| Semiconductor sulfide is a novel semiconductor material with suitable band gap,good chemical stability,low toxicity and low price.It has attracted widespread attention from scholars in recent years.At the same time,semiconductor sulfide has good ability to absorb visible light and near-infrared light,so it can be used as a promising visible light photocatalyst and wide-band semiconductor sensitizer.The photocatalytic performance of a single sulfide is not ideal.This is because the photogenerated electrons and holes separated under the light cannot be transferred in time,the recombination rate is high,and the photocatalytic performance is greatly reduced.In order to effectively improve the photocatalytic performance of visible light,the P-type semiconductor material and N-type semiconductor sulfide are compounded to form a heterostructure,which effectively transfers photo-generated electrons and holes,and reduces the recombination efficiency of photo-generated carriers.This is Currently the most effective method to solve the poor performance of a single catalyst.In the dissertation,a P-type semiconductor and an N-type semiconductor are used to form a composite of SnO2-MoS2 and CuS-SnS2,and the advantages of the two elementary materials in the composite structure are complemented by composite modification,thereby expanding its optical,semiconductor materials and photocatalysis And other fields.The main research contents and conclusions are as follows:1)SnO2-MoS2 heterostructure was synthesized by a simple one-step hydrothermal method.The structure,composition and morphology of the samples were characterized by XRD,XPS,SEM,(HR)TEM and Raman spectroscopy.The photocatalytic performance of the samples was judged by the degradation of two dyes,namely methylene blue(MB)and rhodamine B(RhB).Under visible light irradiation,the photocatalytic performance of all composite samples is better than pure MoS2 or SnO2,of which 60%SnO2-MoS2 has excellent photocatalytic performance,has a large degradation rate of pollutants,and has good reusability.The efficient photocatalytic activity of SnO2-MoS2 heterostructure is due to its composite structure with higher specific surface area and enhanced visible light absorption,which effectively improves the separation of electron-hole pairs.2)A SnS2 nanosheet is used as a carrier,and a CuS-SnS2 composite heterostructure is formed by being compounded with CuS nanoparticles with different contents.XRD,XPS,Raman,UV diffuse reflectance spectroscopy,and degradation of various organic substances were used to analyze the structure of the experimental samples and analyze the photocatalytic performance,and explore the relationship between structure and performance.The experimental results show that the combination of the two significantly improves the original basic morphological characteristics,resulting in a significant improvement in the photocatalytic performance of the composite structure under visible light.Among them,the 10%CuS-SnS2 composite has the best degradation of organic compounds MB and RhB Capabilities are also very repeatable.This study provided a method for synthesizing CuS and SnS2 composite structures,and proved that the composite structures can effectively improve the photocatalytic performance of visible light.The above research shows that it is feasible to synthesize P-type semiconductors and N-type sulfide semiconductor materials to improve photocatalytic performance by hydrothermal method.The composites have a significant improvement in structure and photocatalytic degradation of organics.This will provide a reference for the application of sulfide semiconductors such as MoS2 and SnS2 in the fields of photocatalysis,materials science and environmental governance,and open up the horizon for photocatalytic degradation of organics for environmental governance.Figure[25]table[5]reference[153]... |
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