol / L;

[0043] 2) Under stirring, add 1.5 mL of ammonia solution with a mass concentration of 30% to the tetrabutyl titanate solution prepared in step 1), precipitate, filter, and wash to obtain titanium precipitate;

[0044] 3) Weigh calcium nitrate, add it to deionized water, and magnetically stir until dissolved to obtain an aqueous solution of calcium nitrate, and Ca in the aqueous solution of calcium nitrate 2+ The ion concentration is 2.5mol / L;

[0045] 4) Potassium hydroxide was weighed, added to deionized water, and magnetically stirred until dissolved to obtain an aqueous potassium hydroxide solution, the concentration of potassium hydroxide in the aqueous potassium hydroxide solution being 2.5mol / L;

[0046] 5) adding the titanium pr...

Embodiment 3

[0050] 1) Weigh tetrabutyl titanate, add it to ethylene glycol methyl ether, and magnetically stir until dissolved to obtain a tetrabutyl titanate solution, and the Ti in the tetrabutyl titanate solution 4+ The ion concentration is 0.6mol / L;

[0051] 2) Under stirring, add 1.5 mL of ammonia solution with a mass concentration of 30% to the tetrabutyl titanate solution prepared in step 1), precipitate, filter, and wash to obtain titanium precipitate;

[0052] 3) Weigh calcium nitrate, add it to deionized water, and magnetically stir until dissolved to obtain an aqueous solution of calcium nitrate, and Ca in the aqueous solution of calcium nitrate 2+ The ion concentration is 2.5mol / L;

[0053] 4) Potassium hydroxide was weighed, added to deionized water, and magnetically stirred until dissolved to obtain an aqueous potassium hydroxide solution, the concentration of potassium hydroxide in the aqueous potassium hydroxide solution being 5 mol / L;

[0054] 5) Add the titanium precip...

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Abstract

The invention discloses a method for preparing a high-activity calcium titanate / calcium hydroxide mixed photocatalyst. The method comprises the steps that tetrabutyl titanate is dissolved in ethylene glycol monomethyl ether, and a tetrabutyl titanate solution is obtained; in a stirring state, hartshorn is added into the tetrabutyl titanate solution, precipitating, filtering and washing are carried out, and oxyhydroxide sediment of titanium is obtained; the oxyhydroxide sediment of titanium is added into a calcium nitrate water solution, stirring is carried out for 1 h to 5 h, then a potassium hydroxide water solution is added, stirring continues to be carried out for 1 h to 5 h, and precursor slurry is obtained; the precursor slurry is sealed and subjected to heat preservation for 6 h to 24 h at the temperature of 180 DEG C to 230 DEG C for hydro-thermal treatment, then cooling, washing, filtering and drying are carried out, and the target product is obtained. The high-activity calcium titanate / calcium hydroxide mixed photocatalyst good in crystallinity and dispersity and narrow in size distribution is prepared through a simple hydrothermal method, and ultraviolet light catalytic activity superior to that of current commercial P25 is achieved.

Description

technical field [0001] The invention relates to the technical field of photocatalyst preparation, in particular to a preparation method of a highly active calcium titanate / calcium hydroxide mixed photocatalyst. Background technique [0002] Calcium titanate (CaTiO 3 ) is a composite oxide with a typical perovskite structure, which was first discovered in minerals in 1839. CaTiO 3 It is widely used in electronic components and is the main component of synthetic rock used to store nuclear waste. At room temperature, CaTiO 3 It is an orthogonal structure, and the space group belongs to Pbnm. Calcium Hydroxide (Ca(OH) 2 ), commonly known as slaked lime, is a hexagonal layered structure, which has attracted widespread attention because of its wide use in environmental protection, medicine, building materials, chemical industry and other fields. [0003] The traditional method of synthesizing calcium titanate is the solid phase sintering method, that is, CaCO 3 or CaO and T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02
CPCB01J23/02B01J37/10B01J35/39B01J35/40
Inventor 魏晓裴静远孟杰李吉学张泽
Owner ZHEJIANG UNIV