A kind of calcium titanate/calcium oxide composite photocatalyst and its preparation method and application

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, cheap and easy-to-obtain raw materials, and reduce production costs

Inactive Publication Date: 2015-09-30
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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  • A kind of calcium titanate/calcium oxide composite photocatalyst and its preparation method and application
  • A kind of calcium titanate/calcium oxide composite photocatalyst and its preparation method and application
  • A kind of calcium titanate/calcium oxide composite photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Dissolve 0.0491mol of butyl titanate in 80ml of absolute ethanol, ultrasonicate for 1h, and let stand for 12h;

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

[0043] (3) Under full stirring, the solution obtained in step (2) is added dropwise to the solution obtained in step (1), and stirring is continued for 1 h, wherein the molar ratio of calcium to titanium is 1:1;

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

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

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

[0047] 10 mg of ca...

Embodiment 2

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

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

[0051] (3) Under full stirring, the solution obtained in step (2) is added dropwise to the solution obtained in step (1), and stirring is continued for 1 h, wherein the molar ratio of calcium to titanium is 1:1;

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

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

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

[0055] 2 mg of...

Embodiment 3

[0057] (1) Dissolve 0.0491mol of butyl titanate in 80ml of absolute ethanol, ultrasonicate for 1h, and let stand for 12h;

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

[0059] (3) Under full stirring, the solution obtained in step (2) is added dropwise to the solution obtained in step (1), and stirring is continued for 1 h, wherein the molar ratio of calcium to titanium is 1:1;

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

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

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

[0063] 2 mg ...

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PUM

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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 particularly relates to a preparation method of a calcium titanate / calcium oxide composite photocatalyst and use thereof. Background technique [0002] 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 has been paid more and more attention by people. The widely used semiconductor photocatalysts 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 optoelectronic properties, but its two defects limit its practical application: one is TiO 2 The band gap is wide (3.2eV), and can only be excited by ultraviolet light with a wavelength less than 387nm; second, the electrons and holes ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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