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Preparation method of noble metal modified titanium dioxide photocatalyst

A technology of titanium dioxide and photocatalyst, which is applied in the field of preparation of photocatalyst and can solve the problems of limiting the application of titanium dioxide and the like

Inactive Publication Date: 2009-02-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This greatly limits the application of titanium dioxide

Method used

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  • Preparation method of noble metal modified titanium dioxide photocatalyst
  • Preparation method of noble metal modified titanium dioxide photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Prepare 800ml of a mixed solution containing silver nitrate 0.02g / L and phenol 0.02g / L, adjust the pH value to 4 with NaOH solution and nitric acid solution, and then mix with 0.6g anatase TiO 2 Mix (the particle size is about 300 nanometers), fully shake in the ultrasonic machine for 30 minutes, pour it into the photocatalytic reactor, and turn on the 20W ultraviolet lamp at 25°C to carry out the photocatalytic reaction for 2 hours, filter and separate the catalyst, and wash with distilled water for 3 Once, dry in an oven at 100°C for 6h to obtain a supported Ag / TiO with a silver content of 1.0wt%. 2 Catalyst, denoted as T1.

Embodiment 2

[0024] Prepare 800ml of a mixed solution containing silver nitrate 0.02g / L and acetic acid 0.005g / L, adjust the pH value to 2 with NaOH solution and acetic acid solution, and then mix with 0.4g mixed crystal TiO 2 (the particle size is about 500 nanometers) mixed, and fully shaken in the ultrasonic machine for 60 minutes, poured into the photocatalytic reactor, at 30 ° C, turn on the 20W ultraviolet lamp to carry out the photocatalytic reaction for 4 hours, filter and separate the catalyst, wash with distilled water for 3 Once, dry at 80°C for 10h in an oven to obtain a supported Ag / TiO with a silver content of 1.35wt%. 2 Catalyst, denoted as T2.

Embodiment 3

[0026] Prepare 800ml of mixed solution whose silver nitrate concentration is 1g / L and ethanol concentration is 0.5g / L, adjust the pH value to 8 with ammonia solution and nitric acid solution, and then mix with 2g anatase TiO 2 (The particle size is about 100 nanometers) mixed, and fully shaken in the ultrasonic machine for 10 minutes, poured into the photocatalytic reactor, at 20 °C, turn on the 125W UV lamp to carry out the photocatalytic reaction for 2 hours, filter and separate the catalyst, distilled water Washed 3 times and dried in an oven at 100°C for 2h to obtain a supported Ag / TiO with a silver content of 1.54wt%. 2 Catalyst, denoted as T3.

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Abstract

The invention relates to a preparation method of a noble metal modified titanium dioxide photocatalyst, which refers to a photo-catalytic oxidation-reduction coupling method realized in a photo-catalytic reactor: firstly, TiO2, noble-metal water soluble salt and organism are used for preparing a suspension which is then ultrasonically vibrated after the pH value is regulated to 1-12, put into a photo-catalytic reactor for reaction for 0.5h to 8h at 0 DEG C to 90 DEG C under the irradiation of an ultraviolet source with the power of 8W to 125W or a medium or high-voltage mercury lamp source with the power of 100W to 600W, and then separated, washed and dried to obtain the TiO2 photocatalyst modified by noble metal Ag, or Au, or Pt or Pd, wherein, the content of TiO2 is 90 percent to 99.99 percent, the content of the noble metal is 0.01 percent to 10 percent. The noble metal modified titanium dioxide photocatalyst has high photocatalytic degradation activity and strong surface hydrophobicity and the attached catabolites are easy to clean.

Description

1. Technical field [0001] The invention relates to a method for preparing a photocatalyst, in particular to preparing a noble metal-modified titanium dioxide photocatalyst through a coupling process in which a photocatalytic oxidation reaction and a photocatalytic reduction reaction are carried out simultaneously in a photocatalytic system of a reactor. 2. Background technology [0002] Titanium dioxide has photocatalytic activity, which can decompose dirt, organic matter in pollutants, bacteria, etc. into CO 2 、H 2 O or H 2 and other harmless substances released into the air. It has high photocatalytic activity, good stability, no pollution and low price, and has very broad application prospects in the field of photocatalysis. However, titanium dioxide has a wide band gap (3.2eV), and only ultraviolet light with a wavelength of less than 387nm can excite titanium dioxide to generate photogenerated electrons and holes, and then react. This greatly limits the application ...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J21/06
Inventor 崔鹏王琪蔡微莉
Owner HEFEI UNIV OF TECH
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