Microwave-induced fast crystallization of amorphous hierarchical anatase microspheres

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• 作者：David G Calatayud (6)
  Teresa Jardiel (6)
  Marco Peiteado (7)
  Amador C Caballero (6)
  Daniel Fern谩ndez-Hevia (8) (9)
  
  6. Instituto de Cer谩mica y Vidrio ; CSIC ; c/Kelsen 5 ; Campus de Cantoblanco ; Madrid ; 28049 ; Spain
  7. POEMMA-CEMDATIC ; ETSI Telecomunicaci贸n ; (UPM) ; Av. Complutense 30 ; Madrid ; 28040 ; Spain
  8. Department of Chemistry ; Group of Photocatalysis and Spectroscopy Applied to the Environment (FEAM) ; Universidad de Las Palmas de Gran Canaria ; Campus de Tafira ; Gran Canaria ; 35017 ; Spain
  9. INAEL Electrical Systems ; S.A. c/Jarama 5 ; Toledo ; 45007 ; Spain
  
• 关键词：TiO2 anatase ; Microwave heating ; Nanoparticles ; Hierarchical microspheres ; Photocatalysis
• 刊名：Nanoscale Research Letters
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：9
• 期：1
• 全文大小：322 KB
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• 刊物主题：Nanotechnology; Nanotechnology and Microengineering; Nanoscale Science and Technology; Nanochemistry; Molecular Medicine;
• 出版者：Springer US
• ISSN：1556-276X

文摘

The fabrication of hierarchical anatase microspheres with potential photocatalytic properties eventually comprises a consolidation step in which a high degree of crystalline order is typically achieved through conventional electric heating treatments. This however entails a substantial reduction in the specific surface area and porosity of the powders, with the consequent deterioration in their photocatalytic response. Here, we have tested the employ of microwave heating as an alternative energy-saving sintering method to promote fast crystallization. The results obtained suggest that under the microwave radiation, the TiO2 hierarchical structures can effectively crystallize in a drastically reduced heating time, allowing the specific surface area and the porosity to be kept in the high values required for an improved photocatalytic performance.