纳米TiO_2-硅酸铝纤维的制备及光催化脱汞研究  

COMPOSITES OF NANO TiO_2-ALUMINIUM SILICATE FIBER FOR PHOTOCATALYTIC REMOVAL OF MERCURY VAPOR

作　　者：杨珊[1] 张军营[1] 袁媛[1] 汪文哲[1] 郑楚光[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《工程热物理学报》2011年第1期152-156,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.40972102;No.50906031);国家重点基础科研发展规划项目(No.2010CB227003)

摘　　要：采用溶胶凝胶法以硅酸铝纤维布(fiber)为载体通过不同溶胶配比制备纳米TiO_2-硅酸铝纤维(TiO_2-fiber)复合物使用X射线衍射仪(XRD)及场发射扫描电镜(FSEM)等手段对其进行表征;在波长为253.7 nm的紫外光(UV)照射下使用复合物进行多种工况下的光催化脱汞试验,验证催化脱汞性能。结果表明,复合物表面TiO_2纳米微粒尺寸可控制在10～20 nm左右;紫外光照射下脱汞率最高可达95%,催化脱汞性能优异;溶胶醇酸比为2/1时,复合物催化活性最强;气氛组分、光照强度及温度等因素对催化反应有明显影响。A process by sol-gel method has been developed to synthesize a novel composite catalysts of nano-scale TiO2coated on fabrics made of aluminium silicate fibers.X-ray diffraction microscopy （XRD）,Field scanning electron microscopy（FSEM） testing methods were utilized to characterize the catalysts.Photocatalytic experiments with the catalysts for mercury removal were carried out in a lengthways reactor with an on-line mercury monitor under UV irradiation at the wave length of 253.7nm.The results show that a homogeneous coating of nano- TiO2 particulates on the surfaces of the fibers with diameters in the range of 10～20 nm was effectively achieved.With the irradiation of UV the removal rate of mercury vapor could reach 95%.The composites demonstrate optimal catalysis with a C2H5OH/CH3COOH of 2/1.Other factors also exhibit considerable impact on the removal of mercury,such as the composition of the sol,intensity of UV irradiation and reaction temperature.

关 键 词：纳米TiO2-fiber复合物 溶胶凝胶法 单质汞 光催化脱除 

分 类 号：TK123[动力工程及工程热物理—工程热物理]