[Influence of doping the nanosized SiO2 powder on structure and activity of photocatalytic films].
Regard to the poor adsorbability of the fixing film photocatalyst, a new TiO2 thin film by doping the nanosized SiO2 power with large specific surface area into sol for coating film was prepared. According to the results of characterization by XRD, SEM, FTIR techniques, it was found that the films were mainly anatase structure, containing a little rutile and its mean crystallite size was about 27 nm. And doped SiO2 was dispersed into films forming the amorphous cluster with the size form more than ten nanometers to scores of nanometers. The doping of SiO2 had no effect on the crystal structure and the surficial group of TiO2, except for increasing specific surface area. The result of photocatalytic degradation showed that activity of the film doped by SiO2 largely increased and was greatly influenced by the size and amount of doped SiO2. Besides, this photocatalyst also had very good stability. During the course of continuous experiment for more than 30 days, removal efficiency of reactive brilliant red X-3B was kept at about 80% all the time.
Chen
Zhongying
Z
Environment Simulation and Pollution Control State Key Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084.
Yu
Gang
G
Zhang
Pengyi
P
Jiang
Zhanpeng
Z
D002384:Catalysis; D008027:Light; D011208:Powders; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D011208:Powders; C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium