Preparation method of nano titanic oxide film for photochemical catalyst

Abstract

The invention discloses a preparation method used for a photocatalytic nano-TiO2 film; firstly, butyl titanate is taken as TiO2 former body; ethanol is taken as solvent; ethylene glycol used as inhibitor and polyethylene glycol used as pore-forming agent are added and mixed under room temperature at low speed; subsequently, secondary distilled water and ethanol with a certain proportion are addedand uniformly mixed to gain glue A; secondly, titanium tetra-isopropoxide or tetrabutyl titanate is used as main raw material and mixed with isopropyl alcohol and dripped into compounded dilute nitric acid solution so as to gain glue B; glue A and glue B are uniformly mixed and anhydrous alcohol is added to be alcoholysed as TiO2 colloid; meanwhile, stainless steel wire net is pre-disposed by acid-washing and the like and working procedures such as glue-sticking and the like are carried out so as to gain the product. The preparation method has the advantages that the reaction efficiency of the catalyst and the utilization ratio of the light energy can be effectively improved, the film and the carrier form firm combination and keep best crystal form proportion.

Description

technical field The invention belongs to the field of preparation of titanium dioxide thin films, and relates to a preparation method of nano titanium dioxide thin films for photocatalysis. Background technique At present, the most studied and most promising solution to the purification of indoor air pollution is the nano-titanium dioxide technology for photocatalysis. It is characterized by being non-toxic to the human body, harmless to the environment, and can efficiently purify chemical pollution and biological pollution. It can kill bacteria and germs while decomposing organic matter and degrading toxic gases. At present, in the preparation method of photocatalytic nano-titanium dioxide film, the basic steps mainly adopt the sol-gel method to form the film, that is, the titanium dioxide precursor is hydrolyzed to obtain a titanium dioxide ultrafine colloidal solution, and then the brushing method and the pulling method are used to prepare the film. The titanium dioxide ...

AI Technical Summary

Problems solved by technology

At present, in the preparation method of photocatalytic nano-titanium dioxide film, the basic steps mainly adopt the sol-gel method to form the film, that is, the titanium dioxide precursor is hydrolyzed to obtain a titanium dioxide ultrafine colloidal solution, and then the brushing method and the pulling method are used to prepare the film. Transfer the titanium dioxide ultrafine particle sol to the metal mesh, and prepare nano-titanium dioxide film after drying and sintering. The bonding strength between this film and the carrier is poor, and the film is easy to fall off.

At the same time, it is also a technical defect that the sol cannot be stored for a long time in the traditional method.