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Article: Synergetic effect of vacuum ultraviolet photolysis and ozone catalytic oxidation for toluene degradation over MnO2-rGO composite catalyst

TitleSynergetic effect of vacuum ultraviolet photolysis and ozone catalytic oxidation for toluene degradation over MnO2-rGO composite catalyst
Authors
KeywordsVUV photolysis
Catalytic ozonation
VOCs
Manganese oxides
Reduced graphene oxides
Issue Date2021
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ces
Citation
Chemical Engineering Science, 2021, v. 231, p. article no. 116288 How to Cite?
AbstractAdvanced oxidation processes (AOPs) are regarded as one of the most promising technologies for VOC degradation. In this study, MnO2-rGO composite samples were prepared and applied in a system consisting of VUV photolysis and ozone catalytic oxidation for the degradation of toluene. Extensive characterizations, including BET, SEM, TEM, HRTEM, Raman, XRD, FTIR and XPS, were conducted to analyze the features of the composite MnO2-rGO samples. Results of toluene removal, mineralization and ozone decomposition showed that the MnO2-rGO composite sample with Mn loading of 25 wt% exhibited the best performance in this study due to its superior adsorption activity and moderated MnO2 loading. The intermediates of the degradation process were analyzed showing more by-products with shorter chains in the presence of the MnO2-rGO catalysts compared to VUV photolysis alone, indicating more complete reactions occurred. Generation of hydroxyl radicals (•OH) and superoxide radicals (•O2–) were confirmed to contribute in the toluene degradation. Two reaction pathways (i.e. •O2– and OH• based) and mechanism of toluene degradation were proposed.
Persistent Identifierhttp://hdl.handle.net/10722/300792
ISSN
2020 Impact Factor: 4.311
2020 SCImago Journal Rankings: 1.022
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWU, M-
dc.contributor.authorKWOK, YH-
dc.contributor.authorZHANG, Y-
dc.contributor.authorSzeto, W-
dc.contributor.authorHuang, H-
dc.contributor.authorLeung, DYC-
dc.date.accessioned2021-07-06T03:10:19Z-
dc.date.available2021-07-06T03:10:19Z-
dc.date.issued2021-
dc.identifier.citationChemical Engineering Science, 2021, v. 231, p. article no. 116288-
dc.identifier.issn0009-2509-
dc.identifier.urihttp://hdl.handle.net/10722/300792-
dc.description.abstractAdvanced oxidation processes (AOPs) are regarded as one of the most promising technologies for VOC degradation. In this study, MnO2-rGO composite samples were prepared and applied in a system consisting of VUV photolysis and ozone catalytic oxidation for the degradation of toluene. Extensive characterizations, including BET, SEM, TEM, HRTEM, Raman, XRD, FTIR and XPS, were conducted to analyze the features of the composite MnO2-rGO samples. Results of toluene removal, mineralization and ozone decomposition showed that the MnO2-rGO composite sample with Mn loading of 25 wt% exhibited the best performance in this study due to its superior adsorption activity and moderated MnO2 loading. The intermediates of the degradation process were analyzed showing more by-products with shorter chains in the presence of the MnO2-rGO catalysts compared to VUV photolysis alone, indicating more complete reactions occurred. Generation of hydroxyl radicals (•OH) and superoxide radicals (•O2–) were confirmed to contribute in the toluene degradation. Two reaction pathways (i.e. •O2– and OH• based) and mechanism of toluene degradation were proposed.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ces-
dc.relation.ispartofChemical Engineering Science-
dc.subjectVUV photolysis-
dc.subjectCatalytic ozonation-
dc.subjectVOCs-
dc.subjectManganese oxides-
dc.subjectReduced graphene oxides-
dc.titleSynergetic effect of vacuum ultraviolet photolysis and ozone catalytic oxidation for toluene degradation over MnO2-rGO composite catalyst-
dc.typeArticle-
dc.identifier.emailLeung, DYC: ycleung@hku.hk-
dc.identifier.authorityLeung, DYC=rp00149-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ces.2020.116288-
dc.identifier.scopuseid_2-s2.0-85096464940-
dc.identifier.hkuros323075-
dc.identifier.volume231-
dc.identifier.spagearticle no. 116288-
dc.identifier.epagearticle no. 116288-
dc.identifier.isiWOS:000609490700011-
dc.publisher.placeUnited Kingdom-

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