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Journal of Nanoparticle Research

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01.08.2022 | Research paper

3DOM N/TiO₂ composite modified by CdS QDs with Z-scheme: enhanced photocatalytic degradation and hydrogen evolution

verfasst von: Yiwen Zhu, Yu Tian, Li Li, Jiaqi Hou, Yali Huo, Tianqi Sun, Jiaxin Li

Erschienen in: Journal of Nanoparticle Research | Ausgabe 8/2022

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Abstract

3DOM CdS QDs-N/TiO₂ composite was synthesized by CdS quantum dots (QDs) modified on the surface of 3DOM N/TiO₂, of which the main component is anatase TiO₂. The crystallinity of TiO₂ is improved by using polystyrene (PS) colloidal microspheres as the template. The introduction of CdS QDs not only expands the light absorption range of 3DOM N/TiO₂, but also a Z-scheme heterojunction optimizing the charge transfer is formed. The results of photoluminescence spectroscopy and electrochemical impedance show that the lifetime of photogenerated charge carrier is prolonged in the composite 3DOM CdS QDs-N/TiO₂, and the recombination of photogenerated electron–hole pairs is suppressed effectively. Compared with the main catalyst TiO₂, the photocatalytic activity of 3DOM CdS QDs-N/TiO₂ is significantly enhanced. In the photohydrogen production experiment, the photohydrogen production capacity of 3DOM CdS QDs-N/TiO₂ composite material (2247 μmol·g⁻¹, 8 h) is 172.8 times that of the commercially available P25. After using 2.0 wt% Pt as a co-catalyst, the amount of hydrogen evolution (16,663 μmol·g⁻¹, 8 h) increases ca. 7.4 times. Through capture experiments, the possible photocatalytic reaction mechanism and the reason for the enhanced photocatalytic performance were speculated and discussed.

Graphical abstract

Using polystyrene colloidal microspheres as the template, a three-dimensional ordered macroporous composite 3DOM CdS QDs-N/TiO₂ was synthesized by vacuum impregnation and hydrothermal deposition. The quantum effect of CdS QDs, the unique 3DOM structure and the synergy between the Z-type heterojunction further increase the light absorption range of 3DOM CdS QDs-N/TiO₂, which show the better perform of multi-mode photocatalytic degradation and photocatalytic hydrogen evolution.

Vorheriger Artikel Space confinement of physical deposited Au nanoparticles on a three-dimensional-branched TiO2 photoanode for efficient photoelectrochemical overall water splitting

Nächster Artikel Anticonvulsant and acute toxicity evaluation of phenytoin sodium–loaded polymeric nanomicelle in MES rat model

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Titel: 3DOM N/TiO2 composite modified by CdS QDs with Z-scheme: enhanced photocatalytic degradation and hydrogen evolution
verfasst von: Yiwen Zhu
Yu Tian
Li Li
Jiaqi Hou
Yali Huo
Tianqi Sun
Jiaxin Li
Publikationsdatum: 01.08.2022
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 8/2022
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-022-05550-z

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