Dissertation > Excellent graduate degree dissertation topics show

Nano- TiO_2 composite photocatalytic oxidation of elemental mercury removal experimental study

Author: YangShan
Tutor: ZhangJunYing;ZhengChuGuang
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Nano-TiO2 composite Elemental mercury Sol-gel method Photocatalytic Oxidation
CLC: X51
Type: Master's thesis
Year: 2009
Downloads: 52
Quote: 0
Read: Download Dissertation

Abstract


Mercury is a toxic biological deposition of heavy metals, due to the current structure of the world's energy is strongly dependent on coal, resulting in atmospheric emissions of mercury chronically high on the ecological environment and human health caused great harm. This article looks at the development of new photocatalysts adsorbent TiO 2 - Activated carbon (TiO 2 -AC) and TiO 2 - aluminum silicate fiber ( TiO 2 -fiber) two types of complexes, and apply it to the flue gas mercury emission control study. In this study, sol-gel method with activated carbon and aluminum silicate fiber cloth as the carrier through different sol ratio and heat treatment temperature synthesis of a variety of different compounds. Using X-ray diffraction (XRD) characterized by means of its; for analog mercury gas, ultraviolet light at a wavelength of 253.7nm (UV) irradiation using a variety of complex conditions test photocatalytic removal of mercury to verify the performance of photocatalytic removal of mercury; and after removal of mercury adsorbent mercury speciation testing, inspection forms catalytic effect of mercury. Finally, the reaction mechanism and kinetic equations to simulate the test results. Characterization results show that using the sol-gel method successfully nano-TiO 2 particles supported on the support surface, the particle size can be controlled in 10 3 0nm; 500 ℃ heat treatment complexes TiO 2 anatase form, anatase to rutile transition temperature of 500 7 00 ℃ between. Photocatalytic mercury removal tests showed anatase composites with strong catalytic activity; fiber-based composites with carbon-based mercury removal performance is quite, reached 86%, but the fiber is more suitable as TiO 2 < / sub> carrier; sol mole ratio of 2/1, the catalytic activity of the most complex, the removal rate reached 95%. 5% of the simulated flue gas O2 concentration of mercury can fully meet the catalytic removal reactions, increasing the amount of O2 does not affect the removal of mercury; at 1.3 2 .5% increase in the water vapor content on the removal of mercury First demonstrated role in promoting optimum at 2.0% mercury removal performance, continue to increase mercury removal had no significant effect; at 2.0 3 .3 mW / cm 2 within , mercury removal rate increased with the enhancement of the UV intensity increases, while in 3.3 4 . 8mW / cm 2 removal of mercury within the catalytic rate does not vary with UV and change; Control reaction temperature, 30 7 0 ℃, the mercury removal rate with no significant change in temperature, while in 70 1 00 ℃ temperature rise inside the light will inhibit Catalytic removal of mercury. Mercury speciation testing and validation of the catalytic removal of mercury test results, after removal of mercury catalysts HgO ratio were 83%, intuitive proof of mercury oxidation; 5% O2 concentration under the conditions of the catalytic reaction was adequate, its elevated concentration had no effect on the oxidation; the water vapor concentration increased to 2.0%, HgO content of maximum 87%, continue to increase the quantity of water vapor, would hinder the catalytic reaction. Photocatalytic oxidation reaction rate above 84%, the oxidation effect is obvious. Kinetic equation fitting results show photocatalytic reaction is a reaction of mercury removal.

Related Dissertations

  1. Sol - gel method p -type ZnO films,O484.1
  2. Study on the Structure and Magnetic Properties of K-doped SnO2 and V-doped ZnO Diluted Magnetic Semiconductor Powders,TB383.1
  3. Fabrication and Microwave Absorbing Properties of BaFe12-x (Ni (0.5)Cu0.5Zr)x/2O19 Ferrite,TM277
  4. Preparation and Properties of Li4Ti5O12 as Anode Material of Lithium-Ion Batteries,TM912
  5. Research on Synthesis and Modification of Li3V2(PO43 as Lithium-ion Battery Cathode Material,TM912
  6. Fabrication and Magnetic Properties of Mn-Zn Ferrites,TM277
  7. The Basic Research of Properties of All-ceramic Restoration Bonded by Resin Cement and Color Properties of the Resin,R783.1
  8. The Fabrication, Structure and Properties of SnO2/Sn/C Composites Anode Materials for Lithium Ion Batteries,TM912
  9. Effect of Seed Layer on Microstructure and Porperties of BiFeO3 Thin Film,TB383.2
  10. Preparation and Properties of lithium-ion battery anode material Li_4Ti_5O_ (12),TM912
  11. Lithium- ion battery cathode material LiFePO_4 Preparation and Properties,TM912
  12. Research on Removal of Fluorine Ion from Wastewater by Nano-Hydroxyapatite,X703
  13. Storage-stable organic / inorganic hybrid polymers and their light-cured coating application,TQ630.4
  14. Bismuth Thin Films Prepared by Sol-Gel Method and Their Photocatalytic Property,O643.36
  15. Study on Preparation and Catalytic Behaviors for Isobutene Selective Oxidation of MoPO and VPO Catalysts,TQ221.21
  16. Preparation and Properties of Organic-Inorganic Hybrid Anticorrosion Coatings on Metal Surface,TG174.4
  17. Photoluminescence Character and Thermal Application of Rare Earth (Dy, Nd, Yb, Er) Co-doped Al2O3,O482.31
  18. Study on the Low Temperature Synthesis of Zircon Powder by Non-Hydrolytic Sol-Gel,TB383.3
  19. Technical Study on the Preparation of Aluminum Titanate Film by Sol-Gel Method,TB383.2
  20. Preparation and Characterization of SnO2:Sb Films Coated on the Glass Substrates with TiO2 Film by Sol-Gel Method,TB383.2

CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control
© 2012 www.DissertationTopic.Net  Mobile