摘要
以稻壳为模板及硅原,采用溶胶凝胶法制备了具有高锐钛矿含量、高比表面积和较优光催化性能的TiO2/SiO2纳米孔复合材料。采用综合热分析仪（TG-DSC）、X射线衍射分析（XRD）、扫描电子显微镜、和N2吸/脱附手段对所制材料的热学性能、显微结构和化学组成经行了表征。结果表明,复合材料中锐钛矿型TiO2在700～800℃热处理后开始转变为金红石TiO2,1000℃转变完全。当处理温度在500～600℃时,纳米二氧化钛颗粒在稻壳引理生长,形成催化活性点。随着处理温度的升高,二氧化钛在稻壳孔隙结构表面形成层状结构。处理温度500℃时,TiO2/SiO2纳米孔复合材料具有最佳的催化性能,对甲基蓝的降解4 h达82%。
TiO2/SiO2 nanoporous composite with high anatase content, high specific surface area and good photocatalytic activity was prepared by sol-gel process using rice husk（RH） as template.The thermal behavior, the microstructure and the chemical composition of the composite were characterized by TG-DSC, XRD, FESEM, EDS and nitrogen physisorption.The results show that the transformation of TiO2 from anatase to rutile begins at 700～800 ℃ and completes at about 1000 ℃.When the TiO2/SiO2 nanoporous composite is annealed at 500 or 600 ℃, nano-TiO2 cells are arranged in linear ridges and furrows, and the catalytic activity points are formed.Along with the increase of treatment temperature, nano-TiO2 cells form a layered structure on the surface and fill the pores of RH.TiO2/SiO2 nanoporous composite annealed at 500 ℃ exhibits the highest photodegradation efficiency of methyl blue, which is about 82% within 4 h.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第7期1607-1611,共5页
Rare Metal Materials and Engineering
基金
the Pre-Research Project of National Key Basic Research Program(2012CBT22702)
the New Century Excellent Talents Program of Ministry of Education(NCET-10-0137)
