Enhancement photocatalytic activity of the heterojunction of two-dimensional hybrid semiconductors ZnO/V2O5
In this work, we report the fabrication of the new heterojunction of two 2D hybrid layered semiconductors-ZnO (stearic acid)/VO (hexadecylamine)-and its behavior in the degradation of aqueous methylene blue under visible light irradiation. The optimal photocatalyst efficiency, reached at a ZnO (stea...
| Authors: | ; ; ; ; |
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| Format: | Article |
| Publication date: | 2018 |
| Country: | España |
| Institution: | Universitat Autònoma de Barcelona |
| Repository: | Dipòsit Digital de Documents de la UAB |
| Language: | English |
| OAI Identifier: | oai:ddd.uab.cat:204926 |
| Online Access: | https://ddd.uab.cat/record/204926 https://dx.doi.org/urn:doi:10.3390/catal8090374 |
| Access Level: | Open access |
| Keyword: | Photocatalysis Heterojunction Two-dimensional semiconductor ZnO V2O5 Methylene blue degradation |
| _version_ | 1878737955871260672 |
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| author | Aliaga, Juan|||0000-0003-2243-0805 |
| author2 | Cifuentes, Nasla González, Guillermo Sotomayor Torres, Clivia M.|||0000-0001-9986-2716 Benavente, Eglantina|||0000-0002-8414-9317 |
| author2_role | author author author author |
| author_browse | Aliaga, Juan|||0000-0003-2243-0805 Benavente, Eglantina|||0000-0002-8414-9317 Cifuentes, Nasla González, Guillermo Sotomayor Torres, Clivia M.|||0000-0001-9986-2716 |
| author_facet | Aliaga, Juan|||0000-0003-2243-0805 Cifuentes, Nasla González, Guillermo Sotomayor Torres, Clivia M.|||0000-0001-9986-2716 Benavente, Eglantina|||0000-0002-8414-9317 |
| author_role | author |
| collection | Dipòsit Digital de Documents de la UAB |
| description | In this work, we report the fabrication of the new heterojunction of two 2D hybrid layered semiconductors-ZnO (stearic acid)/VO (hexadecylamine)-and its behavior in the degradation of aqueous methylene blue under visible light irradiation. The optimal photocatalyst efficiency, reached at a ZnO (stearic acid)/VO (hexadecylamine) ratio of 1:0.25, results in being six times higher than that of pristine zinc oxide. Reusability test shows that after three photocatalysis cycles, no significant changes in either the dye degradation efficiency loss, nor the photocatalyst structure, occur. Visible light photocatalytic performance observed indicates there is synergetic effect between both 2D nanocomposites used in the heterojunction. The visible light absorption enhancement promoted by the narrower bandgap VO based components; an increased photo generated charge separation favored by extensive interface area; and abundance of hydrophobic sites for dye adsorption appear as probable causes of the improved photocatalytic efficiency in this hybrid semiconductors heterojunction. Estimated band-edge positions for both conduction and valence band of semiconductors, together with experiments using specific radical scavengers, allow a plausible photodegradation mechanism. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_a77fa32f5f9e3d46c8f2effaba4e6617 |
| institution | Universitat Autònoma de Barcelona |
| instname_str | Universitat Autònoma de Barcelona |
| language | eng |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:ddd.uab.cat:204926 |
| publishDate | 2018 |
| publishDateSort | 2018 |
| reponame_str | Dipòsit Digital de Documents de la UAB |
| spelling | Enhancement photocatalytic activity of the heterojunction of two-dimensional hybrid semiconductors ZnO/V2O5 Aliaga, Juan|||0000-0003-2243-0805 Cifuentes, Nasla González, Guillermo Sotomayor Torres, Clivia M.|||0000-0001-9986-2716 Benavente, Eglantina|||0000-0002-8414-9317 Photocatalysis Heterojunction Two-dimensional semiconductor ZnO V2O5 Methylene blue degradation In this work, we report the fabrication of the new heterojunction of two 2D hybrid layered semiconductors-ZnO (stearic acid)/VO (hexadecylamine)-and its behavior in the degradation of aqueous methylene blue under visible light irradiation. The optimal photocatalyst efficiency, reached at a ZnO (stearic acid)/VO (hexadecylamine) ratio of 1:0.25, results in being six times higher than that of pristine zinc oxide. Reusability test shows that after three photocatalysis cycles, no significant changes in either the dye degradation efficiency loss, nor the photocatalyst structure, occur. Visible light photocatalytic performance observed indicates there is synergetic effect between both 2D nanocomposites used in the heterojunction. The visible light absorption enhancement promoted by the narrower bandgap VO based components; an increased photo generated charge separation favored by extensive interface area; and abundance of hydrophobic sites for dye adsorption appear as probable causes of the improved photocatalytic efficiency in this hybrid semiconductors heterojunction. Estimated band-edge positions for both conduction and valence band of semiconductors, together with experiments using specific radical scavengers, allow a plausible photodegradation mechanism. https://ddd.uab.cat/record/204926 https://dx.doi.org/urn:doi:10.3390/catal8090374 |
| spellingShingle | Enhancement photocatalytic activity of the heterojunction of two-dimensional hybrid semiconductors ZnO/V2O5 Aliaga, Juan|||0000-0003-2243-0805 Photocatalysis Heterojunction Two-dimensional semiconductor ZnO V2O5 Methylene blue degradation |
| title | Enhancement photocatalytic activity of the heterojunction of two-dimensional hybrid semiconductors ZnO/V2O5 |
| title_full | Enhancement photocatalytic activity of the heterojunction of two-dimensional hybrid semiconductors ZnO/V2O5 |
| title_fullStr | Enhancement photocatalytic activity of the heterojunction of two-dimensional hybrid semiconductors ZnO/V2O5 |
| title_full_unstemmed | Enhancement photocatalytic activity of the heterojunction of two-dimensional hybrid semiconductors ZnO/V2O5 |
| title_short | Enhancement photocatalytic activity of the heterojunction of two-dimensional hybrid semiconductors ZnO/V2O5 |
| title_sort | Enhancement photocatalytic activity of the heterojunction of two-dimensional hybrid semiconductors ZnO/V2O5 |
| topic | Photocatalysis Heterojunction Two-dimensional semiconductor ZnO V2O5 Methylene blue degradation |
| topic_facet | Photocatalysis Heterojunction Two-dimensional semiconductor ZnO V2O5 Methylene blue degradation |
| url | https://ddd.uab.cat/record/204926 https://dx.doi.org/urn:doi:10.3390/catal8090374 |