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Photocatalytic degradation of methylene blue by TiO2-capped ZnO nanoparticles

Simchi, A ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: 2008
  3. Abstract:
  4. ZnO nanoparticles were fabricated via hydrothermal method and an amorphous TiO2 layer was then coated on the nanoparticles via sol-gel route. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that the synthesized ZnO nanoparticles were hexagonal with wurtzite structure and an average particle size of 38 nm. The thickness of the titanium oxide layer was determined to be 20-40 nm. The photocatalytic decolorization of Methylene blue under UV irradiation indicated that as-prepared TiO 2-capped ZnO is inferior than ZnO particles. Nevertheless, calcinations of the particles at 350 °C for 24 h significantly improved the photo-activity of the ZnO/TiO2 core/shell structure. Here, the photo-activity was superior to that of ZnO and TiO2 (P-25, Degussa) nanoparticles
  5. Keywords:
  6. Amorphous TiO ; Average particle size ; Core/shell structure ; Degussa ; Hydrothermal methods ; Methylene Blue ; Photo catalytic degradation ; Photocatalytic decolorization ; Sol-gel routes ; TiO ; Titanium oxide layer ; Transmission electron microscopy tem ; UV irradiation ; Wurtzite structure ; ZnO ; ZnO nanoparticles ; ZnO particles ; ZnO/TiO ; Aromatic compounds ; Ceramic materials ; Metal nanoparticles ; Photodegradation ; Sol-gel process ; Titanium ; Titanium dioxide ; Transmission electron microscopy ; X ray diffraction ; Zinc oxide ; Zinc sulfide ; Synthesis (chemical)
  7. Source: 2nd International Congress on Ceramics, ICC 2008, Verona, 29 June 2008 through 4 July 2008 ; 2008 ; 9788880800842 (ISBN)