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Supported versus colloidal zinc oxide for advanced oxidation processes
KTH, School of Engineering Sciences (SCI), Applied Physics.
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2017 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 411, 285-290 p.Article in journal (Refereed) Published
Abstract [en]

Photocatalysis is a green technology which typically utilizes either supported or colloidal catalysts for the mineralization of aqueous organic contaminants. Catalyst surface area and surface energy are the primary factors determining its efficiency, but correlation between the two is still unclear. This work explores their relation and hierarchy in a photocatalytic process involving both supported and colloidal catalysts. In order to do this the active surface areas of supported zinc oxide nanorods (ZnO NR's) and colloidal zinc oxide nanoparticles (having different surface energies) were equalized and their phenol oxidation mechanism and capacity was analyzed. It was observed that while surface energy had subtle effects on the oxidation rate of the catalysts, the degradation efficiency was primarily a function of the surface area; which makes it a better parameter for comparison when studying different catalyst forms of the same material. Thus we build a case for the use of supported catalysts, wherein their catalytic efficiency was tested to be unaltered over several days under both natural and artificial light, suggesting their viability for practical applications.

Place, publisher, year, edition, pages
Elsevier B.V. , 2017. Vol. 411, 285-290 p.
Keyword [en]
Phenol degradation, Photocatalysis, Supported catalysts, Surface area, Zinc oxide, Biodegradation, Catalysis, Catalysts, Degradation, Energy efficiency, Interfacial energy, Nanorods, Oxidation, Phenols, Zinc, Advanced Oxidation Processes, Catalytic efficiencies, Degradation efficiency, Photocatalytic process, Zinc oxide nanoparticles, Zinc oxide nanorods, Catalyst supports
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207287DOI: 10.1016/j.apsusc.2017.03.139ISI: 000401391900035Scopus ID: 2-s2.0-85016441643OAI: oai:DiVA.org:kth-207287DiVA: diva2:1111827
Note

QC 20170619

Available from: 2017-06-19 Created: 2017-06-19 Last updated: 2017-06-19Bibliographically approved

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Dutta, Joydeep

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CiteExportLink to record
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  • apa
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