The Applications and Synthesis of TiO2-材料合成化学课件
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The temperature can be elevated much higher than that in hydrothermal method
The method has better control than hydrothermal methods of the size and shape distributions and the crystallinity of the TiO2 nanoparticles
Solvothermal Method
almost identical to the hydrothermal method except that the solvent used here is nonaqueous.
The preparation has the advantages
A versatile method for the synthesis of a variety of nanopa rticles with narrow size distribution and dispersity
Sol-Gel Method Micelle and Inverse Micelle Methods
Sol Method Hydrothermal Method Solvothermal Method
……
Sol-Gel Method
Precursors: TiX4
Ti(OR)4
Solution: Water Alcohol Acid …
Rutile
Anatase Brookite
Rutile structure
➢ O2- ions are in HCP. ➢ TiO6 are in corner-sharing
along a and b directions ;in edge-sharing along c direction. ➢ Crystal system :tetragonal. ➢ Unit cell dimensions : a=4.5937Å ;c=2.9587Å .
The Applications and Synthesis of TiO2
Outline
Introductions of TiO2 Synthesis Methods of TiO2
Applications
Brief introduction of TiO2
Three main types of TiO2
TiCl4
Add slowly
TiO2 calcinated at 450 ℃ for 5 h
Figure.TEM image of TiO2 nanoparticles derived from reaction of TiCl4.
The particle size could be selectively adjusted in the range of 4-8 nm with the appBiblioteka Baiduopriate thermal conditions and a proper choice of the relative amounts of benzyl alcohol and titanium tetrachloride.
Anatase structure
O2- are in CCP. TiO6 are all in edge-sharing. Crystal system : tetragonal. Unit cell dimensions :
a=3.7845Å; c=9.5143Å
Synthesis Methods of TiO2
The particle growth depended strongly on temperature, and lowering the titanium tetrachloride concentration led to a considerable decrease of particle size
filtration Treated at 240 ℃ for 2h
dried at 60 ℃
washed with deionized water
the particle size decreased with increasing alkyl chain length
The peptizers and their concentrations influenced
polycondensation,
form 3D polymeric
dry,
skeletons Sol
calcinate
Gel
TiO2
Micelle and Inverse Micelle Methods
reactants
nonaqueous media
Inverse Micelle
reactants
Hydrothermal Method
Main process
0.5 M (CH3)2CHOH Ti(OC4H10)4 （H2O/Ti=150）
deionized water
tetraalkylammonium hydroxides N(OC2H5)4OH
peptized at 70 ℃ for 1h
the morphology of the particles.
TiO2
Figure 1 .TEM images of TiO2 nanoparticles prepared by the hydrothermal method.
Figure 2 . TEM image of TiO2 nanorods prepared with the hydrothermal method （changing the solvent compositions）
aqueous media
Micelle
Sol Method Equation of the reaction
Main process
Anhydrous benzyl alcohol
vigorous stirring 40℃ 1 day Room temperature
precipitate
Wash thoroughly
The method has better control than hydrothermal methods of the size and shape distributions and the crystallinity of the TiO2 nanoparticles
Solvothermal Method
almost identical to the hydrothermal method except that the solvent used here is nonaqueous.
The preparation has the advantages
A versatile method for the synthesis of a variety of nanopa rticles with narrow size distribution and dispersity
Sol-Gel Method Micelle and Inverse Micelle Methods
Sol Method Hydrothermal Method Solvothermal Method
……
Sol-Gel Method
Precursors: TiX4
Ti(OR)4
Solution: Water Alcohol Acid …
Rutile
Anatase Brookite
Rutile structure
➢ O2- ions are in HCP. ➢ TiO6 are in corner-sharing
along a and b directions ;in edge-sharing along c direction. ➢ Crystal system :tetragonal. ➢ Unit cell dimensions : a=4.5937Å ;c=2.9587Å .
The Applications and Synthesis of TiO2
Outline
Introductions of TiO2 Synthesis Methods of TiO2
Applications
Brief introduction of TiO2
Three main types of TiO2
TiCl4
Add slowly
TiO2 calcinated at 450 ℃ for 5 h
Figure.TEM image of TiO2 nanoparticles derived from reaction of TiCl4.
The particle size could be selectively adjusted in the range of 4-8 nm with the appBiblioteka Baiduopriate thermal conditions and a proper choice of the relative amounts of benzyl alcohol and titanium tetrachloride.
Anatase structure
O2- are in CCP. TiO6 are all in edge-sharing. Crystal system : tetragonal. Unit cell dimensions :
a=3.7845Å; c=9.5143Å
Synthesis Methods of TiO2
The particle growth depended strongly on temperature, and lowering the titanium tetrachloride concentration led to a considerable decrease of particle size
filtration Treated at 240 ℃ for 2h
dried at 60 ℃
washed with deionized water
the particle size decreased with increasing alkyl chain length
The peptizers and their concentrations influenced
polycondensation,
form 3D polymeric
dry,
skeletons Sol
calcinate
Gel
TiO2
Micelle and Inverse Micelle Methods
reactants
nonaqueous media
Inverse Micelle
reactants
Hydrothermal Method
Main process
0.5 M (CH3)2CHOH Ti(OC4H10)4 （H2O/Ti=150）
deionized water
tetraalkylammonium hydroxides N(OC2H5)4OH
peptized at 70 ℃ for 1h
the morphology of the particles.
TiO2
Figure 1 .TEM images of TiO2 nanoparticles prepared by the hydrothermal method.
Figure 2 . TEM image of TiO2 nanorods prepared with the hydrothermal method （changing the solvent compositions）
aqueous media
Micelle
Sol Method Equation of the reaction
Main process
Anhydrous benzyl alcohol
vigorous stirring 40℃ 1 day Room temperature
precipitate
Wash thoroughly