Photocatalytic Degradation Of Ozone In Aircraft Cabin Using TiO₂/Graphene Composite Material

Graphene material is received a lots reseachs and discussions by manyexperts and scholars from around the world in recent years. In this study, takeadvantage of its unique two-dimensional corbon nanostructure and excellentabsorption, electrical conductivity and other performances to prepare newphotocatalyst with TiO2nanoparticles, and to photodrgradate O3in aircraft cabin.It has a certain theoretical research value and practical application prospects.In this study, graphite oxide (GO) as the graphene precursor was preparedby Hummer method, add the tetrabutyl titanate and obtain the end productsTiO2-Gn photocatalytic composite materials by sol-gel method. The TiO2-Gncomposite with different C/Ti ratio was prepared by changing the dosage of GO.Characterized and studied the materials’ crystalline phase compositions andsurface morphology using X-ray diffraction, Raman spectroscopy, Scanningelectron microscopy, Transmission electron microscopy and so on. The resultsverified the lamellar state Gn as a carrier was adhered anatase TiO2nano-particles materials. Measured the adsorption properties and photocatalyticactivity of the composite with different C/Ti ratio utilize the azo dyes-methleneblue(MB) solution, and analysis the reaction mechanism. Selected TiO2-Gncomposite with1.5wt%of the amount of C has the highest photocatalyticactivity was the photocatalyst to do the study of photocatalytic degradation ofO3.Designed and built gas phase photocatalytic reactor, to conduct theexperiment of degradation of O3by the photocatalytic technical means. Theresults show that, the performance of preparaed TiO2-Gn composite in degrada-tion of O3was significantly better than pure TiO2. The impacts of reaction time,initial O3concentration in the photocatalytic degradation activity were investi-gated. Under the present experimental conditions, in the0.150ppm-0.200ppmO3concentration the photocatalytic degradation rate of O3is66.12%in60minby TiO2-Gn composite materials. And the photocatalytic degradation rate was77%approximately, if the initial concentration of O3was in0.950ppm-1.000ppm. Even at a lower O3concentration (in0.100ppm-0.150ppm), O3 removal rate was45.45%. In addition, the performance of materials reuse wasalso discussed, the photocatalytic degradation activity of O3could stable if thecomposite was repeated use less than4times. According to the experimentaldata and conclusions, the study speculated the reaction mechanism of theTiO2-Gn composite in photocatalytic degradation of O3.