Assessment of oxidative visible light and UV active photocatalysts by hydroxyl radical quantification
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A simple method for determining hydroxyl radical yields on semiconductor photocatalysts is highly desirable, especially when comparing different photocatalyst materials. This paper reports the screening of a selection of visible light active photocatalysts such as Pt-C3N4, 5% LaCr doped SrTiO3, Sr0.95Cr0.05TiO3 and Yellow TiO2 and compares them against WO3 and ultra violet (UV) light activated TiO2 P25 (standard commercial catalysts) based on their oxidative strengths (OH radical producing capability) using a well-studied chemical probe − coumarin. 7-hydroxycoumarin, the only fluorescent hydroxylation product of this reaction can then be measured to indirectly quantify the OH radicals produced. P25 under UV light produced the highest concentration of OH radicals (16.9 μM), followed by WO3 (0.56 μM) and Pt-C3N4 (0.25 μM). The maximum OH radical production rate for P25, WO3 and Pt-C3N4 were also determined and found to be 35.6 μM/hr, 0.28 μM/hr and 0.88 μM/hr respectively. The other visible light activated photocatalysts did not produce any OH radicals primarily as a result of their electronic structure. Furthermore, it was concluded that, if any visible light absorbing photocatalysts are to be fabricated in future for the purpose of photocatalytic oxidation, their OH radical producing rates (and quantities) should be determined and compared to P25.
Nagarajan , S , Skillen , N C , Fina , F , Zhang , G , Randorn , C , Lawton , L A , Irvine , J T S & Robertson , P K J 2017 , ' Assessment of oxidative visible light and UV active photocatalysts by hydroxyl radical quantification ' Journal of Photochemistry and Photobiology A: Chemistry , vol 334 , pp. 13-19 . DOI: 10.1016/j.jphotochem.2016.10.034
Journal of Photochemistry and Photobiology A: Chemistry
© 2016 Elsevier B.V. All rights reserved. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1016/j.jphotochem.2016.10.034
This work was supported by the Engineering and Physical Sciences Research Council (Project number EP/K036769/1), Robert Gordon University’s IDEAS PhD studentship and Queen’s University Belfast’s PhD studentship.
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