Preparation And Photocatalytic Performance Of Tungsten-containing Nano-photocatalyst

The increasingly serious problem of energy shortages and over-exploitation of fossil energy has severely restricted the implementation of my country’s sustainable development strategy,and it is urgent to find and develop a clean and efficient energy source.Photocatalytic technology can convert solar energy into hydrogen energy and degrade pollutants,so it has been one of the hot research fields in recent years.In this article,we have constructed a series of tungsten-containing nano-photocatalysts based on tungsten-containing nanomaterials.At the same time,we have studied their photocatalytic performance and electron transfer mechanism.The main research contents and results are as follows:First,the non-equal compound CuWO_4-x nanoparticles were prepared by hydrothermal method,and then the porous brookite phase Ti O₂ nanospheres embedded with multiple CuWO_4-x particles were constructed using the compound as the core.On this basis,the photocatalytic hydrogen production behavior of the obtained samples was discussed in more detail.The photocatalyst has excellent photocatalytic hydrogen production performance.Under the optimal hydrogen production conditions,its photocatalytic hydrogen production rate reaches 9.85 mmol g^-1 h^-1.In the follow-up,the reproducibility of the catalyst was also explored.In the re-replication of hydrogen experiment,after two re-replication of hydrogen,its catalytic activity still remained at about 90%of the original activity of the catalyst.In addition,the mechanism of its photocatalytic hydrogen production has also been studied.After research,it is found that the electron transfer mechanism of the catalyst may follow the Z-Scheme electron transfer mechanism.Secondly,based on ZnWO₄ nanosheets,the EY-ZnWO₄/Cu O photocatalytic system was constructed by loading Cu O nanoparticles and eosin Y sensitization.At the same time,the photocatalytic hydrogen production activity of the system was explored.Under the optimal conditions,the hydrogen production rate can reach 4.9 mmol g-1 h-1.Furthermore,under light irradiation with different light intensity,we conducted a more systematic evaluation of the photocatalytic hydrogen evolution activity of the system.The results show that the EY-ZnWO₄/Cu O photocatalytic system is a photocatalytic system whose energy utilization rate has nothing to do with light intensity.Here,the excellent performance of the system should be attributed to the broadening and enhancement of the light absorption band brought about by eosin Y sensitization,and the more effective separation of electrons and holes caused by the loading of Cu O nanoparticles.Finally,we comprehensively investigated the use conditions of the prepared CuWO_4-x/b-Ti O₂ photocatalyst,from the light intensity,the concentration of the photocatalyst,the concentration of the sacrificial agent,the p H environment used to the post-treatment method,etc.,and the photocatalytic hydrogen production of the sample The influence of behavior.Through a series of condition experiments,it can be concluded that the catalyst concentration,the concentration of sacrificial agent,the p H value of the photocatalytic system and the microwave-sodium borohydride post-treatment have obvious effects on the photocatalytic activity of the photocatalytic system.This provides a good reference for the practical application of subsequent photocatalysts.