CdTe quantum dot-functionalized P25 titania composite with enhanced photocatalytic NO2 storage selectivity under UV and vis irradiation

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buir.contributor.authorBalcı-Leinen, Merve
buir.contributor.authorDede, Didem
buir.contributor.authorKhan, Münir Ullah
buir.contributor.authorÇağlayan, Mustafa
buir.contributor.authorKoçak, Yusuf
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.authorÖzensoy, Emrah
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage879en_US
dc.citation.issueNumber1en_US
dc.citation.spage865en_US
dc.citation.volumeNumber11en_US
dc.contributor.authorBalcı-Leinen, Merveen_US
dc.contributor.authorDede, Didemen_US
dc.contributor.authorKhan, Münir Ullahen_US
dc.contributor.authorÇağlayan, Mustafaen_US
dc.contributor.authorKoçak, Yusufen_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.contributor.authorÖzensoy, Emrahen_US
dc.date.accessioned2020-02-12T13:17:55Z
dc.date.available2020-02-12T13:17:55Z
dc.date.issued2019
dc.departmentDepartment of Chemistryen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractComposite systems of P25 (titania) functionalized with thioglycolic acid (TGA)-capped CdTe colloidal quantum dots (QDs) were synthesized, structurally characterized, and photocatalytically tested in the photocatalytic NOx oxidation and storage during NO(g) + O2(g) reaction. Pure P25 yielded moderate-to-high NO conversion (31% in UV-A and 40% in visible (vis)) but exhibited extremely poor selectivity toward NOx storage in solid state (25% in UV-A and 35% in vis). Therefore, P25 could efficiently photooxidize NO(g) + O2(g) into NO2; however, it failed to store photogenerated NO2 and released toxic NO2(g) to the atmosphere. CdTe QD-functionalized P25 revealed a major boost in photocatalytic performance with respect to pure P25, where NO conversion reached 42% under UV-A and 43% under vis illumination, while the respective selectivity climbed up to 92 and 97%, rendering the CdTe/P25 composite system an efficient broad-band photocatalyst, which can harvest both UV-A and vis light efficiently and display a strong NOx abatement effect. Control experiments suggested that photocatalytic active sites responsible for the NO(g) + O2(g) photooxidation and formation of NO2 reside mostly on titania, while the main functions of the TGA capping agent and the CdTe QDs are associated with the photocatalytic conversion of the generated NO2 to the adsorbed NOx species, significantly boosting the selectivity toward solid-state NOx storage. Reuse experiments showed that photocatalytic performance of the CdTe/P25 system can be preserved to a reasonable extent with only a moderate decrease in the photocatalytic performance. Although some decrease in the photocatalytic activity was observed after aging, CdTe/P25 could still outperform P25 benchmark photocatalyst. Increasing CdTe QDs loading from the currently optimized minuscule concentrations could be a useful strategy to increase further the catalytic lifetime/stability of the CdTe/P25 system with only a minor penalty in catalytic activity.en_US
dc.description.provenanceSubmitted by Zeynep Aykut (zeynepay@bilkent.edu.tr) on 2020-02-12T13:17:55Z No. of bitstreams: 1 CdTe_quantum_dot_functionalized_P25_titania_composite_with_enhanced_photocatalytic_NO_2_storage_selectivity_under_UV_and_vis_irradiation.pdf: 11436404 bytes, checksum: b1e3b5450043d61a5cd3206747bf7ba6 (MD5)en
dc.description.provenanceMade available in DSpace on 2020-02-12T13:17:55Z (GMT). No. of bitstreams: 1 CdTe_quantum_dot_functionalized_P25_titania_composite_with_enhanced_photocatalytic_NO_2_storage_selectivity_under_UV_and_vis_irradiation.pdf: 11436404 bytes, checksum: b1e3b5450043d61a5cd3206747bf7ba6 (MD5) Previous issue date: 2019en
dc.identifier.doi10.1021/acsami.8b18036en_US
dc.identifier.issn1944-8244
dc.identifier.urihttp://hdl.handle.net/11693/53320
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttps://dx.doi.org/10.1021/acsami.8b18036en_US
dc.source.titleACS Applied Materials and Interfacesen_US
dc.subjectCdTe colloidal quantum dotsen_US
dc.subjectTitanium dioxideen_US
dc.subjectPhotocatalytic NOx abatementen_US
dc.titleCdTe quantum dot-functionalized P25 titania composite with enhanced photocatalytic NO2 storage selectivity under UV and vis irradiationen_US
dc.typeArticleen_US

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Department of Chemistry
Department of Electrical and Electronics Engineering
Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)
Nanotechnology Research Center (NANOTAM)