Diatomite-based Photocatalyst Preparation And Its Degradation Performance On Diesel

With the development of offshore petroleum resources,people will inevitably cause more and more serious offshore oil pollutants.Among the many technologies that deal with offshore petroleum pollutants,photocatalytic technology is drawing attention due to its high efficiency and non-pollution characteristics.In this paper,a seriesofdiatomite-basedcompositephotocatalystsweresynthesizedby sedimentation-precipitation and solvothermal methods using diatomite as carrier.The photocatalytic degradation of offshore petroleum pollutants by photocatalysts was also studied.In this paper,the following studies were carried out:Ag/AgBr-diatomite composite photocatalysts,AgI/diatomite photocatalysts and Bi₂MoO₆/diatoms were synthesizedbyprecipitation-deposition-photoreduction,precipitation-Soil photocatalyst.The catalysts were characterized by X-ray diffraction?XRD?,scanning electron microscopy?SEM?,infrared spectroscopy?FT-IR?and UV-vis diffuse reflectance spectroscopy And so on.By degrading rhodamine B and the corresponding capture experiments,understand the degradation mechanism of each photocatalyst.At last,the 0#diesel oil was degraded by using different catalysts synthesized under ultraviolet light respectively.The results show that:?1?Ag/AgBr composites well with diatomite to form Ag/AgBr-diatomite composite photocatalyst.When the ratio of Ag/AgBr to diatomite is 4:1,The catalytic experiments showed that h⁺and O₂^-were the main active substances during the degradation of RhB.Degradation of diesel showed that when the mass ratio of Ag/AgBr to diatomite was 4:1,60 mg of catalyst was irradiated under UV light 5h,diesel solution concentration of50mg/L,diesel removal rate of the best,reaching 61.2%.?2?AgI and diatomaceous earth are well compounded together to form AgI/diatomite composite photocatalyst,and the degradation of RhB experiment shows that compared with the pure sample,the photocatalytic activity of AgI/diatomite composite photocatalyst The performance was obviously improved.When the AgI/diatomite mass ratio was 5%,the highest catalytic activity reached 79.19%.The capture experiments showed that h⁺and O₂^-were the main active substances.Diesel degradation experiments showed that when the mass ratio of AgI to diatomite was 5%,80 mg of catalyst was irradiated under ultraviolet light for 5 h,degrading 50 mg/L diesel solution,the best removal rate of diesel reached 45.6%.?3?Degradation RhB experiments showed that when the mass ratio of Bi₂MoO₆ to diatomite was 70%,the photocatalytic activity was the strongest,reaching 97.6%.The capture experiments showed that h⁺and O₂^-were the main active materials.The final diesel degradation experiments show that when the mass ratio of Bi₂MoO₆ and diatomite is 70%,80mg of the composite photocatalyst is exposed to ultraviolet light for 5h,the degradation rate of diesel oil is 50mg/L,the best diesel removal rate is 44.2%.