关键词: 纳米二氧化钛;薄膜;低温制备;微流控芯片;水热处理

Abstract: Nano-TiO2 thin film was prepared in a microfluidic chip by sol-gel method at low temperature followed by hydrothermal treatment.The influence of hydrothermal conditions such as treatment of the sol-gel,flow rate of hot water,hydrothermal treating time on the photocatalysis performance and stability of the TiO2 films in microfluidic chip were investigated.And the effects of thickness of the TiO2 films and doping of elements on the photocatalytic degradation efficiency were studied.When the TiO2 film was treated under the hydrothermal treatment condition of flow rate 100 μL/h for 3 h,the degradation rate of Methylene Blue trihydrate in the 5 layer coated microfluidic chip reaches to 42.9％.The TiO2 film has good stability in its photocatalytic efficiency.The photocatalytic efficiency of the TiO2 film is improved greatly when Si is doped into the TiO2 sol-gel film,which make the degradation rate of the methylene blue reaches up high to 97.1％.

Key words: nano-titanium dioxide;thin film;low temperature preparation;microfluidic chip;hydrothermal treatment