期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 286, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2020.121301
关键词
TiO2 morphologies; TiO2/rGO photocatalysts; Interfacial charge transfer; Visible light irradiation; Reactive oxygen species
资金
- National Nature Science Foundation of China [21507067]
- Doctoral Found for Cooperation Projects of Qilu University of Technology (Shandong Academy of Sciences) [2017BSHZ019, 2018BSHZ0021]
- International Cooperation Research Special Funds Project of Qilu University of Technology (Shandong Academy of Sciences) [QLUTGJHZ2018004]
In most cases, different morphologies of the same composites correspond to different properties. In this paper, the TiO2/rGO heterostructure system with three morphologies was obtained by one-step hydrothermal method through regulating hydrothermal time. Compared with TiO2 nanoparticle/reduced graphene oxide (TNP/rGO) and TiO2 nanobelt/reduced graphene oxide (TNB/rGO), TiO2 nanotube/reduced graphene oxide (TNT/rGO) showed higher photocatalytic activity (78.5%, 2 h) toward degrading Rhodamine B and 2, 4-Dichlorophenol under visible light. The mechanism of enhancing photocatalytic activities of the TiO2/rGO system was confirmed by free radicals trapping experiment, ESR, PL and photocurrent measurement. It is revealed that the hole (h(+)) is the main reactive specie in TNT/rGO heterojunction and rapid transfer of photogenerated electrons is responsible for enhancing photocatalytic activity. This work not only emphasizes the important role of morphology in improving photocatalytic activity, but also provides a simple strategy to alter the morphology of TiO2.
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