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Ren Su

Promotion of Phenol Photodecomposition over TiO2 Using Au, Pd, and AuPd Nanoparticles

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  • Ren Su
  • Ramchandra Tiruvalam, Department of Materials Science and Engineering, Lehigh University
  • ,
  • Qian He, Department of Materials Science and Engineering, Lehigh University
  • ,
  • Nikolaos Dimitratos, Cardiff Catalysis Institute, School of Chemistry, Cardiff University
  • ,
  • Lokesh Kesavan, Cardiff Catalysis Institute, School of Chemistry, Cardiff University
  • ,
  • Ceri Hammond, Cardiff Catalysis Institute, School of Chemistry, Cardiff University
  • ,
  • Jose Antonio Lopez-Sanchez, Cardiff Catalysis Institute, School of Chemistry, Cardiff University
  • ,
  • Ralf Bechstein, Denmark
  • Christopher Kiely, Department of Materials Science and Engineering, Lehigh University
  • ,
  • Graham Hutchings, Cardiff Catalysis Institute, School of Chemistry, Cardiff University
  • ,
  • Flemming Besenbacher
Noble metal nanoparticles (Au, Pd, AuPd alloys) with a narrow size distribution supported on nanocrystalline TiO2 (M/TiO2) have been synthesized via a sol-immobilization route. The effect of metal identity and size on the photocatalytic performance of M/TiO2 has been systematically investigated using phenol as a probe molecule. A different phenol degradation pathway was observed when using M/TiO2 catalysts as compared to pristine TiO2.We propose a mechanism to illustrate how the noble metal nanoparticles enhance the efficiency of phenol decomposition based on photoreduction of p-benzoquinone under anaerobic conditions. Our results suggest that the metal nanoparticles not only play a role in capturing photogenerated electrons, but are strongly involved in the photocatalytic reaction mechanism. The analysis of the reaction intermediates allows us to conclude that on M/TiO2 undesired redox reactions that consume photogenerated radicals are effectively suppressed. The analysis of the final products shows that the reusability performance of the catalyst is largely dependent on the pretreatment of the catalyst and the identity of the metal nanoparticle. Interestingly, the as-prepared Pd and AuPd decorated TiO2 materials exhibit excellent long-term photoactivity, in which ∼90% of the phenol can be fully decomposed to CO2 in each cycle.
Original languageEnglish
JournalA C S Nano
Volume6
Issue7
Pages (from-to)6284-6292
Number of pages9
ISSN1936-0851
DOIs
Publication statusPublished - 4 Jun 2012

    Research areas

  • photocatalysis, TiO2, Au, Pd, AuPd alloys, phenol decomposition mechanism, reusability, CO2 conversion

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