Study Of Efficient Photocatalytic Reduction Of CO₂ On Self-doped TiO₂ Materials

After the Industrial Revolution,people have to confront with the energy crisis and environmental pollution.Developing a kind of technology that approach to transfer the CO2 and H2O to hydrocarbon compounds by solar energy can be a good way to resolve both of the two problems.This subject has important meaning in theory and practice.Photocatalysis is regarded as a promising approach to achieve it.TiO2 is a kind of semiconductor photocatalytic material with the advantages of environmentally friendly,cheap,nontoxic and abundant,which makes it become an attractive material with key status in this field.Our article mainly focuses on the growth of TiO2 crystal on the Ti foil,getting different crystal styles of TiO2 film.By cold plasma reduction method,we introduce the intrinsic defects into the film that is exposed with high-reactive facets.Ag nanoparticles were deposited on the surface of TiO2 nanorods arrys by chemical percipition and cold plasma and the surface intrinsic defects were introduced by ethanol thermal treatment.In this article,SEM,TEM,EDS,XRD,XPS,EPR,Raman and UV-vis are used to characterize materials and research the photocatalytic performance by CO2 photoreduction in the homemade apparatus.1).The Ti foil that is treated by HCl is as the substrate to grow the double layer structure of rutile TiO2 film.And Ag nanoparticles were deposited on the TiO2 film with intrinsic defects on the surface by chemical percipition,cold plasma and ethanol thermal treatment.The diameter of the Ag nanoparticle is below 20nm with good morphology,uniform size and good dispersity.Ag-TiO2 self-doped nanocomposite material has better photocatalytic performance compared with pristine TiO2.The yield of CO and CH4 reach 150?mol/g and 11.7?mol/g respectively under the simulated solar light.2).Ti foil treated by the H2O2 as a substrate is used to grow a TiO2 film that is exposed with high-reactive anatase facets.The film is exposed with(001)and(111)facets,which can promote its photocatalytic performance.3).We introduce the intrinsic defects into the anatase TiO2 film that is exposed with high-reactive facets by cold plasma under the atmospheric environment.And it has better photocatalytic performance compared with the pristine TiO2 under the simulated solar light.And the yield of CO and CH4 can reach 75?mol/m2 and 15?mol/m2 respectively.