以尿素为前驱体,采用热解法合成了石墨相g-C_3N_4;以SnCl_4·5H_2O和硫代乙酰胺为前驱体,采用水热法合成超薄六边形SnS_2纳米片。再将SnS_2与g-C_3N_4以不同质量比复合,采用简便的超声分散法制备了超薄的SnS_2/g-C_3N_4异质结光催化剂。采用紫外—可见漫反射光谱(UV—VisDRS)、紫外—可见光谱(UV—Vis)等对其进行了表征。通过甲基橙的可见光催化降解,评价了SnS_2/g-C_3N_4异质结光催化剂的可见光催化活性。当SnS_2与g-C_3N_4质量比为0.05时,SnS_2/g-C_3N_4异质结光催化剂的光催化活性最高,在该条件下,可见光照射1h,甲基橙的光催化脱色率达到48.2%。 Graphite phase g-C_3N_4 was synthesized by pyrolysis using urea as precursor. SnO_2 nanosheets with SnC_4 · 5H_2O and thioacetamide as precursors were hydrothermally synthesized. The SnS_2 / g-C_3N_4 heterostructured photocatalyst was prepared by simple ultrasonic dispersion method by compounding SnS_2 and g-C_3N_4 with different mass ratios. It was characterized by UV-VisDRS, UV-Vis and so on. The visible light photocatalytic activity of SnS_2 / g-C_3N_4 heterojunction photocatalysts was evaluated by visible light photocatalytic degradation of methyl orange. When the mass ratio of SnS_2 to g-C_3N_4 was 0.05, the photocatalytic activity of SnS_2 / g-C_3N_4 heterojunction photocatalyst was the highest. Under this condition, the photocatalytic decolorization rate of methyl orange reached 48.2% under visible light irradiation for 1 hour.