Preparation?Characterization And Photocatalytic Properties Of Ag/AgBr/GO Composites

Disposal of waste water and waste gas in industrial production is the main reason for the environmental pollution.With the improvement of the national economy,people's lives have been greatly improved,and people do not want to pursue economic benefits blindly,hope that the environment pollution can be decreased which was caused by the rapid industrial development process.At present,researchers are looking for a efficient way to solve the present environmental problems and would not cause new environmental pollution.Photocatalytic technology is a kind of advanced oxidation technology which can produce redox capacity under UV or visible light irradiation,so it has a wide application prospect in environmental governance.In this paper,we mainly focused on the GO-AgBr nanocomposites,and then composited with TiO₂ and WO₃ semiconductor,respectively.XRD,TEM,SEM,UV-Vis and IR analysis were used to characterize the structure,morphology as well as the photocatalytic performance of the relationship between the structure and performance.The relationship between structures and properties was also discussed.The mainly contents of this paper include:1)Firstly,the graphite oxide was synthesized by the classical Hummers' method,and the graphene oxide was obtained by ultrasonic method.The Ag/AgBr/GO photocatalyst was obtained by adding the aqueous solution of AgNO₃ and the chloroform solution of hexadecylammonium bromide?CTAB?under ultrasonic.The structures and morphologies of the photocatalysts were analyzed by XRD,TEM,IR and UV-DRS.It was found that AgBr could be supported on the surface of graphene oxide uniformly,and Ag particles dispersed around on the surface of AgBr.The methyl orange was used as the target pollutant to test the photoactivity of the photocatalyst under visible light irradiation.The experiment result showed that the sample had strong photocatalytic activity and was able to degrade about 90% of methyl orange contaminants in 100 min.In addition,the photocatalytic activity of photocatalyst was also studied with 4-chlorophenol as the target pollutant,and found that the sample had no strong photocatalytic activity.In order to effectively degrade 4-cp,the following research methods are proposed.2)Ag/AgBr/TiO₂/GO composite photocatalyst was prepared by introducing TiO₂ to the Ag/AgBr/GO nanocomposites.The catalysts were characterized by XRD,TEM,SEM and UV-DRS.The photocatalytic performance of Ag/AgBr/TiO₂/GO was evaluated by 4-cp as the target pollutant.The experiment results showed that Ag/AgBr/TiO₂/GO had strong photocatalytic activity for 4-cp.The degradation effect was compared under visible light with/without the cut-off filter.It was found that the photocatalytic effect was better under the condition of no cut-off filter.Through analysis of the degradation process of pollutants,the hypothesis of the degradation of 4-chlorophenol was put forward.And the possible photocatalytic degradation mechanism was also discussed according to the experimental results.3)A new composite photocatalyst AgBr/WO₃/GO was fabricated under the hydrothermal condition.Aimed at the photocatalytic performance of the composites cound be further improved.The structure and morphology of AgBr/WO₃/GO catalyst were characterized by TEM,SEM,XRD,IR and UV-DRS.The photocatalytic activity of WO₃ was investigated by using the methyl orange as the target pollutant under visible light.It was found that the photocatalytic activity of WO₃/GO photocatalyst supported by GO and the AgBr/WO₃/GO photocatalyst with further loading of AgBr was better than that WO₃ alone,indicating that the presence of GO and AgBr could enhance the photocatalytic activity of WO₃.