| In recent years,the discharge of industrial wastewater and the irrational treatment of domestic water have caused serious pollution to our ecological environment.How to degrade pollutants efficiently is an important problem to be solved.In this paper,two kinds of composites based on MoS2?MoS2/BiVO4 and MoS2/ZnS?were prepared by hydrothermal method.The photocatalytic properties of these composite materials were studied.The main research works are as follows:1.The effect of size on the photocatalytic performance of MoS2 nanocomposites was investigated The results show that the photocatalytic performance of MoS2 with small size is better.For the methylene blue?MB?reagent,the degradation rate was up to 41.4% after illumination for 120 minutes.2.The effect of material ratio on the morphology and photocatalytic performance of MoS2/BiVO4 composites was investigated.The test results show that the morphologies of MoS2/BiVO4 were changed by different materials ratio.Compared to the pure material of MoS2,composite materials have better photocatalytic degradation effect on the methylene blue dye under the condition of visible light.And with the increasing amount of BiVO4,the photodegradation ability of composite material is gradually improved.When the molar ratio of MoS2:Bi?NO3?3:NH4VO3 is 6:5:5,the photodegradation degradation ability of MBV5 sample is the highest which is up to 71% after illumination for 120 minutes.3.The effects of MB concentration on the photocatalytic performance of MoS2/ZnS composites were investigated.The test results show that the size of MoS2/ZnS microsphere is about 2?m,and the crystal quality is good.The photocatalysis results show that composite materials have better photocatalytic degradation effect on the methylene blue dye under the condition of visible light.When the content of the dye is 15mg/L and the content of the catalyst additive is 20 mg,the degradation ratios can be nearly up to 99.8% after 120 minutes of irradiation. |
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