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

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...

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

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