Preparation of SnS2/C3N5 photocatalyst and its photocatalytic degradation of Methylene Blue
Tin disulfide/nitrogen rich carbon nitride(SnS2/C3 N5)photocatalyst is prepared by solvent evaporation method.The phase structure,characteristic groups,spectral absorption,photoelectron-hole recombination separation and electrochemical properties of the photocatalyst are characterized by XRD,FTIR,UV-vis DRS and PL patterns.The activity and stability of SnS2/C3 N5 photocatalytic degradation of Methylene Blue(MB)un-der simulated sunlight are evaluated.The results show that the degradation rate of MB reaches 96.6％after 60 min of simulated sunlight irradiation,and the degradation rate of MB is still greater than 95.0％after 10 cycles.SnS2/C3 N5 exhibits excellent photocatalytic activity and stability attributed to the construction of heterojunction between SnS2 and C3 N5,photoelectron-holes are effectively separated,and the charge transfer resistance is re-duced.Highly active superoxide radicals(·O2-)and holes(h+)degrade MB molecules into small molecule inor-ganics by attacking MB molecules.Based on the energy band structure and potential data,the Z scheme mech-anism of photocatalytic degradation of MB by SnS2/C3N5 is proposed.
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