Plasmon resonance enhanced photocatalysis under visible light with Au/Cu-TiO2 nanoparticles: Removal Cr (VI) from water as a case of study

M. A. Gondal, M. A. Dastageer, S. G. Rashid, S. M. Zubair, M. A. Ali, D. H. Anjum, J. H. Lienhard, G. H. McKinley, K. Varanasi

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Abstract

Gold modified copper doped titania (Au/Cu:TiO2) nanoparticles were synthesized by a modified sol gel method and characterized using XRD, optical and TEM based techniques. The as-prepared material contained anatase phase particles with quasi-spherical morphology, showing enhanced absorption in the visible region and low photoluminescence emission intensity. Photocatalytic reduction of Cr (VI) in aqueous suspension with the Au/Cu:TiO2catalyst under 532 nm laser radiation and a visible broad band lamp source yielded 96% and 45% removal, respectively, without any additives. The enhanced photocatalytic activity can be attributed to the improved plasmonic effect due to gold modification and the expanded visible absorption due to copper doping. Moreover a comparative study of the material properties and catalytic activity of TiO2, Cu-TiO2and Au/Cu-TiO2 was carried out.

Original languageBritish English
Pages (from-to)2007-2014
Number of pages8
JournalScience of Advanced Materials
Volume5
Issue number12
DOIs
StatePublished - Dec 2013

Keywords

  • Au/Cu-TiO nanocomposite
  • Heterogeneous catalysis
  • Plasmonic metals
  • Visible light active catalyst
  • Waste water treatment using solar radiations

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