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Nano titanic oxide photocatalyst responding to visible light and preparation method thereof

A nano-titanium dioxide and photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low utilization rate of light energy, large wavelength range of visible light, etc. problems, to achieve the effect of reducing processing costs, convenient recycling, and simple process

Inactive Publication Date: 2009-08-05
HUNAN CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The average diameter of photocatalyst particles prepared by this method is 5nm, and has a certain absorption rate for visible light with a wavelength of 500-600nm, especially for light with a wavelength of about 560nm, and forms an absorption in this wavelength range. However, due to the large wavelength range of visible light, the catalyst prepared by this method can only use a small part of it, so the utilization rate of light energy is very low

Method used

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  • Nano titanic oxide photocatalyst responding to visible light and preparation method thereof
  • Nano titanic oxide photocatalyst responding to visible light and preparation method thereof
  • Nano titanic oxide photocatalyst responding to visible light and preparation method thereof

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Embodiment 1

[0031] A nano-titanium dioxide photocatalyst that responds to visible light, which is loaded with nano-TiO on the surface of activated carbon 2 particles, and metal-doped anatase TiO 2 photocatalyst, in which nano-TiO 2 The mass ratio to activated carbon is 1:5-15 (1:10 in this embodiment), metal silver and nano TiO 2 The mass ratio is 0.5-2:100 (0.5:100 in this embodiment), metal copper or iron or rhodium or platinum or gold or tin and nano TiO 2 The mass ratio is 0-2:100 (0:100 in this embodiment).

[0032] The preparation method of the nano-titanium dioxide photocatalyst responding to visible light as above, it comprises the following steps:

[0033] (1) Prepare titanate solution, take titanate and solvent alcohol in a mass ratio of 1-2:1, mix and stir evenly; titanate described in the present invention is butyl titanate, ethyl titanate, titanic acid Isopropyl ester, tetra-n-butyl titanate, described solvent alcohol is ethanol, propanol, butanol, isobutanol, diethanolam...

Embodiment 2

[0043] In step (3), prepare soluble metal copper or iron or rhodium or platinum or gold or tin salt solution, press metal copper or iron or rhodium or platinum or gold or tin and nanometer TiO 2 Get soluble metal copper or iron or rhodium or platinum or gold or tin salt, mix by 1:50-200 (mass ratio) with solvent alcohol and distilled water, stir (this embodiment is to get 1.2g copper nitrate, no Water ethanol and distilled water 30ml, mix and fully stir to form copper nitrate ethanol solution).

[0044] In step (5), make TiO 2 Particles, silver ions, and copper ions are uniformly loaded on the surface of activated carbon.

[0045] The rest are the same as embodiment 1. Anatase-type TiO made of metal-doped silver 0.5%, copper 1%, activated carbon supported 2 catalyst of light.

Embodiment 3

[0047] In (2) in the step, get the silver nitrate of 1.5g, all the same with embodiment 2. Made of metal-doped silver 1.5%, copper 1%, activated carbon supported anatase TiO 2 catalyst of light.

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Abstract

The invention discloses a nanometer titanium dioxide photocatalyst responding visible light with high absorbance and a wide wavelength range on the visible light. The photocatalyst is characterized in that a mass ratio of nanometer TiO2 to active carbon is 1:5-15; a mass ratio of metal silver to the nanometer TiO2 is 0.5-2:100; and a mass ratio of metal copper or iron or rhodium or platinum or gold or tin to the nanometer TiO2 is 0-2:100. The method for preparing the photocatalyst comprises the following steps: preparing a titanium ester solution and a soluble metal salt solution to be mixed and evenly stirred; evenly loading TiO2 particles and metal ions onto the surface of the active carbon by a sol-gel method; and carrying out thermal treatment under the protection of inert gases at a temperature of between 300 and 600 DEG C for 2 to 6 hours so as to prepare the metal doped and active carbon loaded anatase type TiO2 photocatalyst. The photocatalyst and the method have a simple process; compared with the prior loading type visible light photocatalyst, the prepared product can sufficiently utilize sunlight, has the absorbance to the visible light reaching about 85 percent and wide wavelength range, can be industrially applied, has the characteristics of energy conservation, environmental protection and the like; meanwhile, due to larger particles of the active carbon, recycle of the photocatalyst is convenient, and treatment cost is reduced.

Description

Technical field: [0001] The invention relates to a photocatalyst and a preparation method thereof, in particular to a nano titanium dioxide photocatalyst responding to visible light and a preparation method thereof. Background technique: [0002] Semiconductor heterogeneous photocatalysis is a new research field developed in the past 40 years. The principle is that semiconductor materials undergo charge separation under the action of light to form electron-hole pairs, thereby accelerating the redox reaction rate. The photocatalytic oxidation reaction has the following advantages: first, low-temperature deep reaction, second, thorough purification, third, green energy, and fourth, long life. [0003] TiO 2 Photocatalyst is the most widely studied and most active photocatalyst. It has the characteristics of good stability, non-toxicity, low cost, and corrosion resistance. difficulty. Since ultraviolet light only accounts for 4-6% of sunlight, and it is greatly changed by ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/89
Inventor 廖建勇廖玲芝
Owner HUNAN CITY UNIV
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