Synthesis And Photodegradation For Organic Solutions Of BiFeO₃/Ag/AgCl Composited Materials

Enter the twenty-first century,energy shortage and environmental degradation have become the two focus of attention and major challenges that the sustainable development faces.Photocatalytic technology is an advanced technology that could be capable of using solar energy to produce hydrogen energy.Solar energy offer many advantages over other energy systems.It is environmental-friendly,regenerative and cost-efficient.Photocatalytic technology can spit the water into hydrogen and degrade the pollutants.It obtain a great advantage over the traditional method for the degradation of pollutants.Therefore it is predicted that the prospects for the development of photocatalysts would be vast.Bismuth ferrite(BiFeO3)photocatalyst is newly discovered in recent years.It possesses unique optical properties and hierarchical structures and it has strong absorption in visible-light region.But the speedy recombination of photo-excited electrons and holes of Bismuth ferrite has had an impact on practical applications,so the modification of Bismuth ferrite is meaningful.In this paper,the modifications of BiFeO3 were carried out by loading Ag/AgCl nanoparticles,and Ag/AgCl/BiFeO3 photocatalysts were synthesized.The prepared materials were characterized by XRD,SEM,TEM,HRTEM,UV-vis DRS,TOC and PL,respectively.Using methyl orange,rhodamine B and mehyl blue as the target pollutants and analyzing thecrystalline structure and morphology of the samples and the possible mechanism of the photocatalytic reaction system.The details are as follows:The first introduced the technologies used in organic pollutants,the mechanisms and applications of photocatalytic technology,and analyzed the existing problems in research and the modification methods of photocatalyst.Then the characteristics,synthetic method and current research situation of BiFeO3 materials and Ag/AgCl materials were described.The second chapter showed the required reagents,equipments and methods of Ag/AgCl/BiFeO3 catalyst preparation.And the testing standard and evaluation method of the photocatalyst were also listed.The third chapter introduced the characterization of the photocatalyst.Then the preparation,structure and property of photocatalyst were discussed.The forth chapter evaluated its photocatalytic properties.The photocatalytic properties of the samples were evaluated by degradation of methyl orange,rhodamine B,and methyl blue.Compared with the pure BiFeO3 and Ag/AgCl,photocatalytic performance of Ag/AgCl/BiFeO3 improved significantly under visble-light.Then a possible mechanism was proposed on the basis of band structure analysis and the active species trapping test results.The stability and recyclability of the as-synthesized samples were evaluated and the results showed that the photocatalysts remain effective and stable.Last but not least,there are conclusions and prospects of the research.