Synthesis And Characterization Of Photocatalytic Materials Based On Self-Cleaning Applications On The Surface Of Building Exteriors

The demand of living environment has been urgently rised with the development of the society and people's living standard.Many scholars are currently highly involved into the new architecture materials research to reduce pollution.Therefore,according to recent study progress,the self-cleaning function of architecture materials could be a significant method.One of the important conditions for building materials to be self-cleaning is the need to use the energy of the medium that activates the self-cleaning function of the building.Another important condition is photocatalytic technology.The new building materials combine photocatalytic technology and solar energy to achieve the purpose of building exterior cleaning.Photocatalytic technology,an emerging green technology,is a technology that uses the energy of the sunlight or the ultraviolet light to improve the environment.In this paper,some simple and mild methods are used to prepare a few of new catalysts,and the photocatalytic properties of which is characterized.This paper proposes a new way to solve the problem of external building pollution in the future.Firstly,the PAN/ZnO carbon fiber membrane was prepared by means of the electrostatic spinning and sintering methods.The zinc acetate?Zn?Ac?₂·2H₂O?was dissolved by N,N dimethylformamide?DMF?as solvent,and then the polyacrylonitrile?PAN?was added to obtain the precursor solution.The Zn?Ac?₂/PAN composite nanofibers were prepared by electrostatic spinning,with a various concentration of zinc acetate,and the effect on the morphology and properties of composite fibers is investigated.At the same time,the samples obtained by spinning are calcined at high temperatures in tube furnaces to obtain CF/ZnO fiber membranes,which was used as a catalyst.It is applied to the degradation of the methyl blue?MB?of organic pollutants.The sample has a good photocatalytic performance under visible light irradiation.The results show that the activity of the fibers increased after calcination,and the catalytic properties of ZnO were improved.Secondly,the SnO semiconductor photocatalytic material is prepared by means of the microwave hydrothermal method.The SnO micro-nanosphere photocatalytic material was synthesized by microwave hydrothermal method at different temperatures,stannous chloride and bicarbonate as raw materials.The resulting SnO was accompanied by a tiny SnO₂.By comparison,it can be found that at a temperature of 60°C,SnO microspheres were generated,the structure of which is conducive to the adsorption of pollutants.The experimental results show that SnO microspheres at 60°C have a larger specific surface area,and have the best catalytic performance.After 80 minutes of visible light irradiation,the degradation rate of methyl orange?MO?reaches 87.5%.Thirdly,by solid phase grinding combined with microwave hydrothermal assisted,with stannous chloride,bicarbonate amine and graphene oxide as raw materials,a SnO/GO composite material is obtained in which SnO was doped with graphene oxide?GO?.SnO/GO has a looser structure than the SnO nanosheet.Other properties have also been improved,and GO can accelerate the separation of photogenerated carriers,thereby increasing the catalytic speed of the photocatalyst and greatly improving the photocatalytic performance.When GO content was 5%,After 80 minutes of visible light irradiation,the degradation rate of methyl orange is98%.It is expected that Applying it to the building materials can further enhance the self-cleaning ability of the exterior of the building.Fourthly,The photocatalytic activity and hydrophilicity of SnO/graphene composites were studied after they were combined with building materials.It was found that the photocatalytic activity of SnO/graphene composites decreased after the combination of photocatalysts and building materials.When the GO content was 5%,the photocatalytic activity was the best.After 2 hours of visible light,the degradation rate of methyl orange was 89.1%.At the same time,the contact angle of ceramic wall tiles coated with photocatalysts was tested,and the results showed that has good hydrophilicity.