Dissertation > Excellent graduate degree dissertation topics show

Preparation of Mesoporous TiO2Composite Photocatalyst and Photocatalytic Activity of Dye Waste Water

Author: ZhaoHuan
Tutor: GuanWeiSheng
School: Chang'an University
Course: Municipal Engineering
Keywords: mesoporous TiO2 composite photocatalyst photocatalysis dye wastewater co-doping
CLC: X703
Type: Master's thesis
Year: 2013
Downloads: 53
Quote: 0
Read: Download Dissertation

Abstract


TiO2as a catalyst with excellent photocatalysis performance is widely used in the field ofenvironmental protection. It has characteristics of innocuity, high catalytic activity, highoxidation capability, good stability, corrosion resistance, easy preparation and use. In recentyears, the proportion of dye wastewater in water environmental hazards has increased and it ismore difficult to degrade. Therefore, researching the new and high catalytic activityTiO2-based photocatalyst, discussing its photocatalytic activity under visible light and findingthe reaction mechanism have been got more and more attention. Not only it is for theprotection of the safety to human life, but also it used to reduce the organic pollution has veryimportant significance.In this dissertation, mesoporous TiO2composite photocatalyst and the composites withFe doping, N doping and Fe-N co-doping had been prepared by sol-gel method. A series ofcomposites were characterized by scanning electron microscope techniques （SEM）, X-raydiffraction （XRD），Fourier transform infrared spectroscopy（FT-IR）, etc. The photocatalyticactivities of composites and the influencing factors were evaluated by the photocatalyticdegradation of methylene blue. Some results are as follows.（1） Mesoporous silica SBA-15as a carrier of catalyst was selected and the mesoporous TiO2composite photocatalyst had been prepared by sol-gel method. The experimental resultsshowed that the mesoporous TiO2composite material of1.0g SBA-15and calciningtemperature at750℃had higher photocatalytic activity, good recycling and stablemesoporous structure. XRD results showed that TiO2/1.0gSBA-15-750℃was a mixedcrystal of anatase and rutile.（2） The optimal experiment to choose the best of doping dosage and calcination temperature,the composites with Fe doping, N doping and Fe-N co-doping had been prepared by sol-gelmethod. The results of characterization and photochemical catalysis experiment showed thation doped TiO2could improved the photocatalytic activity of the composites. Especially, thephotocatalytic activity of mesoporous TiO2composite photocatalyst with4.0%Fe-0.5%Nco-doping was the best. The degradation rate of methylene blue was95%. Compared undopedTiO2/SBA-15photocatalyst， the photocatalytic activity of4.0%Fe-0.5%N co-doping photocatalyst increased by17.58%.（3） The one-order reaction of photocatalytic decomposing methylene blue with compositephotocatalyst have been builded. The results showed that the reaction kinetics of degradationmethylene blue were described as one-order reaction and R2were greater than0.97. Inaddition，The reaction rate constant（K） of composites with ion doped was higher thanundoped TiO2/SBA-15photocatalyst, and the reaction rate constant（K） of composites withFe-N co-doping was the highest as0.023min-1.（4） To decompose methylene blue as the goal，the photocatalytic influence factors of solutioninitial concentration and pH had been researched. The experimental results showed that thedegradation rate of methylene blue had an obvious improvement in the acidic conditions whenfrom pH=2to pH=4. However，composite materials had a very high adsorption capacity at thealkaline conditions and the adsorption degradation rate of methylene blue could reach morethan80%. With the initial concentration of methylene blue increased gradually from5mg/L to25mg/L, the photocatalytic degradation rate of methylene blue decreased from99.9%to89.9%.（5） Discuss the mechanism of the photoeatalysis degradation of methylene blue by usingmes-oporous TiO2composite photocatalyst with Fe-N co-doping. The reason that ion dopingmakes band gap of the composite materials decreases may be due to the formation of a newimpurity band. UV-Vis results showed that the response range of composite photocatalystextended from400nm to600nm. Moreover，combined with the data of Vis-UV Spectroscopycould find that the absorption peak at662nm disappeared after the120min photocatalyticreaction. The result showed that methylene blue solution was degraded completely.These results may be helpful to design and construct mesoporous TiO2photocatalystwhich is used to decompose dye wastewater with high activity. These researches providevaluable information for the optimization of TiO2photocatalyst and discussion on thephotocatalytic degradation mechanism. For the further research on the treatment of dyewastewater offered new idea and scientific information.

Related Dissertations

  1. The Preparation and Research of Magnetically Separable TiO2 Photocatalyst Nanofibers,TB383.1
  2. The Study of Preparation and Photocatalytic Activity of TiO2 by Electrospinning,O614.411
  3. First- principles calculations of doped anatase titanium dioxide photocatalytic properties,O643.36
  4. Investigation of Fabrication, Characterization and Property of Fuctional Titanium Dioxide Nanoporous Materials,TB383.1
  5. Photodegradation of Orange Ⅱ by Mesoporous TiO2,X791
  6. Iron, lanthanum -doped nano TiO \u003csub\u003e 2 \u003c/ sub\u003e Preparation and photocatalytic properties,O614.411
  7. Resin D072 load ferrous ion dye wastewater treatment,X703
  8. Study on Modification of ZnO-TiO2 Composite Catalyst and Its Photocatalytic,X703
  9. Modification and its impact on TiO 2 surface photovoltaic properties of the mechanism,O614.411
  10. Preparation of Metal @ TiO2 Core @ Shell Nanoparticles and SERS Research,TB383.1
  11. Preparation and Photocatalytic Properties of Rare Earth Doped TiO2 and ZnWO4 with Different Morphologies,O643.36
  12. The Photocatalytic Degradation of Nitro-phenol by B-N-Er-TiO2 and F-N-Er-TiO2 Nanocrystal under Visible Light,O643.32
  13. Preraration and Properties of Carbon Nanofibers and Their Composites,TB383.1
  14. Modification of Iodine Doped Titanium Dioxide for the Photodegradation of 2-chlorophenol,O643.32
  15. Visible oxide catalyst with high activity and mechanism of Design and Synthesis,O643.36
  16. Preparation of Nanovoid Core（Tio2 ）/shell（SiO2 ） Phase-boundary Photocatalyst and Its Specific Interface Adsorption Property,O643.36
  17. Facile Synthesis of Cuprous Oxide Nanocomposites and Photocatalytic Properties,O643.36
  18. Study on the Photoluminescence Properties of the Rare Earth Doped Oxide Phosphors Prepared by Hydrothermal Method,TQ422
  19. Preparation and Characterization of Nano-sized TiO2 Powder and Ceramics,TB383.1
  20. Wet Chemical Preparation of 1-D β-FeOOH Nanorods and Nanorod Arrays as Well as Their Photocatalytic Property,TB383.1
  21. The development and performance of photocatalytic bamboo fiber knitted fabrics,TS186

CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
© 2012 www.DissertationTopic.Net  Mobile