High thermostable ordered mesoporous SiO2-TiO2 coated circulating-bed biofilm reactor for unpredictable photocatalytic and biocatalytic performance

作者：Zhang, Linlin; Xing, Zipeng^*; Zhang, Hang; Li, Zhenzi; Wu, Xiaoyan; Zhang, Xiaodong; Zhang, Yan; Zhou, Wei

来源：Applied Catalysis B: Environmental , 2016, 180: 521-529.

DOI：10.1016/j.apcatb.2015.07.002

• Ordered mesoporous SiO2-TiO2
• Photocatalytic circulating-bed biofilm reactor
• Photocatalysis coupled biocatalysis
• High thermostability
• Trichlorophenol

Utilizing high thermostable ordered mesoporous SiO2-TiO2 as a precursor, macroporous polyurethane foam (PUF) as a floating biofilm carrier, the photocatalytic circulating-bed biofilm reactor (PCBBR) is fabricated via ultrasonic vibration and deposition approach. The prepared SiO2-TiO2/PUF carrier is characterized in detail by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, N-2 adsorption, scanning electron microscopy and energy dispersive spectroscopy. The results indicate that the ordered mesoporous SiO2-TiO2 network can be maintained and the presence of SiO2 can inhibit the anatase-to-rutile phase transformation during 800 degrees C calcinations. Furthermore, the prepared SiO2-TiO2/PUF carrier presents a hierarchical macro/mesoporous structure, filling the bacterium to the channels. The PCBBR exhibits good synergic effect for the refractory phenolic wastewater, and the total organic carbon removal ratio of high toxic 2,4,5-trichlorophenol is up to 97.5% after hydraulic retention time for 3 h, which is ascribed to the hierarchical macro/mesoporous structure in favor of pollutants adsorption, efficient photon utilization and microorganism loading. This novel ordered mesoporous SiO2-TiO2 coated circulating-bed biofllm reactor is promising in the environmental field.

• 出版日期2016-1
• 单位哈尔滨医科大学; 黑龙江大学