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采用化学沉淀法合成了不同AgI质量比例的AgI /g-C3N4复合材料.通过SEM、XRD、FT-IR和UV-Vis DRS对制备的复合材料进行表征,在可见光照射下,测试了其光催化氧化降解孔雀石绿(MG)染料的性能.结果表明:制备的AgI /g-C3N4复合材料具有较好的可见光响应性,且对MG具有较高的光催化降解活性.在可见光照射2 h,AgI /g-C3N4(20％)投加量为1 g /L的条件下,对染料废水中质量浓度为10 mg /L的MG降解率达到98.8％,不同AgI质量比例的AgI /g-C3N4对MG降解过程均符合一级动力学模型.“,”AgI /g-C3N4 composites with different mass ratios were synthesized by chemical precipitation method. The composites were fully characterized by means of SEM,XRD,FT-IR and UV-Vis DRS,and their photocatalytic degradation performance of malachite green (MG) dyes was tested under visible light irradiation. The results showed,the prepared AgI /g-C3N4 composites had good visible light response,and high photo-catalytic degradation performance of MG. And the degradation rate of MG dye wastewater with the concentration of 10 mg /L reached 98.8％ under the condition of visible light irradiation for 2 h and AgI /g-C3N4 (20％) dosage of 1 g /L,and the degradation of MG by all AgI /g-C3N4 composites made with different AgI mass ratios met the first-order kinetics model.