Preparation method of color-tunable titanium dioxide with high photocatalytic activity

Abstract

The invention discloses a preparation method of titanium dioxide with adjustable colors and efficient photocatalytic activity, belongs to the technical field of chemistry and material science, and solves the technical problems that in the prior art, the preparation method of visible-light response titanium dioxide is high in cost, complicated in steps, and poor in stability, and furthermore the prepared titanium dioxide is not adjustable in color, and low in catalytic activity. The preparation method disclosed by the invention comprises the following steps: uniformly mixing a metal hydride with titanium dioxide to obtain a mixture; under the protection of an inert gas, performing a solid-phase reaction on the mixture at 200-400 DEG C, and obtaining the titanium dioxide with adjustable colors from light gray to blue and black finally. The preparation method is simple, controllable, low in cost, and convenient for mass production; in the meantime, the prepared titanium dioxide is adjustable in colors, stable in physicochemical property and high in photocatalytic activity, and can be widely applied to the fields of self-cleaning coatings, paints, coatings, photocatalysis, solar cells and the like.

Description

technical field

[0001] The invention relates to a preparation method of titanium dioxide with adjustable color and high photocatalytic activity, belonging to the fields of chemistry and material science. Background technique

[0002] As the most widely used semiconductor material, titanium dioxide has cheap, non-toxic, stable physical and chemical properties and relatively high photocatalytic activity. It is an ideal photocatalyst, gas sensor, solar cell and pigment material. , plastics, paper, paint, cosmetics, photocatalyst, medicine and other chemical and environmental protection fields have a wide range of applications.

[0003] Titanium dioxide is usually white and is a wide bandgap semiconductor (the bandgap width of the rutile phase is 3.0eV, and the bandgap width of the anatase phase is 3.2eV). It can only use the ultraviolet part of the solar spectrum, and the photoelectric conversion efficiency is usually less than 2.2%. Therefore, how to expand the light absorpt...

Examples

preparation example Construction

[0034] The preparation method of titanium dioxide with adjustable color and high-efficiency photocatalytic activity uses various crystalline or amorphous titanium dioxide as raw materials, and uses metal hydride as a reducing agent to prepare titanium dioxide with adjustable color and high-efficiency photocatalysis by a low-temperature solid-state reaction method. The titanium dioxide of catalytic activity specifically comprises the following steps:

[0035] (1) mixing and grinding the metal hydride and titanium dioxide evenly to obtain a mixture;

[0036] (2) Under an inert atmosphere, heat the mixture at 200-400°C for 5min-10h. As the reaction temperature increases or the reaction time prolongs, the color of titanium dioxide gradually changes from white to light yellow, light gray, light blue, Blue, dark blue to black, according to the color of the preparation, stop the reaction in time, cool in an inert atmosphere, and get the crude product;

[0037] If the reaction temper...

Embodiment 1

[0044] combine figure 1 , 6 -11 illustrates embodiment 1

[0045] (1) Grinding 1.9g sodium borohydride and 4.0g photocatalyst P25 (metal hydride: P25=1:1) in a mortar to obtain a mixture;

[0046] (2) Put the mixture into a porcelain boat, heat it to 300°C or 350°C at a heating rate of 10°C / min in an atmosphere furnace filled with argon, keep it for 5-120min, and naturally cool to room temperature to obtain the crude product ;

[0047] (3) The crude product obtained after the reaction was washed three times with water and ethanol respectively, and dried in vacuum at 70° C. to obtain titanium dioxide powder, as marked in Table 1.

[0048] figure 1 Among them, (a) is the UV-visible solid diffuse reflectance spectrum of different titanium dioxide powders prepared in Example 1 of the present invention, figure 1 In (a), the curves from top to bottom are CIOMP-8, CIOMP-7, CIOMP-6, CIOMP-5, CIOMP-4, CIOMP-3, CIOMP-2, CIOMP-1 and P25 UV-visible solids Diffuse reflectance spectru...

