Development Of TiO₂/WO₃/GO Visible Light Photocatalyst And Its Molecular Toxicity

Photocatalytic technology is widely used to deal with pollutants.Which was low cost,environment friendly,simple operation,etc.TiO₂ has good catalytic activity under uv excitation and was widely used.However,its forbidden band width is abroad?3.2 eV?,the visible light utilization rate is low and electronic-hole recombination time is high.The narrower band gap semiconductor materials?such as WO3?or good electrical conduction materials?graphene oxide?doped with Ti0O₂ is a great method,which can improve the TiO₂ visible light utilization efficiency and promote of separation of electronic-hole.At present,there are researches of graphene composite or WO3 compound with TiO₂ to improve its photocatalytic performance,but the synergistic effect of the two can not meet the needs of practical application.Therefore,it is necessary to further improve the activity of the composite catalyst.Therefore,this research was based on the peculiarity of WO3,GO and TiO₂,developed the TiO₂/WO₃/GO three composite photocatalytic material.And use the TiO₂/WO₃/GO photocatalytic degradation double phenolic compounds in aqueous solution?model is BPA?to evaluate its photocatalytic performance.On the other hand,studies have found that nano TiO₂,WO3 and GO have a certain ecological toxicity.As a new artificial nano material,the ecological risk and the harm of TiO₂/WO₃/GO emissions into the environment has not been reported.Therefore,the toxicity evaluation of TiO₂/WO₃/GO is also a problem to be studied in the future,is another important content of this paper to carry out.The research content is divided into the following areas:In the first part:TiO₂/WO₃/GO catalyst with different WO3 contents is fabricated by hydrothermal method and is characterized.In the second part:Their photocatalytic activity under UV illumination,visible light and solar light are assessed for the degradation of MO and BPA.Optimize the photocatalytic reaction conditions.Transformation by-products BPA generated during BPA degradation and photocatalytic mechanism was identified.In the third part:the toxic effect of TiO₂/WO₃/GO on CAT and SOD were investigated by UV-vis absorption,fluorescence,and circular dichroism techniques and a variety of means such as enzyme activity experiment.From the molecular level,revealed the influence of TiO₂/WO₃/GO to the structure and function of CAT and SOD,thus to some extent,to achieve the purpose of rating and toxicity to the ecological risk assessment.In this work,a novel TiO₂/WO₃/GO catalyst with different WO3 contents is fabricated by hydrothermal method,has great photocatalytic performance,and can effectively degrade BPA.On the other hand,as a new type of artificial nano material,TiO₂/WO₃/GO has a certain toxicity to antioxidant enzymes?CAT and SOD?.The practical application of this research provides a new choice and reference for visible light catalyst,and provide methodology reference and basis on the reasonable use and the ecological risk evaluation of new nano materials.