2. Silver-coated TiO2
More efficient
3. The time needed for photocatalyst reaction：
Visible light ＞ UV 4. Photoenhancement of different metal coating：
Cu:TiO2 > Au:TiO2 > Ag:TiO2 > TiO2
Outline
1 2 3
• Ag-coated TiO2 • Cr-coated TiO2 • Different metal comparison ( Au，Ag，Cu )
Ag-coated TiO2
HRTEM Analysis
Round shape and stacked on top of one another
Different metal comparison
Photocatalytic Activity ( visible light )
Different metal comparison
MB Degradation Kinetics Equation ( visible light )
Different metal comparison
Photocatalytic Activity Comparsion ( UV & Visible light )
( UV )
(Visible light )
Metal coated TiO2
Conclusions
1. TiO2 films
Degrade faster
No films
Plain TiO2 films
Different metal comparison
Optical Absorption Spectral
Different metal comparison
Photocatalytic Activity ( UV light )
Different metal comparison
MB Degradation Kinetics Equation ( UV light )
Background of TiO2
TiO2 的特点
净化空气：可将甲醛、苯，氮、硫等氧化物及氨等氧化 还原成为无害物质 自洁净：超亲水性和强氧化性使表面不易附着污染物 杀菌：不但能杀死细菌，还能够使之分解为CO2 和H2O 除臭：能强力分解甲醛、乙醛、甲酸、苯酚、尼古丁等
空气中异、臭味物质
SEM and TEM Analysis
Fig. 2. SEM and TEM images of 5% Cr/TiO2 nanoparticles
Cr-coated TiO2
Photocatalytic Activity Valuation
Different metal comparison
SEM Analysis
谢 谢！
Ag-coated TiO2
Spectral Absorbance
Absorbance of Ag-TiO2： Doubled in visible region and enhanced in UV region
Ag-coated TiO2
Photocatalytic Activity
Cr-coated TiO2
TiO2 Photocatalysis
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Outline
1 • Background of TiO2 • Photocatalysis mechanism of TiO2
• Metal coated TiO2
2
3
Background of TiO2
TiO2 : Rutile，Anatase，Brookite
防紫外：TiO2 光触媒具有吸收紫的特性
Background of TiO2
其它功能
纳米 TiO2 对某些塑料、氟里昂及表面活性剂 SDBS 也 具有很好的降解效果。
TiO2 对有害气体也具有吸收功能，如含 TiO2 的烯烃聚
合物纤维涂在含磷酸钙的陶瓷上可持续长期地吸收不同酸碱 性气体。
Photocatalysis mechanism
Reduction： O2 + e- → O2O2- + H2O → •OH + OH-
Oxidation： H2O + h+ → •OH + H+
Metal coated TiO2
There has been a lot of advantages for TiO2 Low-energy Environmentally safe Attractive But why shall we coat TiO2 ? For only UV light to excite the electrons; It will hinder commercialization.
Metal coated TiO2
The advantanges of coating TiO2
Reduce band gap
Trap the photo-generts as an antibacterial agent
Metal coated TiO2