Preparation And Properties Of Molybdenum Disulfide Composite Modified Ruthenium Based Visible Light Catalyst

In this dissertation,a series of bismuth oxides were prepared and modified by different methods to improve the phtocatalytic activity.The properties of these materials were characterized by XRD,SEM,TEM,XPS,BET,UV-Vis DRS and PL.Then,Rhodamine B?RhB?,methyllene blue?MB?,and methyl orange?MO?were used as the simulated pollution sources to explore the photocatalytic properties of the samples.Combine their characterization and free radical quenching experiments to explore their catalytic mechanism.The main contents can be divided into three parts as followings:1.The binary composite photocatalyst Bi/MoS₂ was prepared by combining elemental Bi spheres and layered structure MoS₂.The amount of Bi was adjusted to prepare Bi/MoS₂composite photocatalysts with different ratios.The catalytic activity of photocatalyst was detected by degrading rhodamine B and methyl orange to find the optimum ratio of composite photocatalyst.It is found that the photocatalytic performance of Bi/MoS₂composites synthesized by hydrothermal method is much better than that of elemental Bi spheres and layered structure MoS₂.A series of characterizations and experiments have shown that the increase in photocatalytic activity of the complex is attributed to the doping of surface-modified metal spheroids which increases the separation rate of photogenerated electrons and holes in the composite.The stability of the composite photocatalyst was judged by repetitive experiments.At the same time,the photocatalytic reaction mechanism was explored by free radical trapping experiments.It was found that the main active substance of the catalytic reaction was·O₂^-.2.The Bi/BiOCl/MoS₂ composites with different mass ratios of MoS₂ and BiOCl were prepared by solvothermal method on the MoS₂/BiOCl binary composites.By degrading rhodamine B and methylene blue,the photocatalytic properties of the composites were found to be higher than those of the constituent compounds,and the best ratio of composites was found.The stability of the photocatalyst was evaluated by repeated experiments,and the possible degradation mechanism was explored by free radical trapping experiments,and h+was found to be the main active substance.3.BiOI and MoS₂ were combined and doped with metal Bi to prepare a new photocatalyst Bi/BiOI/MoS₂ with different mass ratio of BiOI to MoS₂.The photocatalytic activity of the photocatalyst was detected by degrading rhodamine B and methylene blue,and it was found that the activity of the ternary complex was the highest.In addition,the optimum ratio of composite photocatalysts was found by comparing the photocatalytic properties of the different ratios of the ternary composites.A series of characterizations and experiments show that the photocatalytic activity of the composite is improved because the synergistic action of metal ruthenium and MoS₂ regulates the band structure of BiOI,reduces the forbidden band width of BiOI,and enhances the absorption of visible light.The stability of the composite photocatalyst was investigated by repeated experiments,and the reaction mechanism was explored by the capture experiment to find out that the main active substance was h⁺.