Dissertation > Excellent graduate degree dissertation topics show

Preparation and photocatalytic properties of rare earth doped TiO_2 Nano 's

Author: ZhuJian
Tutor: WenLiShi
School: Central South University
Course: Condensed Matter Physics
Keywords: sol-gel photocatalysis rare-earth doping methyl orange chloramine phosphorus
CLC: X132
Type: Master's thesis
Year: 2008
Downloads: 282
Quote: 2
Read: Download Dissertation

Abstract


Improving water pollution treatment is one of the hot spots in environmental protection field. Photocatalytic oxidation method has many advantages such as high activity, stabilization and complete mineralization of undersirable organic contaminants, particularly toxic and unbiodegradable organic compounds. For the moment, this technology is limited in the laboratory level in China.In this thesis La3+, Ce3+ single doped TiO2 and La-Fe, Ce-Fe co-doped TiO2 were prepared by sol-gel method. The structure, shape and spectrum characteristic were characterized by XRD, FE-SEM, EDS, FT-IR and UV-vis. The photocatalytic activities were evaluated by degradation of methyl orange and chloramine phosphorus. At the same time, we investigated the influence of process parameters on the fabrication of doping TiO2. Furthermore, we analyed the reaction kinetic of organics photocatalytic degradation process.The results show that the particle size of the powder is homogeneous, the particle size is varied with the change of doped amount and element. With the annealing temperatures increasing, the particle grown. The particle size of rare-earth doped TiO2 is smaller than pure TiO2, we consider that doping restrain the growth of crystal. The doping with optimum rare-earth could restrain the crystal structure changing. The co-doping with optimum rare-earth and metal can restrain the transform of anatase structure to rutile structure and the growth of crystal more effectively. FT-IR results show that Infrared absorption bands of rare-earth doped TiO2 has been broaden, and characteristic vibration peak of Ti-O is red-shift. UV-vis results show that the absorption sideband of La3+ doped TiO2 has red-shift and widen the spectrum absorption range.The results show that the photocatalytic of TiO2 has been highly improved by rare-earth doping. The optimal doping of La3+ is 0.5mol%, Ce3+ is lmol%, and annealing temperature is 500℃. The co-doping of rare-earth and metal show a synergistic effect for photocatalytic activity of TiO2. The co-doped TiO2 show higher photocatalytic activity in degradation of methyl orange than that of single doped TiO2. Titania co-doped with La-Fe for n（La）:n（TiO2）=0.5%, n（Fe）:n（TiO2）=0.05% have the highest photocatalytic efficiency. In the same condition, organics photocatalytic process is difference. Degradation rate of methyl orange is higher than chloramine phosphorus. Fitting cuve of methyl orange photocatalytic degradation show that the reaction kinetics of rare-earth doped TiO2 is according with the first order reaction equation of Langmuir-hinshelwood. Photocatalytic degradation cure of chloramine phosphorus is fit for conic. The form of equation is Y=A+B1*t+B2*t2.

Related Dissertations

  1. Preparation and Photocatalytic Properties for Water Decomposition of Titanate Photocatalyst,O643.36
  2. Preparation and Electrocaloric Effect of BaxSr1-xTiO3 Ferroelectric Thin Films,TB383.2
  3. Iron, lanthanum -doped nano TiO \u003csub\u003e 2 \u003c/ sub\u003e Preparation and photocatalytic properties,O614.411
  4. Preparation of TiO2 Microspheres and the Study of Their Properties,O614.411
  5. Preparation and Photocatalytic Study of Surface Modification of ZnS Nano-materials,TB383.1
  6. The Preparation, Microstructure and Propertities of the New Type 3D-Meshy SiC/Cu-Fe Composite Material,TB33
  7. Preparation and Properties of Zinc Oxide and Aluminum Doped Zinc Oxide Thin Films,O484.1
  8. Preparation and Modification of Spinel LiMn2O4 Cathode Materials for Lithium Ion Battery,TM912
  9. Magnetically Separable P25/ZnFe2O4 Composite: Preparation and Photocatalytic Properties,TQ426.94
  10. Preparation and Microstructure of Er2O3 Tritium Permeation Barrier,TG174.4
  11. Preparation and Characterization of ABO3-type Perovskite Oxides,TB383.1
  12. Synthsis and Properties of Waterborne Polyurethane Hybridized with Nanosilica and Siloxane by Sol-gel Process,TB383.1
  13. Preparation of silica airgel , Characterization and Properties,TQ127.2
  14. Study on Sol-gel Preparation and Photocatalytic Activity of Titanium Dioxide Potocatalyst,O643.36
  15. Preparation and Photocatalysis Property of TiO2/ACF Photocatalytic Material,O643.36
  16. Lithium- ion battery cathode material lithium iron phosphate synthesis and modification,TM912
  17. Cone octahedral Fe 3 O 4 and hexagonal platelets Ba (Me) x Co 2-2x Fe 16 O 27 microwave absorption properties,TM25
  18. W-type hexagonal ferrite preparation and absorbing properties of,TM277
  19. Synthesis of Mn-Zn Ferrite by Sol-Gel Auto-Combustion Method and the Study on Properties,TM277
  20. Stuy of TiO2 Powder and Films Prepared by Sol-Gel Method,TB383.3
  21. Hydroxyapatite modified and photocatalytic degradation of dye performance study,X703

CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Chemistry > Environmental Analytical Chemistry
© 2012 www.DissertationTopic.Net  Mobile