期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 891, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.161872
关键词
oxygen vacancy; nano heterojunction; TiO2; GQDs; transmission of carriers
资金
- National Natural Science Foundation of China [21676213, 21807087, 22077099]
- Natural Science Basic Research Plan in Shaanxi Province of China [2021JQ-440, 2020JM-422]
- Key Research and Development Program of Shaanxi [2019KWZ-07]
- Key Science and Technology Innovation Team of Shaanxi Province [2017KCT-37]
This study investigated the redox activity of Graphene quantum dots/TiO2 (GQDs/TiO2) hybrid during water treatment under visible light irradiation. The introduction of oxygen vacancy (V-o) in TiO2 was found to expedite charge transfer and enhance the photocatalytic activity. The findings suggest that the presence of V-o induces visible light excitation, quick charge separation, and effective transmission between GQDs and TiO2, resulting in improved performance in Cr (VI) and RhB removal system.
Understanding the underlying transport mechanism of photogenerated carriers is crucial in designing active heterojunctions in the field of photocatalysis. In this study, the redox activity of Graphene quantum dots/TiO2 (GQDs/TiO2) hybrid was investigated through water treatment under visible light irradiation. The corresponding findings showed that the charge transfer between GQDs and TiO2 accompanied with oxygen vacancy (V-o) was expedited, resulting in enhanced redox activity in the Cr (VI) and RhB co-removing system. Further investigation revealed that V-o introduced a defect level in TiO2 just below its conduction band that could induce visible light excitation while leading to quick charge separation and effective transmission from GQDs to TiO2. Therefore, carrying out photocatalytic Cr (VI) reduction and RhB degradation synchronously over GQDs/TiO2 can roughly enhance 2 and 3 times pure TiO2 nanosheets under visible light irradiation. The findings of this study may provide novel insight into heterojunction engineering and defect level controlling in order to attain efficient photocatalyst and offer additional prospects for photocatalytic applications. (C) 2021 Elsevier B.V. All rights reserved.
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