Synergistically Enhanced Photocatalytic Degradation by Coupling Slow-Photon Effect with Z-Scheme Charge Transfer in CdS QDs/IO-TiO<sub>2</sub> Heterojunction
Lower light absorption and faster carrier recombination are significant challenges in photocatalysis. This study introduces a novel approach to address these challenges by anchoring cadmium sulfide quantum dots (CdS QDs) on inverse opal (IO)-TiO<sub>2</sub>, which increases light absorpt...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-07-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/14/5437 |
| _version_ | 1827732244021641216 |
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| author | Li-Bang Zhu Ning Bao Qing Zhang Shou-Nian Ding |
| author_facet | Li-Bang Zhu Ning Bao Qing Zhang Shou-Nian Ding |
| author_sort | Li-Bang Zhu |
| collection | DOAJ |
| description | Lower light absorption and faster carrier recombination are significant challenges in photocatalysis. This study introduces a novel approach to address these challenges by anchoring cadmium sulfide quantum dots (CdS QDs) on inverse opal (IO)-TiO<sub>2</sub>, which increases light absorption and promotes carriers’ separation by coupling slow-photon effect with Z-scheme charge transfer. Specifically, the IO-TiO<sub>2</sub> was created by etching a polystyrene opal template, which resulted in a periodic structure that enhances light absorption by reflecting light in the stop band. The size of CdS quantum dots (QDs) was regulated to achieve appropriate alignment of energy bands between CdS QDs and IO-TiO<sub>2</sub>, promoting carrier transfer through alterations in charge transfer modes and resulting in synergistic-amplified photocatalysis. Theoretical simulations and electrochemical investigations demonstrated the coexistence of slow-photon effects and Z-scheme transfer. The system’s photodegradation performance was tested using rhodamine B as a model. This novel hierarchical structure of the Z-scheme heterojunction exhibits degradability 7.82 and 4.34 times greater than pristine CdS QDs and IO-TiO<sub>2</sub>, respectively. This study serves as a source of inspiration for enhancing the photocatalytic capabilities of IO-TiO<sub>2</sub> and broadening its scope of potential applications. |
| first_indexed | 2024-03-11T00:46:54Z |
| format | Article |
| id | doaj.art-5be9b4850ce44b229cadf6e170701c07 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T00:46:54Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-5be9b4850ce44b229cadf6e170701c072023-11-18T20:42:07ZengMDPI AGMolecules1420-30492023-07-012814543710.3390/molecules28145437Synergistically Enhanced Photocatalytic Degradation by Coupling Slow-Photon Effect with Z-Scheme Charge Transfer in CdS QDs/IO-TiO<sub>2</sub> HeterojunctionLi-Bang Zhu0Ning Bao1Qing Zhang2Shou-Nian Ding3School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, ChinaSchool of Public Health, Nantong University, Nantong 226019, ChinaChinese Academy of Inspection and Quarantine, Beijing 100176, ChinaSchool of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, ChinaLower light absorption and faster carrier recombination are significant challenges in photocatalysis. This study introduces a novel approach to address these challenges by anchoring cadmium sulfide quantum dots (CdS QDs) on inverse opal (IO)-TiO<sub>2</sub>, which increases light absorption and promotes carriers’ separation by coupling slow-photon effect with Z-scheme charge transfer. Specifically, the IO-TiO<sub>2</sub> was created by etching a polystyrene opal template, which resulted in a periodic structure that enhances light absorption by reflecting light in the stop band. The size of CdS quantum dots (QDs) was regulated to achieve appropriate alignment of energy bands between CdS QDs and IO-TiO<sub>2</sub>, promoting carrier transfer through alterations in charge transfer modes and resulting in synergistic-amplified photocatalysis. Theoretical simulations and electrochemical investigations demonstrated the coexistence of slow-photon effects and Z-scheme transfer. The system’s photodegradation performance was tested using rhodamine B as a model. This novel hierarchical structure of the Z-scheme heterojunction exhibits degradability 7.82 and 4.34 times greater than pristine CdS QDs and IO-TiO<sub>2</sub>, respectively. This study serves as a source of inspiration for enhancing the photocatalytic capabilities of IO-TiO<sub>2</sub> and broadening its scope of potential applications.https://www.mdpi.com/1420-3049/28/14/5437photocatalysisslow photons effectZ-schemeinverse opal photonic crystal |
| spellingShingle | Li-Bang Zhu Ning Bao Qing Zhang Shou-Nian Ding Synergistically Enhanced Photocatalytic Degradation by Coupling Slow-Photon Effect with Z-Scheme Charge Transfer in CdS QDs/IO-TiO<sub>2</sub> Heterojunction Molecules photocatalysis slow photons effect Z-scheme inverse opal photonic crystal |
| title | Synergistically Enhanced Photocatalytic Degradation by Coupling Slow-Photon Effect with Z-Scheme Charge Transfer in CdS QDs/IO-TiO<sub>2</sub> Heterojunction |
| title_full | Synergistically Enhanced Photocatalytic Degradation by Coupling Slow-Photon Effect with Z-Scheme Charge Transfer in CdS QDs/IO-TiO<sub>2</sub> Heterojunction |
| title_fullStr | Synergistically Enhanced Photocatalytic Degradation by Coupling Slow-Photon Effect with Z-Scheme Charge Transfer in CdS QDs/IO-TiO<sub>2</sub> Heterojunction |
| title_full_unstemmed | Synergistically Enhanced Photocatalytic Degradation by Coupling Slow-Photon Effect with Z-Scheme Charge Transfer in CdS QDs/IO-TiO<sub>2</sub> Heterojunction |
| title_short | Synergistically Enhanced Photocatalytic Degradation by Coupling Slow-Photon Effect with Z-Scheme Charge Transfer in CdS QDs/IO-TiO<sub>2</sub> Heterojunction |
| title_sort | synergistically enhanced photocatalytic degradation by coupling slow photon effect with z scheme charge transfer in cds qds io tio sub 2 sub heterojunction |
| topic | photocatalysis slow photons effect Z-scheme inverse opal photonic crystal |
| url | https://www.mdpi.com/1420-3049/28/14/5437 |
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