光催化技术在污水处理方面具有较好的潜力，然而粉末催化剂在使用中容易造成二次污染问题。文章将石墨相氮化碳（g-C₃N₄）与聚氯乙烯（PVC）树脂复合，制备了负载型PVC/g-C₃N₄光催化复合材料，并对其催化性能以及稳定性进行研究。结果表明：g-C₃N₄负载到PVC，有效降低了g-C₃N₄团聚，表现较好的催化性能。PVC/g-C₃N₄-3在光照60 min后，甲基橙和罗丹明B的浓度最低，并且在10次循环后均表现出较好的稳定性。不同类型污水的光催化实验表明，PVC/g-C₃N₄-3复合材料具有较好的光催化污水净化性能，可以有效用于水体污染处理。

Photocatalytic technology has a good potential in wastewater treatment, but powder catalyst is easy to cause secondary pollution in use. In this paper, graphite phase carbon nitride (g-C₃N₄) was compounded with polyvinyl chloride (PVC) resin to prepare supported PVC/g-C₃N₄ photocatalytic composites, and its catalytic performance and stability were studied. The results showed that the loading of g-C₃N₄ to PVC effectively reduced the agglomeration of g-C₃N₄ and showed good catalytic performance. The concentration of methyl orange and rhodamine B in PVC/g-C₃N₄-3 was the lowest after 60 min of illumination, and it showed good stability after 10 cycles. The photocatalytic experiments of different types of sewage show that PVC/g-C₃N₄-3 composite has good photocatalytic sewage purification performance and can be effectively used for water pollution treatment.