Abstract: This study prepared tin disulfide (SnS2 ) photocatalysts with different dominant crystal facets exposed using a hydrothermal method,and systematically investigated their structure,morphology,photocatalytic performance,and mechanisms. The SnS2 samples were characterized using X-ray diffraction (XRD),scanning electron microscopy (SEM),and ultraviolet-visible diffuse reflectance spectroscopy (UV-DRS). The results indicated that SnS2 with exposed (001),(101),and (110) crystal facets were successfully synthesized,exhibiting block-like,flower-like,and hexagonal flake morphologies respectively. Under simulated sunlight irradiation,the crystal facets of SnS2 demonstrated significant catalytic oxidation anisotropy for sodium butyl xanthate (SBX),following the order (101),(001),(110). The superior photocatalytic activity of the (110) facet was attributed to its enhanced photogenerated carrier migration,reduced electron-hole recombination rate,and improved light absorption capacity. Radical quenching experiments revealed that 1O2 served as the primary active species in the photocatalytic degradation process. This research provided a theoretical basis for optimizing the performance of SnS2 photocatalysts through crystal facet engineering and offered references for their application in wastewater treatment. 

Key words: tin disulfide,hydrothermal synthesis,cystal facet control,photocatalysis,performance study