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Visible light catalytic modified titanium dioxide and preparation method and application thereof

A titanium dioxide and visible light technology, applied in the field of tooth whitening, can solve the problems of shortening the storage time of whitening gel, low oxidation efficiency of whitening gel, and accelerating the decomposition of hydrogen peroxide, so as to achieve less eye and skin irritation, safe use, and reduced decomposition. Effect

Pending Publication Date: 2021-10-15
INST OF OCEANOLOGY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the oxidation efficiency of whitening gel is not high, and it is necessary to prolong the light time to achieve a good whitening effect; secondly, using high-energy blue light as the excitation light source may cause dizziness, dazzling, and even increase the chance of eye diseases; at the same time, whitening Gels generally have a short storage period. During storage and production, visible light will accelerate the decomposition of hydrogen peroxide and shorten the storage time of whitening gels.

Method used

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  • Visible light catalytic modified titanium dioxide and preparation method and application thereof
  • Visible light catalytic modified titanium dioxide and preparation method and application thereof
  • Visible light catalytic modified titanium dioxide and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 A kind of luminescent tooth whitening gel, preparation method and application

[0036] ① Preparation of nano-modified titanium dioxide and light absorber

[0037] Take 9mL of butyl titanate and slowly add it dropwise to the mixture of 200mL of absolute ethanol and 5g of bismuth nitrate. After dropping, put it into a water bath at 85°C and stir mechanically for 6 hours to evaporate the solvent, then dry it in vacuum at 80°C. After grinding, put it into a covered crucible and burn it at 600°C for 2h to obtain Bi-modified nano-titanium dioxide powder (the XPS diagram is shown in figure 1 , electron transmission electron microscope TEM photo see figure 2 ).

[0038] Depend on figure 1 It can be seen that Bi element has been successfully doped into nano-TiO2 by sol-gel method. Bi can reduce the bandgap width of titanium dioxide and improve the visible light catalytic activity of titanium dioxide. figure 2 It is a TEM photo of Bi-modified nano-titanium dio...

Embodiment 2

[0050] The teeth whitening gel in Example 1, the preparation method and application are basically the same as in Example 1, the only difference is that the calcination temperature is 500°C when preparing the modified nano titanium dioxide powder, and the visible light tooth whitening gel obtained by the above preparation is used in LED Visible light irradiation, detect the change of hydrogen peroxide and OH, the change results are shown in image 3 with Figure 4 . Simultaneously, the application process of embodiment 2 is the same as that of embodiment 1, and the trial results are shown in Table 1.

[0051] Depend on image 3 with Figure 4 It can be seen that during the preparation of nano-modified titanium dioxide, the calcination temperature is different, and the concentration of hydrogen peroxide and ·OH detected during the irradiation of the whitening gel is different. Among them, when the calcination temperature is 600°C, the concentration of hydrogen peroxide and ·...

Embodiment 3

[0053] The tooth whitening gel of Example 1, the preparation method and application are basically the same as in Example 1, the only difference is that in the preparation process of the whitening gel, the addition amount of triethanolamine is 0.5kg, and the application process of Example 3 is the same as that of Example 1. The same, the trial results are shown in Table 1.

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Abstract

The invention relates to a tooth whitening technology, in particular to visible light catalytic modified titanium dioxide and a preparation method and application thereof. Butyl titanate and bismuth nitrate are subjected to a sol-gel reaction in a low-boiling-point organic solvent, and then high-temperature calcination is performed to obtain the bismuth-doped titanium dioxide with the spherical structure. The nano modified titanium dioxide is applied to tooth whitening gel. According to the tooth whitening gel, the photocatalytic activity of the nano-modified titanium dioxide is utilized, electron holes with strong oxidizing property are generated by assisting visible light illumination, and the electron holes can also synergistically catalyze and decompose hydrogen peroxide to generate hydroxyl radicals (. OH), so that the catalytic activity of the hydrogen peroxide is improved, and the whitening effect on teeth can be remarkably improved through electron holes and .OH.

Description

technical field [0001] The invention relates to teeth whitening technology, in particular to a visible light catalyzed modified titanium dioxide and its preparation method and application. Background technique [0002] Whitening gel is a tooth whitening technology popular in Europe and the United States. It uses high-intensity blue light with a wavelength in the range of 480-520nm to irradiate hydrogen peroxide gel to decompose hydrogen peroxide to produce oxidative species with strong oxidative activity, such as hydroxyl radicals ( OH), the oxidation potential of OH is as high as 2.8V, which can oxidize the yellow pigment and melanin deposited on the teeth to achieve whitening effect. Although the whitening gel technology is relatively mature, there are still some problems in the cold light teeth whitening products currently on the market. First of all, the oxidation efficiency of whitening gel is not high, and it is necessary to prolong the light time to achieve a good wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J21/06A61K8/04A61K8/22A61K8/29A61K8/34A61K8/37A61K8/46A61Q11/00
CPCB01J23/18B01J21/063A61K8/29A61K8/22A61K8/042A61K8/347A61K8/46A61K8/375A61Q11/00A61K2800/81A61K2800/413B01J35/39
Inventor 赵霞刘栓熊师源黄晓乐陈志宇
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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