Enhanced separation of photogenerated charge carriers and catalytic properties of ZnO-MnO<inf>2</inf> composites by microwave and photothermal effect

Wang, R; Hao, Q; Feng, J; Wang, GC; Ding, H; Chen, D; Ni, B

Enhanced separation of photogenerated charge carriers and catalytic properties of ZnO-MnO<inf>2</inf> composites by microwave and photothermal effect

Wang, R Hao, Q

Feng, J Wang, GC Ding, H Chen, D Ni, B

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Publication Type:: Journal Article
Citation:: Journal of Alloys and Compounds, 2019, 786 pp. 418 - 427
Issue Date:: 2019-05-25

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Field	Value	Language
dc.contributor.author	Wang, R	en_US
dc.contributor.author	Hao, Q https://orcid.org/0000-0001-9981-7499	en_US
dc.contributor.author	Feng, J	en_US
dc.contributor.author	Wang, GC	en_US
dc.contributor.author	Ding, H	en_US
dc.contributor.author	Chen, D	en_US
dc.contributor.author	Ni, B https://orcid.org/0000-0002-1129-7837	en_US
dc.date.issued	2019-05-25	en_US
dc.identifier.citation	Journal of Alloys and Compounds, 2019, 786 pp. 418 - 427	en_US
dc.identifier.issn	0925-8388	en_US
dc.identifier.uri	http://hdl.handle.net/10453/135228
dc.description.abstract	© 2019 Elsevier B.V. To improve the solar energy utilization and photodegradation efficiency of ZnO and α-MnO2, ZnO/MnO2 composite materials were prepared by a facile method. The materials are characterized by XRD, Raman spectra, X-ray photoelectron spectroscopy, scanning electronic microscopy, transmission electron microscopy, and UV–vis diffuse reflection spectroscopy. The photocatalytic activity and microwave-assisted photocatalytic activity of the composite are much higher than that of ZnO or α-MnO2. The main active species in the reaction progress were confirmed by electron paramagnetic resonance spectra and trapping experiments. According to the DFT calculation result and photothermal images, the enhanced catalytic activity is attributed to the photothermal and microwave-assisted effect. The addition of α-MnO2 improves the absorption of light and microwave by the composite, which can further heat up the catalysts. As a result, the separation of photogenerated charge carriers is accelerated. Finally, a mechanism for the enhanced catalytic performance of the composite materials was proposed.	en_US
dc.relation	http://purl.org/au-research/grants/arc/FT160100195
dc.relation.ispartof	Journal of Alloys and Compounds	en_US
dc.relation.isbasedon	10.1016/j.jallcom.2019.02.009	en_US
dc.subject.classification	Materials	en_US
dc.title	Enhanced separation of photogenerated charge carriers and catalytic properties of ZnO-MnO<inf>2</inf> composites by microwave and photothermal effect	en_US
dc.type	Journal Article
utslib.citation.volume	786	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0914 Resources Engineering and Extractive Metallurgy	en_US
utslib.for	0204 Condensed Matter Physics	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	786	en_US

Abstract:

© 2019 Elsevier B.V. To improve the solar energy utilization and photodegradation efficiency of ZnO and α-MnO2, ZnO/MnO2 composite materials were prepared by a facile method. The materials are characterized by XRD, Raman spectra, X-ray photoelectron spectroscopy, scanning electronic microscopy, transmission electron microscopy, and UV–vis diffuse reflection spectroscopy. The photocatalytic activity and microwave-assisted photocatalytic activity of the composite are much higher than that of ZnO or α-MnO2. The main active species in the reaction progress were confirmed by electron paramagnetic resonance spectra and trapping experiments. According to the DFT calculation result and photothermal images, the enhanced catalytic activity is attributed to the photothermal and microwave-assisted effect. The addition of α-MnO2 improves the absorption of light and microwave by the composite, which can further heat up the catalysts. As a result, the separation of photogenerated charge carriers is accelerated. Finally, a mechanism for the enhanced catalytic performance of the composite materials was proposed.

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http://hdl.handle.net/10453/135228