Au/g-C₃N₄复合材料光催化降解亚甲基蓝

Photocatalytic Degradation of Methylene Blue by Au/g-C₃N₄ Composites

摘要: 利用煅烧–化学还原法制备了Au/g-C₃N₄系列样品，并对其光催化性能进行了探索。X射线衍射仪和扫描电子显微镜的表征结果显示Au成功负载在了g-C₃N₄上，紫外–可见漫反射光谱测得负载后的催化剂吸收边从450 nm红移至490 nm。光催化性能实验结果表明，负载纳米Au有效地提高了g-C₃N₄的对亚甲基蓝溶液的降解效率。当AuC-1的催化剂使用量为50 mg时，在60 min内对浓度为10 mg/L的亚甲基蓝溶液的降解率达到97.8%。AuC-1催化剂具有良好的循环稳定性。根据自由基捕获实验可知，降解污染物的主要活性物种是∙O₂^-。

Abstract: A series of Au/g-C₃N₄ samples have been prepared by calcination-chemical reduction method, and their photocatalytic properties were investigated. X-ray diffraction and scanning electron microscopy showed that gold nanoparticles were successfully implanted on g-C₃N₄, and the absorption edge of the supported catalyst was moved from 450 nm to 490 nm by UV-VIS diffuse light. The photocatalytic transfer experiment results show that the degradation efficiency of g-C₃N₄ for methylene blue solution can be improved effectively by loading Au nanoparticles. When the amount of AuC-1 catalyst was 50 mg, the degradation rate of methylene blue solution with a concentration of 10 mg/L reached 97.8% in 60 min. AuC-1 catalyst also has good cyclicity and stability. According to the free radical capture experiment, ∙O₂^- was the main active species of pollutant degradation.