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A kind of titanium dioxide/hydroxyapatite composite photocatalytic material, preparation method and application

A technology of hydroxyapatite and composite photocatalysis, which is applied in the field of photocatalytic materials, can solve the problems of poor adsorption, high bonding strength, and easy agglomeration of titanium dioxide, and achieve good stability, high catalytic efficiency, and narrow particle size distribution.

Active Publication Date: 2019-10-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The second object of the present invention is to provide a preparation method of titanium dioxide / hydroxyapatite composite photocatalytic material, the preparation method is simple, titanium dioxide in the prepared composite photocatalytic material is uniformly dispersed and loaded on the surface of hydroxyapatite, Overcome the problem that titanium dioxide is easy to agglomerate
At the same time, the photocatalytic material prepared by this preparation method has good stability, the bonding strength between titanium dioxide and hydroxyapatite is high, and the ability of nano-hydroxyapatite adsorption and photocatalytic synergy of titanium dioxide is fully utilized to obtain better photocatalysis It overcomes the problem of poor adsorption when titanium dioxide is used as a photocatalytic material

Method used

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  • A kind of titanium dioxide/hydroxyapatite composite photocatalytic material, preparation method and application
  • A kind of titanium dioxide/hydroxyapatite composite photocatalytic material, preparation method and application
  • A kind of titanium dioxide/hydroxyapatite composite photocatalytic material, preparation method and application

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preparation example Construction

[0041] Preparation of titania sol:

[0042] Drop ammonia water into the titanyl sulfate clarified solution or titanium tetrachloride solution with a molar concentration of titanium of 1-50 mol / L to adjust the pH to above 8 to obtain a precipitate, and then wash the precipitate repeatedly until it is neutral, and then pour it into the precipitate Add hydrogen peroxide with a molar ratio of 1-4 to the titanium content and water with a volume of 1-5 times the volume of hydrogen peroxide to the product, and after clarification, heat and reflux for 1-4 hours in an oil bath at 80-110°C under strong stirring to form The sol is titanium dioxide sol.

[0043] Unless otherwise specified, the titanium dioxide sols used in the following examples are all prepared by this method.

Embodiment 1

[0045] The preparation method of titanium dioxide / hydroxyapatite composite photocatalytic material comprises the following steps:

[0046] Take 11ml of 0.5mol / L calcium nitrate aqueous solution and 11ml of 0.3mol / L ammonium hydrogen phosphate aqueous solution and add them to a 50ml polytetrafluoroethylene reaction kettle, then drop dilute nitric acid to make the pH of the solution = 2-3, and the obtained product is in the reaction kettle Stir in the middle until it becomes clear and transparent, then take 10ml of titanium dioxide sol with a concentration of 0.11mol / L and put it into the reactor and stir for about 10min, then add 2g of urea, and then put the reactor into an oven at 200°C for 10 hours , then take out the suspension obtained from the reaction and wash it with deionized water until the filtrate is neutral, then wash it three times with absolute ethanol, filter it and put it in a constant temperature drying oven for vacuum drying at 90°C, the powder is the titanium ...

Embodiment 2

[0050] The preparation method of titanium dioxide / hydroxyapatite composite photocatalytic material comprises the following steps:

[0051] Take 11ml of prepared 0.5mol / L calcium nitrate aqueous solution and 11ml of 0.3mol / L ammonium hydrogen phosphate aqueous solution and add them to a 50ml polytetrafluoroethylene reaction kettle, then drop dilute nitric acid to make the pH of the solution = 2-3, and the obtained product is in Stir in the reaction kettle until it becomes clear and transparent, then take 3.333ml of titanium dioxide sol (PTO) with a concentration of 0.11mol / L and dilute it to 10ml with secondary water, put it in the reaction kettle and stir for about 10min, then add 2g of urea, and then Put the reaction kettle into an oven at 200°C for 10 hours, then take out the suspension obtained by the reaction and wash it with deionized water until the filtrate is neutral, then wash it with absolute ethanol three times, filter it and put it in a constant temperature drying o...

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Abstract

The invention discloses a titanium dioxide / hydroxyapatite composite photocatalytic material. The structure of the composite photocatalytic material includes: titanium dioxide is coated on the surface of hydroxyapatite; the titanium dioxide is anatase type with a particle size of 5- 20nm, hydroxyapatite is in the form of flakes with a length of 0.5‑2μm. The composite photocatalytic material of the present invention has good structural stability and excellent photocatalytic degradation performance. The invention also discloses the preparation method and application of the titanium dioxide / hydroxyapatite composite photocatalytic material.

Description

technical field [0001] The invention relates to the field of photocatalytic materials. More specifically, it relates to a titanium dioxide / hydroxyapatite composite photocatalytic material, preparation method and application. Background technique [0002] Developing efficient methods to control environmental pollution is one of the major challenges faced by scientists. Whether in air or in solution, titanium dioxide photocatalyst has very high efficiency in oxidizing organic pollutants and is universal. As a photocatalyst, titanium dioxide has stable chemical properties and is non-toxic. It has been widely used in wastewater treatment, air purification, antibacterial, self-cleaning, UV protection and other fields. However, due to some defects of the material itself, such as easy agglomeration during use and poor adsorption of harmful gases and organic pollutants, the photocatalytic performance cannot reach the ideal state. Therefore, there are certain limitations in applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/18B01J35/02C02F1/30C02F101/30
CPCC02F1/30B01J27/1806C02F2305/10C02F2101/308B01J35/396B01J35/00B01J35/30B01J35/39
Inventor 只金芳塔伊尔江·图尔荪宋乐吴良专孙东峰余愿
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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