纳米TiO2 光催化剂的研究及市场情况介绍
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Journal of Photochemistry and Photobiology C: Photochemistry Reviews 13 (2012) 169–189
Kazuya Nakata, Akira Fujishima
Recent developments in photocatalytic water treatment technology: A review
Water research 44(2010): 2997-3027
Meng Nan Chong, etc.
An Economic Method to Prepare Vacuum Activated Photocatalysts with High Photo-activities and Photosensitivities. ( TiO2 P25)
Key steps: Effective separation of photo-generated electron/hole pairs Separated electrons and holes shift to the substance adsorbed by TiO2.
Properties of TiO2 photocatalyst
Photocatalytic activity is influenced by
Crystal phase Particle size Defects The concentration of surface hydroxyl groups
Photocatalytic activity: anatase > rutile, brookite exhibits no photocatalytic activity
TiO2 photocatalyst: Challenge
Low quantum efficiency (~4%). It is difficult to deal with industrial waste-gas or waste-water with large quantity and high concentration. Low utilization of solar energy. TiO2 semiconductor can only absorb ultraviolet light (~4 % of sunlight), due to its band structure (Eg = 3.2 eV). Load technology of photopcatalyst. It’s difficult to load the photocatalyst firmly and uniformly on different materials’ surface under the premise of maintaining high photocatalytic activity and meet requirements of specific materials’ phycical-chemical properties. Research on super-hydrophilicity mechanism and film technique.
Properties of TiO2 photocatalyst
1. Photocatalysis Mechanism of TiO2
Basic reactions of TiO2 in the solution under UV irradiation
(a): surface recombination of external holes and photo-induced electrons transferred to its surface, (b) photo-induced electrons transfer to its surface to reduce the acceptor, (c) volume recombination of photo-induced electrons and photo-induced holes, (d) photo-induced holes diffuse to its surface to oxidize donor
Tile packaging Textiles coating
Water treatment device
Technical Information:
Applications
formed, preventing the fogging;
Once the surface turns into the highly hydrophilic state, it remains unchanged for several days or one week.
Properties of TiO2 photocatalyst
Marketing information
What is photocatalysis?
Photocatalysis is the acceleration of a photoreaction in the presence of a catalyst: light is absorbed by catalyst to create electron–hole pairs, which generate free radicals (e.g. hydroxyl radicals: •OH), able to undergo secondary reactions. Among lots of photocatalysts, TiO2 becomes a very suitable and brilliant one for its advantages of low-cost, non-toxicity, chemical stability, anti-photocorrosion, high photocatalytical activity, etc.
TiO2 Photocatalyst
Emma Dong
Oct 10, 2014
Agenda
TiO2 Photocatalyst
Properties Technical information
Marketing information
Agenda
TiO2 Photocatalyst
Properties Technical information
Gas decomposition
Anti bacteria
Water purification
Mirror Glass coating
Tile Tent Glass PVC fabric Tunnel External wall coating
Air purifier Curtain Wall paper Window shade lamp Refrigerator Concrete coating
Titanium dioxide photocatalysis: present situation and future approaches
C. R. Chimie 9 (2006) 750–760
Akira Fujishima, Xintong Zhang
TiO2 photocatalysis: Design and applications
Author
Amy L. Linsebigler, etc.
TiO2 Photocatalysis: A Historical Overview and Future Prospects
Japanese Journal of Applied Physics 44(2005): 8269
Kazuhito HASHIMOTO, etc.
Rutile
Anatase
Brookite
Super- hydrophilicity: anatase > rutile > amorphous brookite exhibits no superhydrophilicity
Agenda
TiO2 Photocatalyst
Properties Technical information
Two mechanisms of self-cleaning
Due to water soaks between the stains and the highly hydrophilic TiO2 surface, the stains absorbed on TiO2 surface can be washed by water.
Technical Information: Technical Report
Title
Photocatalysis on TiO2 Surfaces: Principles, Mechanisms, and Selected Results
Chem. Rev. 95(1995): 735-758
Marketing information
Technical Information: Milestone & Challenge
TiO2 photocatalyst: Milestone
A. Fujishima and K. Honda, Nature, 1972, 238, 37–38: Electrochemical photolysis of water at a semiconductor electrode R. Wang, etc. Nature, 1997, 388, 431–432: Light-induced amphiphilic surfaces
Technical Information: Method
Modified
LUMO
CB
Ti3d
synergistic effect
surface plasmon resonance Fe3d
Fe3+/Fe2+ HOMO
TiO2
effect N2p synergistic h O2p VB
-
Au
Co-doping vario-property between surface modification with organics doping doping Surface with with deposit non-metal metal Fe ofN and noble and others others metal metal and non-metallic elements
2. Photo-induced super-hydrophilicity
Hydrophilic Angle: 72º(before the light) →0º(after the light)
Self-cleaning Mechanism
Properties of TiO2 photocatalyst
Properties of TiO2 photocatalyst
Anti-fogging MechanismBiblioteka Baidu
The fogging of the surface occurs when steam cools down to form many water droplets; No water drops are formed on a highly hydrophilic surface. Instead, a uniform thin film of water is
Chem. Commun., 2011,47, 4947-4949
Mingyang Xing, etc.
