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Enhanced Visible Light Photodegradation of Microplastic Fragments with Plasmonic Platinum/Zinc Oxide Nanorod Photocatalysts
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. Islamic Univ Technol, Dept Civil & Environm Engn CEE, Dhaka 1704, Bangladesh..
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0002-1679-1316
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0001-9424-6965
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0002-0074-3504
2019 (English)In: Catalysts, ISSN 2073-4344, Vol. 9, no 10, article id 819Article in journal (Refereed) Published
Abstract [en]

Microplastics are persistent anthropogenic pollutants which have become a global concern owing to their widespread existence and unfamiliar threats to the environment and living organisms. This study demonstrates the degradation of fragmented microplastics particularly low-density polyethylene (LDPE) film in water, through visible light-induced plasmonic photocatalysts comprising of platinum nanoparticles deposited on zinc oxide (ZnO) nanorods (ZnO-Pt). The ZnO-Pt nanocomposite photocatalysts were observed to have better degradation kinetics for a model organic dye (methylene blue) compared to bare ZnO nanorods, attributed to the plasmonic effects leading to better interfacial exciton separation and improved hydroxyl radical activity along with a 78% increase in visible light absorption. These demonstrations of the plasmonically enhanced photocatalyst enabled it to effectively degrade microplastic fragments as confirmed following the changes in carbonyl and vinyl indices in infrared absorption. In addition, visual proof of physical surface damage of the LDPE film establishes the efficacy of using plasmonically enhanced nanocomposite photocatalytic materials to tackle the microplastic menace using just sunlight for a clean and green approach towards mitigation of microplastics in the ecosystem.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 10, article id 819
Keywords [en]
microplastics, visible light photodegradation, ZnO nanorod, platinum nanoparticle, nanocomposite, LDPE film
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Identifiers
URN: urn:nbn:se:kth:diva-265446DOI: 10.3390/catal9100819ISI: 000498266100035Scopus ID: 2-s2.0-85073602074OAI: oai:DiVA.org:kth-265446DiVA, id: diva2:1379627
Note

QC 20191217

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2020-01-02Bibliographically approved

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Tofa, Tajkia SyeedFei, YeLaxman, KarthikDutta, Joydeep

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