Dissertation > Excellent graduate degree dissertation topics show

Preparation and Performance Investigation of Surface-Modified Titanium Dioxide Photocatalysts

Author: WangYuNing
Tutor: ChenJieSheng; LiGuoDong
School: Jilin University
Course: Inorganic Chemistry
Keywords: Titanium dioxide photocatalysis surface madification porous structure composite photocatalyst
CLC: O614.411
Type: Master's thesis
Year: 2012
Downloads: 104
Quote: 0
Read: Download Dissertation

Abstract


With the increasing concern over global environmental pollution and energy crisis,photocatalysis technique provides a new, hopeful approach to solve the two major problemsthrough efficient utilization of solar energy. In1972, Fujishima and Honda discovered thephenomenon of photocatalytic splitting of water on a TiO2electrode under ultraviolet light.This is a groundbreaking work in the field of chemical conversion of solar energy. Since then,TiO2photocatalyst becomes a hot research topic, and has been considered to be the mostpromising photocatalytic material. Although TiO2has many advantages such as chemicalstability, non-toxicity, and high photocatalytic activity under UV light, the widespread use ofTiO2material is limited by its wide bandgap energy, which causes the catalyst to exploit onlya very small proportion （about35%） of solar radiation. Therefore, it is highly desired todevelop strategies of shifting the photo-responsive range of TiO2to visible spectral region.This thesis focuses on the surface-modification strategy to extend the photo-responsiverange of TiO2with the aim of achievement of visible light photocatalysis. Firstly, porous TiO2was selected as host material for surface modification. This host TiO2material with a largesurface area and anatase structure was prepared by a light-induced approach. Its structuralperformance was optimized by various characterizations such as XRD and N2adsorption.Furthermore, the optimal host material was modified by various metal ions. It is concludedthat iron-ions modification results in the formation of additional surface energy levels in TiO2,extending the photo-responsive range. By means of surface photovoltage spectroscopy （SPS）, transient photovoltage （TPV） and EPR techniques, we investigated the effects of surfacemodification on interfacial electron transfer. Using the photocatalytic degradation ofmethylene blue （MB） as model reaction, we studied the visible light photocatalyticperformances of the materials. The photocatalytic results show that simple surfacemodification in indeed achieves the ultimate goal of visible-light-driven photocatalysis, andthe photocatalytic erformance of iron-modified TiO2is superior to that of nitrogen-dopedTiO2.Secondly，we present a novel in situ reduction strategy to modify porous TiO2by noblemetal nanoparticles. By using light-induced synthetic route, we successfully prepared aporous TiO2material with a large number of surface Ti3+species. Due to the high reducibilityof Ti3+, metal ions can be directly reduced to metal nanoparticles on the surface of porousTiO2, leading to the formation of a composite material. Interestingly, we found that a largenumber of H2gas released during the process of surface modification. A preliminarymechanism on this phenomenon was provided. Further works on the catalytic application ofthe porous TiO2/metal nanoparticles are under investigation.

Related Dissertations

  1. The Preparation and Research of Magnetically Separable TiO2 Photocatalyst Nanofibers,TB383.1
  2. Studies on Synthesis, Characterization and Properties of Fe-V Co-doped TiO2 Catalyst,O614.411
  3. The Study of Preparation and Photocatalytic Activity of TiO2 by Electrospinning,O614.411
  4. First- principles calculations of doped anatase titanium dioxide photocatalytic properties,O643.36
  5. Characterization and mechanism of the titanium dioxide surface envelope,TQ621.12
  6. Iron, lanthanum -doped nano TiO \u003csub\u003e 2 \u003c/ sub\u003e Preparation and photocatalytic properties,O614.411
  7. Study on Modification of ZnO-TiO2 Composite Catalyst and Its Photocatalytic,X703
  8. Modification and its impact on TiO 2 surface photovoltaic properties of the mechanism,O614.411
  9. Preparation of Metal @ TiO2 Core @ Shell Nanoparticles and SERS Research,TB383.1
  10. Preparation and Photocatalytic Properties of Rare Earth Doped TiO2 and ZnWO4 with Different Morphologies,O643.36
  11. The Photocatalytic Degradation of Nitro-phenol by B-N-Er-TiO2 and F-N-Er-TiO2 Nanocrystal under Visible Light,O643.32
  12. Preraration and Properties of Carbon Nanofibers and Their Composites,TB383.1
  13. Modification of Iodine Doped Titanium Dioxide for the Photodegradation of 2-chlorophenol,O643.32
  14. Visible oxide catalyst with high activity and mechanism of Design and Synthesis,O643.36
  15. Study on Functional Optimization of the Photocatalyst Fiber with Honeycomb-like Porous Structure and Its Fabric,TS106
  16. Synthesis Rare-earth Iron-based Oxide Nanoparticles for Visible Light Degradation of Rhodamine B,X703
  17. Preparation of Nanovoid Core（Tio2 ）/shell（SiO2 ） Phase-boundary Photocatalyst and Its Specific Interface Adsorption Property,O643.36
  18. Facile Synthesis of Cuprous Oxide Nanocomposites and Photocatalytic Properties,O643.36
  19. Porous Polyoxometalate Compounds Directed by Templates,O611.3
  20. Immobilized nano- TiO 2 situ preparation and photocatalytic properties of,O643.36
  21. Preparation and Characterization of Nano-sized TiO2 Powder and Ceramics,TB383.1

CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section Ⅳ group metal elements and their compounds > The titanium Vice family ( IV B group metal elements) > Ti Ti
© 2012 www.DissertationTopic.Net  Mobile