Embodiment 2

[0059] (1) Grinding 0.38g sodium borohydride and 4.0g photocatalyst P25 (metal hydride: P25=0.2:1) in a mortar evenly to obtain a mixture;

[0060] (2) Put the mixture into a porcelain boat, heat it to 400°C at a heating rate of 10°C / min in an atmosphere furnace filled with argon, keep it for 120min, and naturally cool to room temperature to obtain a crude product;

[0061] (3) The crude product obtained after the reaction was washed three times with water and ethanol respectively, and dried in vacuum at 70° C. to obtain black titanium dioxide powder.

technical field

[0001] The invention relates to a preparation method of titanium dioxide with adjustable color and high photocatalytic activity, belonging to the fields of chemistry and material science. Background technique

[0002] As the most widely used semiconductor material, titanium dioxide has cheap, non-toxic, stable physical and chemical properties and relatively high photocatalytic activity. It is an ideal photocatalyst, gas sensor, solar cell and pigment material. , plastics, paper, paint, cosmetics, photocatalyst, medicine and other chemical and environmental protection fields have a wide range of applications.

[0003] Titanium dioxide is usually white and is a wide bandgap semiconductor (the bandgap width of the rutile phase is 3.0eV, and the bandgap width of the anatase phase is 3.2eV). It can only use the ultraviolet part of the solar spectrum, and the photoelectric conversion efficiency is usually less than 2.2%. Therefore, how to expand the light absorpt...

Examples

preparation example Construction

[0034] The preparation method of titanium dioxide with adjustable color and high-efficiency photocatalytic activity uses various crystalline or amorphous titanium dioxide as raw materials, and uses metal hydride as a reducing agent to prepare titanium dioxide with adjustable color and high-efficiency photocatalysis by a low-temperature solid-state reaction method. The titanium dioxide of catalytic activity specifically comprises the following steps:

[0035] (1) mixing and grinding the metal hydride and titanium dioxide evenly to obtain a mixture;

[0036] (2) Under an inert atmosphere, heat the mixture at 200-400°C for 5min-10h. As the reaction temperature increases or the reaction time prolongs, the color of titanium dioxide gradually changes from white to light yellow, light gray, light blue, Blue, dark blue to black, according to the color of the preparation, stop the reaction in time, cool in an inert atmosphere, and get the crude product;

[0037] If the reaction temper...

Embodiment 1

[0044] combine figure 1 , 6 -11 illustrates embodiment 1

[0045] (1) Grinding 1.9g sodium borohydride and 4.0g photocatalyst P25 (metal hydride: P25=1:1) in a mortar to obtain a mixture;

[0046] (2) Put the mixture into a porcelain boat, heat it to 300°C or 350°C at a heating rate of 10°C / min in an atmosphere furnace filled with argon, keep it for 5-120min, and naturally cool to room temperature to obtain the crude product ;

[0047] (3) The crude product obtained after the reaction was washed three times with water and ethanol respectively, and dried in vacuum at 70° C. to obtain titanium dioxide powder, as marked in Table 1.

[0048] figure 1 Among them, (a) is the UV-visible solid diffuse reflectance spectrum of different titanium dioxide powders prepared in Example 1 of the present invention, figure 1 In (a), the curves from top to bottom are CIOMP-8, CIOMP-7, CIOMP-6, CIOMP-5, CIOMP-4, CIOMP-3, CIOMP-2, CIOMP-1 and P25 UV-visible solids Diffuse reflectance spectru...

Embodiment 2

[0059] (1) Grinding 0.38g sodium borohydride and 4.0g photocatalyst P25 (metal hydride: P25=0.2:1) in a mortar evenly to obtain a mixture;

[0060] (2) Put the mixture into a porcelain boat, heat it to 400°C at a heating rate of 10°C / min in an atmosphere furnace filled with argon, keep it for 120min, and naturally cool to room temperature to obtain a crude product;

[0061] (3) The crude product obtained after the reaction was washed three times with water and ethanol respectively, and dried in vacuum at 70° C. to obtain black titanium dioxide powder.

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