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Comparative photoactivity of CeO2, γ-Fe2O3, TiO2 and ZnO in various aqueous systems

Paper ID Volume ID Publish Year Pages File Format Full-Text
47127 46459 2011 8 PDF Available
Title
Comparative photoactivity of CeO2, γ-Fe2O3, TiO2 and ZnO in various aqueous systems
Abstract

Photoactive nanomaterials may be released into natural water systems where the interactions with ambient light and natural water chemistry are largely unknown. Using a high-throughput approach, the photoactivity of four nanoscale metal oxides was investigated, at various environmentally relevant concentrations. Photoactivity was measured in deionized water at various pH and also in seawater. TiO2 was the most photoactive nanoparticle under most deionized conditions followed by γ-Fe2O3, ZnO and CeO2. In natural seawater ZnO replaced TiO2 as the most photoactive nanomaterial and was followed in decreasing photoactivity by TiO2. In seawater, CeO2 reduced the degradation of the organic probe, suggesting the ability of CeO2 to act as an antioxidant. The high-throughput method developed in this research enables a rapid, reproducible and accurate assessment of nanomaterial photoactivity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Oscillator strength is a suitable a priori tool to assess the photoactivity of metals oxides ▶ A UV-transparent microplate is a rapid, reliable and suitable reaction vessel. ▶ At environmentally relevant concentrations, photoactive metal oxide nanomaterials have limited reactivity.

Keywords
Nanomaterials; Photocatalysis; Photoactivity; Natural waters; TiO2
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Comparative photoactivity of CeO2, γ-Fe2O3, TiO2 and ZnO in various aqueous systems
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 102, Issues 3–4, 22 February 2011, Pages 600–607
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us