Dissertation > Excellent graduate degree dissertation topics show

Templatesynthesis of Fe3+、Zn2+、Sn4+-doped TiO2 Hollow Fibers and Their Photocatalytic Properties

Author: SunJiaXing
Tutor: SuBiTao
School: Northwest Normal University
Course: Physical and chemical
Keywords: TiO2 Fe3, Zn2, Sn4 ion doping Hollow fiber Template Preparation Characterization Photocatalytic Performance
CLC: O614.411
Type: Master's thesis
Year: 2010
Downloads: 86
Quote: 0
Read: Download Dissertation

Abstract


TiO 2 photocatalyst air purifying sewage and the application of more and more attention. But because of its wide band (3.2 eV), can be less than 380 nm wavelength UV excitation. And said light energy band energy in the sunlight only about 3-5%. Coupled with nano-TiO 2 exists as a photocatalyst powder recycling difficult, difficult issues such secondary use. Therefore, in order to more effectively utilize the sun's visible light energy, the development of visible light responsive, high-performance, easy recovery of TiO 2 photocatalyst is very necessary. Therefore, the present study using natural cotton fibers as a template for TiO 2 for metal ion doping modification, prepared a series of metal ions doped with semiconductor photocatalysts hollow fiber structure material . This thesis consists of the following three aspects: 1. Using cotton fibers as a template successfully synthesized Fe 3 -doped Fe 3 / TiO 2 < / sub> hollow nanofiber photocatalytic materials. Methylene blue (MB) of bleaching degradation as a model reaction was investigated Fe 3 doping amount, calcination temperature and calcination time, amount of catalyst on its catalytic performance. The results show that using the template prepared Fe 3 / TiO 2 hollow fiber structural material surface of a large nanoparticles (average size of about 12 nm) exist; Fe 3 may be uniformly dispersed in the anatase TiO 2 , the partial substitution of Ti 4 of lattice sites, not only broadens the TiO 2 spectral response range, and the formation of TiO 2 crystal structure defects, so that the surface charge negative charge. Sunlight conditions, the fibrous structural material than pure TiO 2 the MB solution has better photocatalytic decolorization degradation and Fe 3 of incorporation significantly affected The catalytic properties of the fiber material; when Fe 3 doping amount of 0.15% calcined at 500 oC 2 h resulting hollow fiber material best catalytic performance, 2 h to degrade the MB decoloration 93%; still be reused five times the decoloration MB degradation rate remained at 90%, and centrifugal separation of the catalyst material is easy to remove. Therefore, the template synthesis method, by Fe 3 doping is expected to make TiO 2 to become a non-energy, high catalytic activity of green materials. (2) using cotton fibers as a template successfully synthesized Zn 2 / TiO 2 hollow nanofiber photocatalytic materials. Methylene blue (MB) of bleaching degradation as a model reaction was investigated Zn 2 doping amount, calcination temperature and calcination time, amount of catalyst and concentration of its photocatalytic performance. The experimental results showed that: the lower the amount of Zn 2 doping could inhibit TiO 2 from anatase to rutile phase transition; Zeta potential values ??of the sample size is not affected light the main reason for the catalytic performance. Optimum catalytic reaction conditions, Zn 2 doping amount of 0.7% catalyst calcination temperature 600 oC, the calcination time is 2 h, catalyst dosage of 40 mg, a concentration of m (Zn 2 : TiO 2 ) = 0.0055 g: 0.2348 g. Under optimum conditions, the sunlight illumination 5 h, MB degradation rate can reach 100%. 3 using cotton fibers as a template successfully synthesized Sn 4 / TiO 2 hollow nanofiber photocatalytic materials. Methylene blue (MB) of bleaching degradation as a model reaction was investigated Sn 4 doping amount, calcination temperature and calcination time and the amount of catalyst on catalytic performance. XRD showed that: at low doping under, Sn 4 doped TiO 2 phase transition temperature have little effect. UV-Vis spectra showed that: Sn 4 / TiO 2 hollow nanofiber samples than pure TiO 2 hollow nanofibers at 200-800 nm UV - the visible light range has greater absorption, and the absorption edge, a red shift occurs. Using templates prepared Sn 4 / TiO 2 hollow fiber photocatalysts the MB has good photocatalytic effect. Optimum reaction conditions, Sn 4 doping amount is 0.3%, the catalyst calcination temperature 600 oC, calcination time is 2 h, catalyst dosage 40 mg. Under optimum conditions, the sunlight illumination 3 h, MB degradation rate can reach 100%.

Related Dissertations

  1. Studies on the Synthesis and Technology of Dipentaerythritol and Its Derivative,TQ223.164
  2. Preparation of Based on the Phenolic Resin of Activated Carbon and Adsorption-Photopcatalytical Character of Supported TiO2,TQ424.19
  3. Preparation of ITO Quai-1D Nanostructures by Sol-Gel Method Combined with Porous Anodic Aluminum Oxide Template,TB383.1
  4. Study on the Synthesis Bi3.25La0.75Ti3O12（BLT） Nanotubes and Nano Wires,TB383.1
  5. Hydrothermal Synthesis of Oxide Hollow Spheres,TB383.4
  6. The convergence of mathematics teaching in primary and secondary schools under the new curriculum with the problem representation,G633.6
  7. Research on Algorithms of 2D Face Template Protection,TP391.41
  8. Phosphorus pentoxide composite ammoniated condensing agent preparation of ammonium polyphosphate,TQ314.248
  9. Research on Secure Fingerprint Authentication Based on Distance Projection Coding,TP391.4
  10. The Preparation and Research of Magnetically Separable TiO2 Photocatalyst Nanofibers,TB383.1
  11. Studies on Synthesis, Characterization and Properties of Fe-V Co-doped TiO2 Catalyst,O614.411
  12. Preparation and Properties of Highly Active Dietary Fiber and Carboxymethylcellulose from Gracilaria Residue,TS254.9
  13. The Study of Preparation and Photocatalytic Activity of TiO2 by Electrospinning,O614.411
  14. Characterization of Corn Lectin and Application to Screen of Growth-promoting Bacteria from Corn Rhizosphere,S513
  15. Of Bi N Co-doped TiO \u003csub\u003e 2 \u003c/ sub\u003e of the preparation and performance,O614.411
  16. Improvement of Preparation Technology for Chitin and Chitosan from By-product of Litopenaeus Vannamei,TS254.9
  17. Health-based and Ecological Risk Assessment of Contaminated Sites,X820.4
  18. Preliminary Research on Characterization of Thermophilic Protease Pasey and Helicase Htc16,Q814
  19. Cloning and Expression of Xylanase Gene from Thermobifida Halotolerans YIM 90462~T,Q78
  20. Investigation of Fabrication, Characterization and Property of Fuctional Titanium Dioxide Nanoporous Materials,TB383.1
  21. Investigation of Preparation and Properties of Ordered Porous TiO2,TB383.2

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