Harvesting the Vibration Energy with BaTiO3@Graphene for the Piezocatalytic Degradation of Methylene Blue

Authors

  • Tian Hou School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
  • Fang Cao School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
  • Meilin Li Department of Chemistry, University of Connecticut, Storrs, CT 06269-3060, USA
  • Jinlong Wang School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
  • Lingling Lv Ordos Institute of Environmental Science, Ordos, China

DOI:

https://doi.org/10.12974/2311-8741.2020.08.8

Keywords:

Barium titanate, Graphene, Piezocatalyst, Free charges, Methylene blue.

Abstract

Piezocatalysis is a newly advanced oxidation process (AOP) which can be triggered by mechanical force to generate electric field, and then drives free charge carriers to participate redox reactions. In this work, reduced graphene oxide (rGO) is integrated with the widely used barium titanate (BTO) to regulate the surface free charges of composites. The piezocatalytic activity of integrated composite (BTO@rGO) is strongly related with the mass ratio of BTO and rGO. Driven by ultrasonic force, BTO@rGO can completely decompose methylene blue (MB) within 120 min when the mass ratio of BTO to rGO is 2:1, showing the best activity comparing with samples of other mass ratios (10:1, 5:1, and 1:1). The introduction of graphene facilitates the interface charge transfer to BTO, which is proved by peak shift information of Raman and X-ray photoelectron spectroscopy (XPS). The generated hydroxyl radical (.OH) is the active species participating in MB oxidation. This work not only gives a clear understanding of interface electron transfer mechanism but also sheds light on the construction of well-performed piezocatalysts. 

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Published

2020-06-06

How to Cite

Hou, T., Cao, F., Li, M., Wang, J., & Lv, L. (2020). Harvesting the Vibration Energy with BaTiO3@Graphene for the Piezocatalytic Degradation of Methylene Blue. Journal of Environmental Science and Engineering Technology, 8, 84–91. https://doi.org/10.12974/2311-8741.2020.08.8

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