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Calcium titanate/calcium oxide composite photocatalyst as well as preparation method and application thereof

A technology of calcium oxide and calcium titanate, applied in the field of photocatalysis, can solve the problem of low photocatalytic activity, achieve high photocatalytic activity, simple preparation process, and low equipment requirements

Inactive Publication Date: 2014-04-23
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using titanium source and soluble calcium salt as raw materials, a calcium titanate / calcium oxide composite photocatalyst with a layered microstructure was synthesized by controlling the molar ratio of Ca / Ti, calcination temperature, calcination time and aging time, overcoming the single pure The disadvantage of low photocatalytic activity of phase calcium titanate

Method used

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  • Calcium titanate/calcium oxide composite photocatalyst as well as preparation method and application thereof
  • Calcium titanate/calcium oxide composite photocatalyst as well as preparation method and application thereof
  • Calcium titanate/calcium oxide composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Dissolve 0.0491mol of butyl titanate in 80ml of absolute ethanol, sonicate for 1 hour and then stand for 12 hours;

[0042] (2) Add 0.0491mol calcium nitrate tetrahydrate solid to 80ml 95% ethanol solution, heat and stir at 60℃ to fully dissolve it, then add 15ml glacial acetic acid and stir well for 0.5h;

[0043] (3) Under full stirring, add the solution obtained in step (2) dropwise to the solution obtained in step (1), and continue to stir for 1 hour, where the molar ratio of calcium to titanium is 1:1;

[0044] (4) Aging the solution obtained in step (3) at room temperature for 24 hours;

[0045] (5) Put the obtained light yellow transparent gel in an oven and dry at 60°C to obtain a light yellow solid;

[0046] (6) Put the dry light yellow solid into a muffle furnace at 500°C and calcinate for 2h at a heating rate of 1°C / min. The white powder obtained is a calcium titanate / calcium oxide composite photocatalyst.

[0047] Add 10 mg of calcium titanate / calcium oxide com...

Embodiment 2

[0049] (1) Dissolve 0.0491mol of tetraisopropyl titanate in 80ml of absolute ethanol, sonicate for 1h and then stand for 12h;

[0050] (2) Add 0.0491mol calcium nitrate tetrahydrate solid to 80ml 95% ethanol solution, heat and stir at 60°C to fully dissolve it, then add 15ml glacial acetic acid and stir well for 0.5h;

[0051] (3) Under sufficient stirring, add the solution obtained in step (2) dropwise to the solution obtained in step (1), and continue to stir for 1 hour, where the molar ratio of calcium to titanium is 1:1;

[0052] (4) Aging the solution obtained in step (3) at room temperature for 24 hours;

[0053] (5) Put the obtained light yellow transparent gel in an oven and dry at 60°C to obtain a light yellow solid;

[0054] (6) Put the dry light yellow solid in a muffle furnace at 700°C for 2h, and the heating rate is 1°C / min. The white powder obtained is the calcium titanate / calcium oxide composite photocatalyst.

[0055] Add 2 mg of calcium titanate / calcium oxide composite p...

Embodiment 3

[0057] (1) Dissolve 0.0491 mol of butyl titanate in 80 ml of absolute ethanol, sonicate for 1 hour and then stand for 12 hours;

[0058] (2) Add 0.0491mol calcium chloride dihydrate solid to 80ml 95% ethanol solution, heat and stir at 60℃ to fully dissolve it, then add 15ml glacial acetic acid and stir well for 0.5h;

[0059] (3) Under full stirring, add the solution obtained in step (2) dropwise to the solution obtained in step (1), and continue to stir for 1 hour, where the molar ratio of calcium to titanium is 1:1;

[0060] (4) Aging the solution obtained in step (3) at room temperature for 24 hours;

[0061] (5) Put the obtained light yellow transparent gel in an oven and dry at 60°C to obtain a light yellow solid;

[0062] (6) Put the dry light yellow solid into a muffle furnace at 600°C and calcinate for 4h at a heating rate of 1°C / min. The white powder obtained is a calcium titanate / calcium oxide composite photocatalyst.

[0063] Add 2 mg of calcium titanate / calcium ox...

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Abstract

The invention provides a calcium titanate / calcium oxide composite photocatalyst as well as a preparation method and an application thereof. The preparation method comprises the following steps: dissolving a titanium source in absolute ethyl alcohol, performing ultrasonic treatment, adding a soluble calcium salt solution, continuously stirring for an hour, ageing the gel at room temperature for several hours, and drying the gel in a drying oven; and finally, putting the gel in a muffle furnace for roasting for 2-8 hours at the temperature of 500-900 DEG C, wherein the obtained white powder is the calcium titanate / calcium oxide composite photocatalyst. The composite photocatalyst prepared by the method is used for degrading organic pollutants in water. Compared with a commercial catalyst TiO2 (P25), the composite photocatalyst has higher photocatalytic activity.

Description

Technical field [0001] The invention belongs to the field of photocatalysis, and specifically relates to a preparation method and application of a calcium titanate / calcium oxide composite photocatalyst. Background technique [0002] The semiconductor photocatalytic oxidation technology, which uses semiconductors as photocatalysts and uses solar energy to degrade organic and inorganic pollutants, is an advanced technology that has emerged in recent years to effectively control air pollution and water pollution, and is increasingly being valued by people. Semiconductor photocatalysts widely used today are mainly transition metal oxides, such as TiO 2 , ZnO, WO 3 , Fe 2 O 3 Etc. where TiO 2 It has been widely studied for its excellent photoelectric properties, but its two defects limit its practical application: one is TiO 2 The band gap is relatively wide (3.2eV) and can only be excited by ultraviolet light with a wavelength of less than 387nm; the second is that the electrons and ...

Claims

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Application Information

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IPC IPC(8): B01J23/02C02F1/30C02F101/30
CPCY02W10/37
Inventor 蒋峰芝沙朝金刘城城卞龙春刘拥军袁波
Owner YUNNAN UNIV
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