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Porous Au - TiO2 aerogels nanoarchitectures for photodegradation processes

A. PETER1, L. BAIA2, M. BAIA2, E. INDREA3, F. TODERAS4, V. DANCIU5, V. COSOVEANU5, L DIAMANDESCU6

Affiliation

  1. North University, Faculty of Science, Victoriei 76A, 430083, Baia-Mare, Romania
  2. Babes-Bolyai University, Faculty of Physics 400084, Cluj-Napoca, Romania
  3. National Institute for Research and Development of Isotopic and Molecular Technologies, Donath 71 – 103, RO-400293, Cluj-Napoca, Romania
  4. Institute for Interdisciplinary Experimental Research, Babes-Bolyai University, Treboniu Laurian 34, 400271, ClujNapoca, Romania
  5. Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, Arany Janos 11, 400028, Cluj-Napoca, Romania
  6. National Institute of Material Physics, P.O. Box MG-7, 77125 Bucharest, Romania

Abstract

Porous nanoarchitectures based on TiO2 aerogel and colloidal gold particles have been obtained by different synthesis routes: impregnation of TiO2 aerogel with Au colloid, impregnation of TiO2 gel with Au colloid and preparation of TiO2 gel in the presence of Au colloid. The as prepared composites have been thermal treated at 5000 C and their structural and morphological properties were investigated. The Raman spectra and XRD data demonstrated the anatase structure of the composite obtained by impregnation of TiO2 aerogel with Au colloid and the mixed anatase-brookite structure of those obtained by impregnation of TiO2 gel with Au colloid and by preparation of TiO2 gel in the presence of Au colloid, respectively. TEM analyses suggest that the Au particles on the TiO2 surface as individual particles, as well as clusters are present. The photocatalytic performances of the synthesized composites were tested in the salicylic acid photodecomposition process and it was found that they are strongly influenced by both anatase - brookite TiO2 structure and Au nanoparticles dispersion on the TiO2 surface..

Keywords

Au / TiO2 composites, sol-gel method, Raman spectroscopy, TEM, photocatalysis, salicylic acid..

Submitted at: March 1, 2010
Accepted at: May 26, 2010

Citation

A. PETER, L. BAIA, M. BAIA, E. INDREA, F. TODERAS, V. DANCIU, V. COSOVEANU, L DIAMANDESCU, Porous Au - TiO2 aerogels nanoarchitectures for photodegradation processes, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 5, pp. 1071-1077 (2010)