本文采用热聚合法和水热法成功制备了ZnO/g-C3N4系列复合光催化剂, 并对所制备样品的结构、形貌和光吸收性能等进行了表征和测试, 通过在可见光照射下降解亚甲基蓝(MB)和光解水产氢评估了样品的光催化性能。实验结果表明, 制备的ZnO/g-C3N4系列复合光催化剂性能均优于ZnO和g-C3N4样品。此外, 当ZnO和g-C3N4的摩尔比为1∶1时, 所制备ZnO/g-C3N4复合样品的光催化性能最好。一方面, 此样品仅在30 min后便达到了94.36%的降解率, 其降解速率分别是ZnO和g-C3N4的5.6和6.7倍; 另一方面, 此样品6 h光解水产氢量为11.75 mmol, 产氢速率是g-C3N4的7倍。研究表明, 所制备的ZnO/g-C3N4系列复合光催化剂在降解污染物和光解水产氢方面均展现出了优异的性能。同时, 本文还对ZnO/g-C3N4系列复合光催化剂的光催化降解和产氢机理进行了研究。

In this paper, ZnO/g-C3N4 series composite photocatalysts were prepared by thermal polymerization and hydrothermal method. The structure, morphology and light absorption properties of the prepared samples were characterized and tested. The photocatalytic performance of these samples was evaluated by the photocatalytic degradation of methylene blue (MB) and the photolysis aquatic hydrogen under visible light irradiation. The experimental results indicate that the performances of the ZnO/g-C3N4 composite photocatalysts are superior to those of ZnO and g-C3N4. Moreover, when the molar ratio of ZnO and g-C3N4 is 1∶1, the photocatalytic performance of the prepared ZnO/g-C3N4 composite samples is the best. On the one hand, the degradation rate of the 1∶1 composite sample reaches 94.36% after only 30 min, and the degradation rate is 5.6 and 6.7 times that of ZnO and g-C3N4, respectively. On the other hand, the photolysis aquatic hydrogen of the 1∶1 sample after 6 h is 11.75 mmol, and the photolysis aquatic hydrogen rate is 7 times that of g-C3N4. The results show that the ZnO/g-C3N4 composite photocatalyst has excellent performance in pollutant degradation and photolysis aquatic hydrogen. In addition, the photocatalytic degradation and photolysis aquatic hydrogen mechanism of ZnO/g-C3N4 series composite photocatalyst are also studied.