Preparation method of air purification photocatalyst with extra-small precious metal loaded on titanium dioxide surface

A surface-loaded, titanium dioxide technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of noble metal nanoparticle distribution, size control, and limited scale production Application, high dispersion of P25 surface, etc., to achieve the effect of low cost, convenient operation and simple process

Inactive Publication Date: 2018-04-20
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] But so far, there is no report on the preparation and synthesis of supported semiconductor-noble metal photocatalytic materials on the surface of P25, which is highly dispersed and uniformly loaded with noble metal nanoparticles with a size ranging from 0.3 nm to 1 nm.
At the same time, the preparation of metal nanocrystals is generally carried out by photoreduction deposition method or impregnation method. These methods are difficult to effectively control the distribution and size of noble metal nanoparticles, which is not conducive to large-scale production, thus greatly limiting its scale. production application

Method used

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  • Preparation method of air purification photocatalyst with extra-small precious metal loaded on titanium dioxide surface
  • Preparation method of air purification photocatalyst with extra-small precious metal loaded on titanium dioxide surface
  • Preparation method of air purification photocatalyst with extra-small precious metal loaded on titanium dioxide surface

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preparation example Construction

[0027] The preparation method of the air-purifying photocatalyst of titanium dioxide surface loading ultra-small size noble metal of the present invention comprises the following steps:

[0028] 1) First will follow the TiO 2 The mass ratio of TiO to precious metal is 1:10-1:1000. 2 The powder is mixed with the noble metal precursor solution, the concentration of the noble metal precursor solution is 50-100mM, the noble metal contained in the noble metal precursor solution is one of Pt, Au, Ag, Pd, Ru or Ir; the noble metal precursor solution is soluble corresponding to the precious metal Salt solution, the corresponding soluble noble metal salts are respectively chloroplatinic acid, chloroauric acid, silver nitrate, chloropalladic acid, ammonium chlororuthenate or chloroiridic acid; according to the solid content (TiO 2 Mixture with precious metal) and water and ethanol 10:600:400 by adding water and ethanol to form a suspension containing 10% solids. After fully ultrasonica...

Embodiment 1

[0032] First, weigh 200g of TiO 2 into a beaker, and then add HAuCl 4 solution, the noble metal (Au) and TiO contained in the added noble metal precursor 2 The mass ratio is 1:100. According to solid content (TiO 2 Mixture with precious metal) and water and ethanol 10:600:400 by adding water and ethanol to form a suspension containing 10% solids. After fully ultrasonically dispersed, pass it into a spray dryer to keep the suspension The flow rate is 100ml / h, and the drying temperature setting range of the dryer is 120°C for rapid atomization drying to collect the powdery solid precursor. Subsequently, put the obtained solid precursor into a muffle furnace, heat up to 400°C at 5°C / min for calcination for 2 hours, and then calcine for 2 hours in a hydrogen-argon mixture containing 5% hydrogen. The calcined product is TiO 2 -Au photocatalyst material.

[0033] figure 1 for commercial TiO 2 (P25) transmission electron microscope, it can be seen that the particle size of a s...

Embodiment 2

[0035] First, weigh 200g of TiO 2 placed in a beaker, and then added H 2 IrCl 6solution, the noble metal (Ir) and TiO contained in the added noble metal precursor 2 The mass ratio is 1:500. According to solid content (TiO 2 Mixture with precious metal) and water and ethanol 10:600:400 by adding water and ethanol to form a suspension containing 10% solids. After fully ultrasonically dispersed, pass it into a spray dryer to keep the suspension The flow rate is 200ml / h, and the drying temperature setting range of the dryer is 140°C for rapid atomization drying to collect powdery solid precursors. Subsequently, put the obtained solid precursor into a muffle furnace, heat up to 400°C at 5°C / min for calcination for 2 hours, and then calcine for 2 hours in a hydrogen-argon mixture containing 5% hydrogen. The calcined product is TiO 2 -Ir photocatalyst material.

[0036] image 3 Using the transmission electron microscope image of P25 loaded with 0.2% Ir in the present inventio...

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Abstract

The invention discloses a preparation method of an air purification photocatalyst with extra-small precious metal loaded on titanium dioxide surface. The method comprises the following steps: mixing commercial TiO2 (P25, hereinafter inclusive) and a precious metal precursor solution; adding water and ethyl alcohol to the solid mixture to obtain turbid liquid with certain concentration; fully ultrasonically dispersing; quickly atomizing and drying in high temperature through an atomizing drying device in order to avoid crystallizing and growing of a metal precursor, thus obtaining a powder solid precursor; and roasting the obtained solid precursor in reducing atmosphere to obtain a TiO2-M photocatalyst material. The method is simple in preparation processes and operation, simple in technology, free from pollution, and low in cost; the obtained loading type photocatalyst is provided with P25 as the substrate; the diameter of the precious nanoparticles ranges from 0.3-1nm, and the precious nanoparticles are uniformly loaded on the surface of P25, so that high effective catalyzing activity area and outstanding air purifying capacity are ensured, and as a result, the method has a good application prospect in the air purification field.

Description

technical field [0001] The present invention relates to a kind of TiO 2 The preparation method of the air-purifying photocatalyst of ultra-small size noble metal M (M=Pt, Au, Ag, Pd, Ru, Ir) loaded on the surface, particularly relates to a kind of highly uniform dispersion on the surface of P25, loaded with extremely small particle size (between 0.3 nm-1nm) preparation method of noble nanoparticles. Background technique [0002] Indoor air pollution is one of the five major environmental factors that endanger human health. Studies have shown that there are more than 500 volatile organic compounds in indoor air, such as carcinogenic pollutants such as formaldehyde and benzene. Photocatalytic oxidation technology has become the most competitive air purification technology because of its environmental friendliness and strong degradation ability. Among them, TiO 2 (P25, the same below) material has become the most widely used photocatalyst material due to its low price, good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/46B01J23/52
CPCB01J35/004B01J23/42B01J23/44B01J23/462B01J23/468B01J23/52B01J35/006B01J35/008
Inventor 王斌刘博杨生春
Owner XI AN JIAOTONG UNIV
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