采用沉积-沉淀法将Au纳米颗粒均匀地负载在花状TiO₂表面，成功制备了花状Au-TiO₂等离子体催化剂，并将其应用于可见光催化、臭氧氧化、二者联用降解废水中酚类污染物。结果表明，酚类污染物在不同氧化方式下的降解速率为：Au-TiO₂/O₃/Vis > Au-TiO₂/O₃ > O₃ > Au-TiO₂/Vis；不同的酚类污染物降解速率为：水杨酸 > 2-氯苯酚 > 苯酚。Au-TiO₂/O₃/Vis具有比单独臭氧更强的氧化能力，不仅能更快地降解酚类污染物，更为重要的是可见光催化的引入还能够将单独臭氧难以降解的中间产物草酸进一步降解，二者联用的协同效应促进了酚类污染物进一步的矿化。

A plasmonic Au-TiO₂ with flower-like structure is prepared by deposition-precipitation method.The prepared Au-TiO₂ catalyst is applied to visible light-driven photocatalytic ozonation for degradation of phenolic organic pollutants in wastewater.Degradation rates of phenolic pollutants are compared in the processes of photocatalytic,ozonation,catalytic ozonation and photocatalytic ozonation.The concentration of oxalic acid which is a typical intermediate product in the degradation process of phenolic pollutants is also detected.It is shown that the highest degradation rate is achieved in visible light-driven photocatalytic ozonation,followed by photocatalytic ozonation,ozonation and visible light-driven photocatalytic method.Among phenolic pollutants,salicylic acid holds the highest degradation rate,followed by 2-chlorophenol and phenol.The concentration of the produced oxalic acid increases firstly and decreases then with the prolonging reaction time,demonstrating that oxalic acid can be further degraded in photocatalytic ozonation,thereby leading to a high mineralization rate.

赵振悦(1995-),男,硕士研究生,研究方向为高级氧化技术降解有机污染物,20368029426@qq.com