Method for synthesizing titanium dioxide doped light catalyst from sol-gel low-temperature burn

Abstract

A process for preparing the doped TiO2 catalyst by low-temp sol-gel combustion includes such steps as providing TiCl4 as Ti source, preparing its sol, dewatering by evaporating and low-temp burning. It has high photocatalytic activity under irradiation of the light (600 nm or less in wavelength).

Description

technical field [0001] The invention belongs to the technical field of photocatalyst (photocatalyst) preparation, and in particular provides a method for synthesizing metal ion and nitrogen co-doped titanium dioxide photocatalyst by sol-gel low-temperature co-combustion, and the prepared photocatalyst can be used in industrial waste water (such as Sunlight photocatalytic treatment of industrial wastewater containing dyes, pesticides, papermaking, heavy metal ions, etc.), photodisinfection of urban domestic water, photocatalytic degradation or deodorization of indoor volatile organic gases (such as preparation of photocatalytic coatings, photocatalytic ceramics , Photocatalytic wall covering, etc.) etc. Background technique [0002] TiO 2 The bandgap energy is 3.2eV, which is equivalent to photon energy with a wavelength of 387.5nm. When TiO 2 When irradiated by ultraviolet light with a wavelength of less than 387.5nm, the electrons in the valence band transition to the co...

AI Technical Summary

Problems solved by technology

③ Photocatalytic killing of bacteria and viruses, such as the use of optical fiber conduction to kill cancer cells; some experiments have confirmed that the OH produced by titanium dioxide photocatalysis can kill SAS virus, hepatitis B virus, and even AIDS virus, and these viruses use Antimicrobials are useless

Among them, the precipitation method is simple to operate, but it is easy to introduce foreign impurities, and the particle size is not easy to control; the microemulsion method has high purity, small particle size, narrow distribution, relatively uniform shape, and good dispersion, but the yield is low and scale is difficult; The hydrothermal method has high purity, good crystallinity, narrow particle size distribution, controllable morphology, particle size, and crystal form, but high temperature and high pressure require high equipment and long crystallization time; low-temperature combustion synthesis by sol-gel method has the advantages of making doping The substance reaches the molecular level uniformity, and the combustion output is the final product, no need to wash and dry, the product has good dispersibility and high purity, etc.