Technical Information:
Applications
TiO2 + Light
Hydrophilicity Decomposition reaction
Antifogging
Selfcleaning
Kazuya Nakata, Akira Fujishima
Recent developments in photocatalytic water treatment technology: A review
Water research 44(2010): 2997-3027
Meng Nan Chong, etc.
An Economic Method to Prepare Vacuum Activated Photocatalysts with High Photo-activities and Photosensitivities. ( TiO2 P25)
Key steps: Effective separation of photo-generated electron/hole pairs Separated electrons and holes shift to the substance adsorbed by TiO2.
Properties of TiO2 photocatalyst
Photocatalytic activity is influenced by
Crystal phase Particle size Defects The concentration of surface hydroxyl groups
Photocatalytic activity: anatase > rutile, brookite exhibits no photocatalytic activity
TiO2 photocatalyst: Challenge
Low quantum efficiency (~4%). It is difficult to deal with industrial waste-gas or waste-water with large quantity and high concentration. Low utilization of solar energy. TiO2 semiconductor can only absorb ultraviolet light (~4 % of sunlight), due to its band structure (Eg = 3.2 eV). Load technology of photopcatalyst. It’s difficult to load the photocatalyst firmly and uniformly on different materials’ surface under the premise of maintaining high photocatalytic activity and meet requirements of specific materials’ phycical-chemical properties. Research on super-hydrophilicity mechanism and film technique.
Properties of TiO2 photocatalyst
1. Photocatalysis Mechanism of TiO2
Basic reactions of TiO2 in the solution under UV irradiation
(a): surface recombination of external holes and photo-induced electrons transferred to its surface, (b) photo-induced electrons transfer to its surface to reduce the acceptor, (c) volume recombination of photo-induced electrons and photo-induced holes, (d) photo-induced holes diffuse to its surface to oxidize donor
Tile packaging Textiles coating
Water treatment device
Technical Information:
Applications
formed, preventing the fogging;
Once the surface turns into the highly hydrophilic state, it remains unchanged for several days or one week.
Properties of TiO2 photocatalyst
Marketing information
What is photocatalysis?
Photocatalysis is the acceleration of a photoreaction in the presence of a catalyst: light is absorbed by catalyst to create electron–hole pairs, which generate free radicals (e.g. hydroxyl radicals: •OH), able to undergo secondary reactions. Among lots of photocatalysts, TiO2 becomes a very suitable and brilliant one for its advantages of low-cost, non-toxicity, chemical stability, anti-photocorrosion, high photocatalytical activity, etc.
TiO2 Photocatalyst
Emma Dong
Oct 10, 2014
Agenda
TiO2 Photocatalyst
Properties Technical information
Marketing information
Agenda
TiO2 Photocatalyst
Properties Technical information
Gas decomposition
Anti bacteria
Water purification
Mirror Glass coating
Tile Tent Glass PVC fabric Tunnel External wall coating
Air purifier Curtain Wall paper Window shade lamp Refrigerator Concrete coating
Titanium dioxide photocatalysis: present situation and future approaches
C. R. Chimie 9 (2006) 750–760
Akira Fujishima, Xintong Zhang
TiO2 photocatalysis: Design and applications
Author
Amy L. Linsebigler, etc.
TiO2 Photocatalysis: A Historical Overview and Future Prospects
Japanese Journal of Applied Physics 44(2005): 8269
Kazuhito HASHIMOTO, etc.
Rutile
Anatase
Brookite
Super- hydrophilicity: anatase > rutile > amorphous brookite exhibits no superhydrophilicity
Agenda
TiO2 Photocatalyst
Properties Technical information
Two mechanisms of self-cleaning
Due to water soaks between the stains and the highly hydrophilic TiO2 surface, the stains absorbed on TiO2 surface can be washed by water.
Technical Information: Technical Report
Title
Photocatalysis on TiO2 Surfaces: Principles, Mechanisms, and Selected Results
Chem. Rev. 95(1995): 735-758
Marketing information
Technical Information: Milestone & Challenge
TiO2 photocatalyst: Milestone
A. Fujishima and K. Honda, Nature, 1972, 238, 37–38: Electrochemical photolysis of water at a semiconductor electrode R. Wang, etc. Nature, 1997, 388, 431–432: Light-induced amphiphilic surfaces
Technical Information: Method
Modified
LUMO
CB
Ti3d
synergistic effect
surface plasmon resonance Fe3d
Fe3+/Fe2+ HOMO
TiO2
effect N2p synergistic h O2p VB
-
Au
Co-doping vario-property between surface modification with organics doping doping Surface with with deposit non-metal metal Fe ofN and noble and others others metal metal and non-metallic elements
2. Photo-induced super-hydrophilicity
Hydrophilic Angle: 72º(before the light) →0º(after the light)
Self-cleaning Mechanism
Properties of TiO2 photocatalyst
Properties of TiO2 photocatalyst
Anti-fogging MechanismBiblioteka Baidu
The fogging of the surface occurs when steam cools down to form many water droplets; No water drops are formed on a highly hydrophilic surface. Instead, a uniform thin film of water is
Chem. Commun., 2011,47, 4947-4949
Mingyang Xing, etc.
Technical Information:
Applications
TiO2 + Light
Hydrophilicity Decomposition reaction
Antifogging
Selfcleaning