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International Journal of Photoenergy
Volume 2013 (2013), Article ID 507329, 8 pages
http://dx.doi.org/10.1155/2013/507329
Research Article

Cesium Salt of Sodium 30-Tungstopentaphosphate: An Effective and Green Polyoxometalate for Synthesis of Gold Nanoparticles along with Decoration of Titanium Dioxide with Gold Nanoparticles for Bleaching of Malachite Green

1Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad 91735-413, Iran
2Laboratory of Green Chemistry, Department of Chemistry, Lappeenranta University of Technology, Sammonkatu 12, 50100 Mikkeli, Finland

Received 1 October 2013; Revised 12 November 2013; Accepted 13 November 2013

Academic Editor: Vincenzo Augugliaro

Copyright © 2013 Fatemeh Farrash Bamoharram et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

For the first time, capability of the cesium salt of sodium 30-tungstopentaphosphate, the so-called Preyssler’s anion (CsP5), as a green and eco-friendly polyoxometalate was investigated in the synthesis of gold nanoparticles and decoration of titanium dioxide with gold nanoparticles. Gold nanoparticles and nanocomposites were characterized by TEM, XRD, UV, and FTIR. TEM images showed that the gold nanoparticles have tubular and spherical shapes and particle size ranges from 10 to 25 nm. For gold-decorated titanium dioxide/Preyssler, a comparison between pure and amine-modified titanium dioxide showed higher loading of gold nanoparticles on amine-functionalized titanium dioxide. The performance of CsP5 was compared with its pure acid (HP5). Our findings showed that CsP5, as a catalytic linker to bind onto titanium dioxide surface for reducing gold nanoparticles, renders decoration better than HP5 in both pure and modified titanium dioxide. In addition, efficiency of the photocatalytic bleaching of malachite green by the synthesized nanocomposites was found to be excellent.