文献类型：期刊文章

作　　者：张敬畅[1] 李青[1] 曹维良[1]

机构地区：[1]北京化工大学现代催化研究所,北京100029

出　　处：《无机化学学报》

基　　金：国家高技术研究发展计划(863计划)(No.2001AA322030);国家自然科学基金(No.20076004);高等学校博士点基金(No.2000001005)

年　　份：2004

卷　　号：20

期　　号：6

起止页码：725-730

语　　种：中文

收录情况：BDHX、BDHX2000、CAS、CSCD、CSCD2011_2012、IC、JST、RCCSE、RSC、SCI(收录号：WOS:000221754400022)、SCI-EXPANDED(收录号：WOS:000221754400022)、SCIE、SCOPUS、WOS、ZGKJHX、核心刊

摘　　要：TiO2-SnO2-SiO2 nanocomposite photocatalysts were prepared with Na2SiO3·9H2O, SnCl4·5H2O and TiCl4 as precursors by chemistry coating processes and supercritical fluid drying (SCFD) method. Characterizations with XRD, TEM, NMR and FTIR showed that in addition to anatase type TiO2, a new active phase(Ti,Sn)O2 was also formed in the range of the studied doping concentration, The catalytic activity was evaluated by photocatalytic degradation of phenol as model reaction. SiO2 remained amphorous at all samples. It could prevent from growth of the size of nanopaticle and transformation from anatase to rutile. Compared with pure TiO2, or TiO2-SnO2 catalyst prepared by Sol-gel method, Nano-composite photo-catalyst showed significant improvement in catalytic activity, the photo-catalytic degradation rate of phenol in 7 h reached 88.7%. Application of the composite catalysts for the photocatalytic decomposition of phenol not only gave the same activity relative to pure ultrafine TiO2, but also reduced cost. The experimental results also proved that the thermal stability of TiO2 was greatly enhanced after mixing with small amount of SiO2. The optimized doping of SiO2 was 20.3%. The photo-catalyst prepared by SCFD combination technology was characterized with smaller particle size, larger surface area and higher activity.

关 键 词：超临界流体干燥法  纳米材料  TiO2  SNO2 SIO2 光催化剂

分 类 号：O614.432] TB383[化学类]