Mapping the Photocatalytic Activity and Ecotoxicology of Au, Pt/TiO2 Composite Photocatalysts

Boglárka Hampel, Gábor Kovács, Zsolt Czekes, K. Hernádi, Virginia Danciu, Ovidiu Ersen, Maria Girleanu, Monica Focşan, Lucian Baia, Zsolt Pap

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In the present research gold and platinum nanoparticles were deposited simultaneously on three different commercial titania photocatalysts (Evonik Aeroxide P25, Aldrich rutile, and Aldrich anatase). For the synthesis of the composites two noble metal reduction methods (in situ and impregnation) and three noble metal deposition routes (i.e., by changing their deposition order, Au/Pt, Pt/Au, and Au-Pt simultaneously) were used. The photocatalytic performances of the nanocomposites were evaluated under UV irradiation, through degradation of oxalic acid and photocatalytic hydrogen production. The best performing photocatalyst was obtained by sequential noble metal deposition (first Au followed by Pt) on Evonik Aeroxide P25. The morphological and structural properties were studied/investigated by using DRS, TEM, HRTEM, EDX, and XRD. The gold and platinum nanoparticles formed clusters in most of the cases. Furthermore, the ecotoxicity of the composites was investigated using Lemna minor growth inhibition tests using static "lake" approach completed by DLS and ROS indirect measurements. The toxic effect of the composites which showed the highest photocatalytic activity did not differ from that of their commercial counterparts, showing that these nanoparticles were eco-friendly. This result shows the great capacity of these materials to be used in the next future in photocatalytic applications.

Original languageEnglish
Pages (from-to)12993-13006
Number of pages14
JournalACS Sustainable Chemistry and Engineering
Volume6
Issue number10
DOIs
Publication statusPublished - Oct 1 2018

Keywords

  • Ccotoxicology
  • Commercial titania
  • Gold and platinum
  • Lemna minor
  • Photoactivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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  • Cite this

    Hampel, B., Kovács, G., Czekes, Z., Hernádi, K., Danciu, V., Ersen, O., Girleanu, M., Focşan, M., Baia, L., & Pap, Z. (2018). Mapping the Photocatalytic Activity and Ecotoxicology of Au, Pt/TiO2 Composite Photocatalysts. ACS Sustainable Chemistry and Engineering, 6(10), 12993-13006. https://doi.org/10.1021/acssuschemeng.8b02465