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Method for preparing titanium dioxide-supported noble metal visible light material

A photocatalytic material, titanium dioxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as difficult to control the uniform distribution of noble metal nanoparticles, and achieve The effect of highly efficient selective photooxidation reaction

Inactive Publication Date: 2013-01-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods of supporting noble metals mainly include impregnation method, photodeposition method, sol-gel method, etc., but it is difficult to control the uniform distribution of noble metal nanoparticles on the surface of the carrier.

Method used

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  • Method for preparing titanium dioxide-supported noble metal visible light material
  • Method for preparing titanium dioxide-supported noble metal visible light material
  • Method for preparing titanium dioxide-supported noble metal visible light material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this example, titanium dioxide microspheres were selected as the carrier. Mix tetrabutyl titanate and ethanol uniformly at a volume ratio of 1:4, and add 40% hydrofluoric acid solution: wherein the volume ratio of tetrabutyl titanate and hydrofluoric acid solution is 25:3. Put the mixed solution into an autoclave lined with polytetrafluoroethylene, and react at 180°C for 2 hours. After natural cooling, the product is washed, filtered, and dried to obtain anatase phase titanium dioxide with a diameter of 3-6 μm. Microspheres.

[0022] Add 1g of titanium dioxide microspheres into 50mL of absolute ethanol to form a suspension, feed nitrogen, and irradiate with ultraviolet light for 3min under anaerobic conditions, and then inject 1wt% of chloroauric acid into the suspension in the dark. 3+ Under the reduction of the metal ions, the metal ions are converted into elemental metal nanoparticles and deposited on the surface of titanium dioxide, thus forming AuTiO 2 Visible...

Embodiment 2

[0025] In this example, titanium dioxide microspheres were selected as the carrier. Mix tetrabutyl titanate and ethanol uniformly at a volume ratio of 1:5, and add 40% hydrofluoric acid solution: wherein the volume ratio of tetrabutyl titanate to hydrofluoric acid solution is 25:3. Put the mixed solution into an autoclave lined with polytetrafluoroethylene, and react at 160°C for 2 hours. After natural cooling, the product is washed, filtered, and dried to obtain anatase phase titanium dioxide with a diameter of 3-5 μm. Microspheres.

[0026] Add 0.5g of titanium dioxide microspheres into 50mL to form a suspension, feed nitrogen, and irradiate with ultraviolet light for 10min under anaerobic conditions, then inject a certain amount of (1wt%) chloroplatinic acid into the suspension in the dark. Ti 3+ Under the reduction of the metal ions, the metal ions are converted into elemental metal nanoparticles and deposited on the surface of titanium dioxide, thus forming PtTiO 2 Vis...

Embodiment 3

[0028] In this example, titanium dioxide microspheres were selected as the carrier. Mix tetrabutyl titanate and ethanol uniformly at a volume ratio of 1:4, and add 40% hydrofluoric acid solution: wherein the volume ratio of tetrabutyl titanate and hydrofluoric acid solution is 25:3. Put the mixed solution into an autoclave lined with polytetrafluoroethylene, and react at 170°C for 2 hours. After natural cooling, the product is washed, filtered, and dried to obtain anatase phase titanium dioxide with a diameter of 3-6 μm. Microspheres.

[0029] Add 0.5g of titanium dioxide microspheres to 50mL of absolute ethanol to form a suspension, feed nitrogen, and irradiate with ultraviolet light for 5min under anaerobic conditions, then inject a certain amount (1wt%) of silver nitrate into the suspension in the dark , at Ti 3+ Under the reduction of the metal ions, the metal ions are converted into elemental metal nanoparticles and deposited on the surface of titanium dioxide, thus for...

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Abstract

The invention discloses a method for preparing a titanium dioxide-supported noble metal visible light photocatalytic material, which comprises: adding titanium dioxide microspheres or titanium dioxide nano sheets into absolute ethanol to obtain suspension; introducing nitrogen, irradiating with ultraviolet light for 1 to 20 minutes in the absence of oxygen; injecting a certain amount of a noble metal precursor into the suspension in dark when the white titanium dioxide turns light blue first and then dark blue, so that metal ions are converted into monomer metal nano particles under the reducing action of Ti<3+> and the monomer metal nano particles are deposited on the surface of the titanium dioxide; and thus, obtaining the titanium dioxide-supported noble metal visible light photocatalytic material. The electrons generated by the noble metal nano particles supported by the preparation method under the excitation of visible light can be transferred to the titanium dioxide serving as a carrier effectively, so that selective photooxidation reaction can be performed with high efficiency.

Description

technical field [0001] The invention relates to a preparation method of a photocatalytic material, which can be used in the environmental protection technical field of selective photooxidation. Background technique [0002] In recent years, environmental and energy issues have become an important challenge that threatens human existence, and the rapidly developed semiconductor photocatalytic oxidation technology has become an effective method to address environmental and energy issues. Among many semiconductor photocatalytic materials, nano-TiO 2 With its outstanding advantages such as high stability, high activity, low price, non-toxic and non-polluting, it has been widely studied in the field of photocatalysis. However, the energy band gap of titanium dioxide is about 3.2eV, and it can only use ultraviolet light in sunlight; but the energy of ultraviolet light only accounts for 4% of solar energy, while visible light accounts for 43%, so in practical applications, the lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J23/42B01J23/50
Inventor 秦晓燕郑兆科黄柏标张晓阳
Owner SHANDONG UNIV
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