Dissertation > Excellent graduate degree dissertation topics show

Pd/TiO_2 nanomaterials Preparation , Characterization and study of environmental applications

Author: LiuGuoCong
Tutor: SiShiHui
School: Central South University
Course: Analytical Chemistry
Keywords: MCM-Pd/TiO2 thin film of Pd-TiO2 QCM β-CD-Pd/TiO2 environment contaminations
CLC: TB383.1
Type: Master's thesis
Year: 2005
Downloads: 208
Quote: 0
Read: Download Dissertation

Abstract


In this thesis, environment contaminations,such as formaldehyde, （o,m,p-） omethyphenol and some heavy-metal ions are used as substance for the test of photocatalytical ability of TiO2.The modification of TiO2 with Pd-dopping,the immobilization methods of TiO2 and surface absorption behavior of TiO2 were studied in detail.A modified TiO2 precursor technique was developed for the preparation of TiO2 and Pd/TiO2 loaded on MCM,and Pd/TiO2 particles were characterized by means of SEM,TEM,XRD,UV-Vis,IR and Raman spectroscopy. Controllabe particle size of Pd/TiO2 is from 8.3nm to 25 nm. The experiment results showed that MCM-Pd/TiO2 with a Pd-doping amount of 1% possesed the best photocatalytic activity. methylphenol in concentration of 1×10-4molL-1 could be completely degraded under 40W UV illumination for 3 hours with the air bubbling at 120ml/min. Additionally,the photocatalysts of single or double elements doping were prepared respectively,and their corresponding photocatalytic were investigated.Thin films of TiO2 consisted of different percentage of Pd loaded on a tiny-aperture glass were prepared,and photocatalytic degradation of omethoate pesticides using obtained Pd/TiO2 films was studied.The results showed that photocatalyst calcined at 400℃ for 2.5 hours gave higher activity when the sol containing 15% PEG and l%Pd was used.All omethoate in concentration of 1×10-4molL-1 could be degraded over the catalyst under 40W UV lamp illumination for 5 hours.and the Pd/TiO2 thin film possesses better stability and the long life time,the regeneration of the Pd/TiO2 thin film could be done by washing with 10-2molL-1 NH3 . H2OAbsorption behaviors of Cu2+,Cd2+ and Pb2+ ions on nano-β-CD-TiO2 and β-CD-Pd/TiO2 were studied by QCM.The results showed that absorption amount of modified TiO2 by doping β -CD was enhanced .Absorption model was proposed to describe the absoption process of them. This kind of absorption belongs to A Langmuir,and Γmax for Cu2+,Cd2+ and Pb2+ on β-CD-TiO2 were 1.035×10-4molg-1,1.089× 10-4 molg-1 and 1.091×10-4 molg-1 respectively, but 1.530×10-4molg-1,1.341X lO^molg"1 and 1.273 X lO^molg1 for those ions onJ3-CD-Pd/TiO2 respectively.

Related Dissertations

  1. Detection of Pollutant Gas by the Ionic Liquids Film for Cultural Heritage Preservation,TP212.9
  2. Supramolecular Recognition Mechanism and Its Application Based on Calixarene Coated QCMs,TP212.2
  3. Research of Early Cancer Measuring System Based on ARM Embedded System,TP274.4
  4. Research on the Detection System for Early Tumour Based on ARM,TH789
  5. Studies of New SOI Materials and Relevant Technologies & Applications,TN304.2
  6. Studies on Metallothionein-Imprinted Polymers,O631.3
  7. The Electrochemistry of Self-assembled DNA,O646
  8. Piezoelectric Electrochemistry Studies on Several Biocatalysis and Chemocatalysis Systems,O643.3
  9. The Study of Spacecraft Surface Environment Contamination and Calibration of the Quartz Crystal Microbalance,V476
  10. The preparation and application of efficient photocatalyst nano titanium dioxide,X70
  11. Gold nanoparticles modified thiol self-assembled monolayer electrochemistry and its application interface,TB43
  12. Piezoelectric DNA Sensor Based on Gold Nanoparticle Amplification,TP212.1
  13. Electrochemical Quartz Crystal Impedance Analysis Studies on Glucose Oxidase Electrodes,O657.1
  14. Monolayer-Encapsulated Gold Nanoparticles Used for Electronic Conducting and Sensing Research,O657.1
  15. The Research of DNA Sensor Multiplied and Modified Surface with Gold Nanoparticles,Q7-3
  16. ICA electronic nose signal processing,R318.6
  17. Gold Nanoparticles Amplified QCM Detection of Heavy Metal Ions,O657.1
  18. Dissipation factor QCM and fluorescence quenching dynamic monitoring table epigallocatechin gallate interaction with human saliva,R78
  19. Gas Sensitive Thin Film and Gas Property,TP212
  20. Biosensing Studies Based on Laccase and Its Catalyzed Polymer Syntheses,TP212.3

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile