Dissertation > Excellent graduate degree dissertation topics show

Preparation and Characterization of Mesoporous TiO2 Materials and Their Photocatalytic Activity

Author: HuangZuo
Tutor: WangJun；LiJun
School: Donghua University
Course: Environmental Engineering
Keywords: Sol-gel TiO2 Mesoporous materials Mesoporous titania thin film Aging time and temperature Doping Photoelectrocatalytic degradation
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 281
Quote: 2
Read: Download Dissertation

Abstract


Mesoporous titanium was usually used in the form of nanoparticles in suspension for high catalytic surface area and activity.They can effectively improve properties in photocatalytic applications for environmental remediation.The study show that mesoporous titanium has higher catalyst activity than nanometer titanium dioxide.Firstly,using cationic surfactant cetyltrimethylammonium bromide（CTAB）as the template,TiO2 and V/Ce/F-TiO2 mesoporous materials were synthesized by sol-gel method and characterized by X-ray powder diffractometry（XRD）,N2 absorptiometry, transmission electron microscope（TEM）,thermal analyses（TG/DTA） and UV-vis DRS.By systematically studying the influence of the synthesis parameters such as gelling time,aging temperature and aging time,we have established optimal conditions for reproducible synthesis of mesoporous titania.Specific area up to 189m2·g-1 was obtained with average pore size in the rang of 3.1-5.1 nm.The mesoporous structure of pure TiO2 could be destroyed by calcination of template at 450℃.However,V/Ce/F-TiO2 removed template by calcinations has the mesoporous structure,which suggests that the mesoporous structure can be stabilized by the doped ions.Shift of the adsorption edge to visible light was found for the doped mesoprous TiO2.Mesoporous photocatalytic TiO2 films were prepared via a simple method that involves dip-coating of ITO glass into an organic/inorganic sol followed by calcination of the coating at 350℃.By systematically studying the influence of the synthesis parameters such as mass of doped CTAB,the viscosity of sol,aging temperature and aging time,we have established optimal conditions for reproducible synthesis of mesoporous titania films.They were characterized by XRD,SEM, TEMand N2 adsorption-desorption isotherm.The results show that the properties included high surface area(166 m2·g-1) and narrow pore size distribution ranging from2 to 10 nm,active anatase crystal phase and homogeneity without crack in large scale.The thickness of TiO2 layers was uniform at approximately 1.0μm.Using the TiO2/ITO as working electrode characterized by electrochemical analyses,the photoelectrocatalytic system with three kinds of electrodes（Pt as counter electrode and Ag/AgCl as reference electrode） is built.Dye wastewater was one of refractory industrial wastewater,especially methyl orange dye wastewater.We systematically studied important factors influencing the degradation of methyl orange by the photoelectrocatalytic method,such as the bias potential,pH value,quantity of catalyst,initial methyl orange concentration and electrolyte,and founded optimal conditions for degradation of methyl orange.Then we studied different sample under the optimal conditions.The effects of pH,bias potential,initial methyl orange concentration,quantity of catalyst on the photoelectrocatalytic reaction rate of methyl orange were investigated. The global kinetics was described by an exponential equation derived as C=C0 exp(-1.6046C0-0.7169E0.3175Q1.4692t).The calculated result was close to experimental result.

Related Dissertations

  1. Preparation and Photocatalytic Properties for Water Decomposition of Titanate Photocatalyst,O643.36
  2. Preparation of ITO Quai-1D Nanostructures by Sol-Gel Method Combined with Porous Anodic Aluminum Oxide Template,TB383.1
  3. Preparation and Electrocaloric Effect of BaxSr1-xTiO3 Ferroelectric Thin Films,TB383.2
  4. The Study of Preparation and Photocatalytic Activity of TiO2 by Electrospinning,O614.411
  5. First- principles calculations of doped anatase titanium dioxide photocatalytic properties,O643.36
  6. Preparation and Performance of V2O5-WO3/MOx/Cordierite Catalyst Modified with Cu、Mn、Ce for DeNOx,X701
  7. Iron, lanthanum -doped nano TiO \u003csub\u003e 2 \u003c/ sub\u003e Preparation and photocatalytic properties,O614.411
  8. Preparation of Silica Hollow Spheres with Mesopores in the Walls,TB383.1
  9. Fabrications and Applications of Microelectrode Array of Silicon Dioxide Cavities and Magnetic Ferroferric Oxide Nano-Bioconjunctions,TB383.1
  10. Study on Preparation and Properties of Polyimide/SiO2 Hybrid Films,TB383.2
  11. Preparation and Properties of ZnO-based Diluted Magnetic Semiconductors,TN304.21
  12. Investigation into ZnO Thin Film Transistors Prepared by Sol-gel Method,TN321.5
  13. GaAlAs / GaAs photocathode assembly mechanism of material,TN304.2
  14. Titanium-based metal oxide coating preparation and application of the electrodes,X703
  15. Preparation and Physical Properties of Mn and Co-doped SiC Diluted Magnetic Semiconductor Films,TN304.055
  16. Study on the Preparation and Doping Y2O3 of Low-voltage ZnO Varistor Ceramics,TN304.93
  17. Nano- TiO_2 composite photocatalytic oxidation of elemental mercury removal experimental study,X51
  18. Preparation and Application of Complex Oxide Coated Nano-electrode for the Oxidation of Pollutants,X505
  19. One-dimensional Core-shell Structured Multi-walled Carbon Nanotubes/Polyaniline Nanocomposites,TB383.1
  20. Preparation of soluble polyaniline doped with camphor sulfonic acid,O633.21
  21. The Study of Light Absorption Charateristics of Doped Complex Oxide with Perovskite Stucture,O643.36

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile