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A kind of preparation method of titanium dioxide/hydroxyapatite composite photocatalyst

A technology of hydroxyapatite and titanium dioxide, which is applied in the direction of chemical instruments and methods, and other chemical processes, can solve the problems of poor combination effect and uneven composition of titanium dioxide and hydroxyapatite, and achieve excellent photocatalytic performance and raw material The effect of low cost and broad application prospects

Active Publication Date: 2016-07-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Description
  • Claims
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Problems solved by technology

[0006] The technical purpose of the present invention is to provide a method for preparing titanium dioxide / hydroxyapatite composite photocatalytic material with uneven composition and poor combination effect of titanium dioxide and hydroxyapatite obtained by the current preparation method. A new method of limestone composite photocatalyst, the combination of titanium dioxide and hydroxyapatite in the composite powder obtained by this method is well combined, and the composition is uniform, so it has strong catalytic degradation ability

Method used

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  • A kind of preparation method of titanium dioxide/hydroxyapatite composite photocatalyst
  • A kind of preparation method of titanium dioxide/hydroxyapatite composite photocatalyst
  • A kind of preparation method of titanium dioxide/hydroxyapatite composite photocatalyst

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Embodiment 1

[0030] In the present embodiment, the preparation method of titanium dioxide / hydroxyapatite composite photocatalyst comprises the following steps:

[0031] (1) Stir and drop ammonium dihydrogen phosphate solution with a concentration of 0.15 mol / L into a calcium nitrate solution with a concentration of 0.25 mol / L at a rate of 2 ml / min, so that the molar ratio of calcium and phosphorus in the mixed solution is 5 : 3, stirring and dripping ammoniacal liquor in this process keeps being 11 to regulate the pH value of mixed solution, prepares the hydroxyapatite precursor slurry; In this process, stirring speed is 200 rpm;

[0032] (2) Keep the hydroxyapatite precursor slurry matured for 1.5 hours, then stir and add titanium dioxide P25 powder into the hydroxyapatite precursor slurry. The particle size of the P25 powder is about 21nm. Theoretically, the mass ratio of the hydroxyapatite precursor slurry should be 2:1, and the hydroxyapatite precursor slurry continues to mature in the...

Embodiment 2

[0038] In this example, the preparation method of the titanium dioxide / hydroxyapatite composite photocatalyst is basically the same as that of Example 1, the difference is that in step (2), the hydroxyapatite precursor slurry is first kept matured for 5 hours, and then Add titanium dioxide P25 powder.

[0039] The microscopic morphology of the titanium dioxide / hydroxyapatite composite powder prepared in this example is similar to that shown in Figure 2(a). The composite powder is a spherical particle, and the hydroxyapatite is coated on the surface of titanium dioxide with good coating performance. The particle size of the composite powder is uniform.

[0040] The XRD spectrum of the titanium dioxide / hydroxyapatite composite powder prepared in this example is similar to that shown in Figure 3 (a), and there are characteristic peaks of anatase titanium dioxide, rutile phase titanium dioxide and hydroxyapatite in the spectrum, indicating that the composite The powder is compose...

Embodiment 3

[0043] In this example, the preparation method of the titanium dioxide / hydroxyapatite composite photocatalyst is basically the same as that of Example 1, except that in step (1), ammonia water is stirred and dropped to adjust the pH value of the mixed solution to 14; and In step (2), first keep the hydroxyapatite precursor slurry for aging for 2 hours, and then add titanium dioxide P25 powder.

[0044] The microscopic morphology of the titanium dioxide / hydroxyapatite composite powder prepared in this example is similar to that shown in Figure 2(a). The composite powder is a spherical particle, and the hydroxyapatite is coated on the surface of titanium dioxide with good coating performance. The particle size of the composite powder is uniform.

[0045] The XRD spectrum of the titanium dioxide / hydroxyapatite composite powder prepared in this example is similar to that shown in Figure 3 (a), and there are characteristic peaks of anatase titanium dioxide, rutile phase titanium di...

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Abstract

The invention provides a preparation method of titanium dioxide / hydroxyapatite composite powder. The method is to add titanium dioxide powder in the process of preparing hydroxyapatite by wet chemical reaction method, so that hydroxyapatite is precipitated on the surface of titanium dioxide powder, and nucleates and grows up. After a certain aging time, it is formed on the surface of titanium dioxide. Composite powder coated with hydroxyapatite. Compared with the existing preparation technology, this method is conducive to the uniform mixing of hydroxyapatite and titanium dioxide to form a coating structure, which increases the contact probability between the degraded product and titanium dioxide, thereby improving the photocatalytic degradation efficiency of the composite powder. In addition, the method has wide sources of raw materials, low cost, and flexible and easy-to-control process, so it has broad application prospects in environmental protection fields such as sewage treatment and air cleaning.

Description

technical field [0001] The invention relates to the technical field of photocatalyst preparation, in particular to a method for preparing a titanium dioxide / hydroxyapatite composite photocatalyst capable of degrading organic pollutants. Background technique [0002] The water resources on the earth are very precious, but they are subject to various pollutions, such as industrial wastewater and domestic wastewater, which contain a large amount of organic and inorganic pollutants. If these sewage are directly discharged into natural water sources, they will cause greater harm. Pollution, for example, many diseases are spread by microorganisms such as bacteria in the water. Therefore, sewage treatment has always attracted people's attention. [0003] The traditional sewage treatment method is to add chlorine to water, however, the reaction of chlorine with organic matter in water will produce many carcinogenic by-products including trihalomethanes and haloacetic acids. In add...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/18B01J20/06
Inventor 刘玉鑫袁建辉黄晶刘奕丁思月李华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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