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Hydroxyl apatite layer-wrapped photocatalytic nano titanium dioxide powder and application thereof

A technology of nano-titanium dioxide and hydroxyapatite, which is applied in coatings, radiation-absorbing coatings, chemical instruments and methods, etc., to achieve the effects of precise control process, low cost and easy mixing

Inactive Publication Date: 2014-02-05
SKSHU PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this photocatalytic powder has no difference in the degradation of small molecules such as formaldehyde and larger molecules such as methyl orange dye.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Pour 100g of titanium dioxide (P25-a highly dispersed titanium dioxide produced by AEROSIL200 process, with an average particle size of 21nm) into 200mL of water and add Na 2 CO 3 Control the pH value to 8.0, and add 5.0g of sodium dodecylsulfonate (Chinese national medicine), and fully shake to disperse.

[0044] Weigh according to the stoichiometric ratio of Ca / P=12, Ca(NO 3 ) 2 4H 2 O120g and P 2 o 5 852g were dissolved in 500mL distilled water and 500mL absolute ethanol respectively, V water: V absolute ethanol = 1: 1, oscillating and dissolving in ultrasonic waves, and then Ca(NO 3 ) 2 4H 2 The aqueous solution of O is poured into P 2 o 5 In the ethanol solution, stir and adjust the pH value to 9-10 with ammonia water, then pour the above solution into a polytetrafluoroethylene high-pressure reactor, 1 carry out hydrothermal reaction at a temperature of 200 ° C, and wash the precipitate repeatedly with deionized water , filtered with suction, d...

Embodiment 2

[0050] Example 2: By implementing the same procedures as in Example 1, the difference is that sodium hexametaphosphate (Sinopharm) is used as an anionic surfactant, and all other conditions remain the same to obtain a photocatalytic powder. The obtained photocatalytic powder is used to degrade formaldehyde or methyl orange. The measurement results show that the synthetic hydroxyapatite layer wrapped photocatalytic nano-titanium dioxide powder can completely degrade formaldehyde for 2 hours, but has no degradation effect on methyl orange and does not change color.

[0051] It is mixed and extruded with the plastic component polyethylene terephthalate resin to obtain a strip containing 30% photocatalytic powder. When it is irradiated with a 246nm ultraviolet lamp, the resin will not turn yellow or age. It is used in the water-soluble aldol resin solution (manufactured by Dow) in the coating system to make a coating system containing 30% photocatalytic powder. It is irradiated wit...

Embodiment 3

[0052] Example 3: By implementing the same procedures as in Example 1, except that 15nm titanium dioxide (provided by Fuzhou University) particles were used, and all other conditions remained the same, a photocatalytic powder was obtained. The obtained photocatalytic powder is used to degrade formaldehyde or methyl orange. The measurement results show that the synthetic hydroxyapatite layer wrapped photocatalytic nano-titanium dioxide powder can completely degrade formaldehyde for 2 hours, but has no degradation effect on methyl orange and does not change color.

[0053] It is mixed and extruded with the plastic component polyethylene terephthalate resin to obtain a strip containing 30% photocatalytic powder. When it is irradiated with a 246nm ultraviolet lamp, the resin will not turn yellow or age. It is used in the water-soluble aldol resin solution (manufactured by Dow) in the coating system to make a coating system containing 30% photocatalytic powder. It is irradiated with...

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Abstract

The invention provides photocatalytic powder capable of being applied to environment purifying and atmospheric pollutant governing. Each titanium dioxide particle is wrapped by a hydroxyl apatite layer, and holes with controllable size are formed in the hydroxyl apatite layer, so that target products such as formaldehyde and benzene are selectively degraded, and other larger molecules such as methyl orange are not damaged. The photocatalytic chemical powder can be extensively applied to various organic polymer setting products, especially organic fibers, plastic products or paint.

Description

technical field [0001] The invention relates to a photocatalytic powder applicable to environmental purification and a production method thereof. The powder can be used to remove odor, remove harmful substances or pollutants in the air, especially small molecular substances such as benzene and formaldehyde, and have a Larger dye molecules have no destructive effect; the powder is also used in drainage or water purification to remove harmful substances in water and specifically eliminate certain harmful bacteria. Through various physical means (such as kneading or embedding or mixing), the powder is especially suitable for blending into organic fibers or plastics, and the powder is more suitable for adding to coatings, especially the development and application of aldehyde-removing coatings. Background technique [0002] Indoor air pollution has become an environmental problem that is widely concerned by countries all over the world. The main indoor pollutants include sulfide...

Claims

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Application Information

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IPC IPC(8): B01J27/18C09C1/36C09C3/06A61L9/013B01D53/86B01D53/72C02F1/30C09D5/32C09D7/12C08K9/10C08K3/22
Inventor 洪杰胡必忠刘晓彬
Owner SKSHU PAINT
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