摘要：

以尿素为氮源,采用溶胶-凝胶法制备了氮掺杂纳米TiO₂粉末,以甲基橙溶液为模拟染料废水,分别在可见光、模拟太阳光和紫外光条件下,研究了氮掺杂纳米TiO₂光催化降解染料废水的性能。结果表明:氮掺杂可以提高TiO₂的可见光催化活性;氮含量和煅烧温度对氮掺杂TiO₂光催化活性影响较大,n(N)∶n(Ti)为10%且经500℃煅烧的氮掺杂TiO₂在可见光和模拟太阳光下均具有最佳的光催化活性;然而在紫外光下,氮掺杂TiO₂的光催化活性低于未掺杂的TiO₂样品。

关键词: 氮掺杂, 二氧化钛, 光催化, 染料废水

Abstract:

A series of N-doped titania powders have been prepared by sol-gel method using urea as nitrogen source.The photocatalytic degradation capacity of dyeing wastewater with N-doped titania powders is investigated under visible light,simulated sun rays and ultraviolet light,respectively.The results showed that N-doping can improve the photocatalytic activity of titania under visible light.Nitrogen content and calcination temperature can remarkably influence the photocatalytic activity of titania.When percentage of n(N)∶n(Ti) is 10% and the N-doped titania that is calcined at 500 ℃ possess,its photocatalytic activities under both visible light and simulated sun light are optimal.However,the photocatalytic activity of N-doped titania is lower than that of un-doped titania under ultraviolet light.

Key words: N-doping, titania(TiO₂), photocatalytic, dyeing wastewater

中图分类号: 

• X703.1