期刊
APPLIED SURFACE SCIENCE
卷 544, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148607
关键词
Graphene; Copper oxide; Heterostructure; Photocatalytic activity; Stability
类别
资金
- Public Technology Research Plan of Zhejiang Province [LGF18E030003]
- National Natural Science Foundation of China [51672251]
- 521 Talent Project of Zhejiang Sci-Tech University
A novel multiple-phase heterostructure of reduced graphene oxide/copper oxide/cuprous oxide (rGO/CuO/Cu2O) was proposed, showing superior photocatalytic activity and enhanced stability due to the interface synergistic effect and polycrystalline structure, making it a promising Cu-based semiconductor photocatalyst for water purification.
In this work, a novel multiple-phase heterostructure of reduced graphene oxide/copper oxide/cuprous oxide (rGO/CuO/Cu2O) was proposed, where hierarchical ball-like CuO/Cu2O was grown on rGO in situ by a facile one-pot hydrothermal method. The obtained rGO/CuO/Cu2O heterojunction displayed superior photocatalytic activity with a 99.8% degradation rate for tetracycline (TC) under visible light. Moreover, the stability of the resultant rGO/CuO/Cu2O catalyst was significantly enhanced, where it maintained degradation rate above 90.7% even after 10 consecutive runs. The improved photocatalytic performance and durability of the rGO/CuO/Cu2O heterojunction could be attributed to the interface synergistic effect among CuO, Cu2O and the planner structure of rGO sheets which developed unprecedented polycrystalline structure. Also, rGO not only regarded as an acceptor and transporter of the photogenerated electrons, but also act as photosensitizer to increase the photon capture ability and protector to enhances photocatalytic stability. This work shows a new scheme system of rGO/CuO/Cu2O heterostructure and a more efficient Cu-based semiconductor photocatalyst toward water purification.
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