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Dendritic BiVO4 decorated with MnOx co-catalyst as an efficient hierarchical catalyst for photocatalytic ozonation |
Jin Yang1,2, Xuelian Liu1,2, Hongbin Cao1,2, Yanchun Shi2, Yongbing Xie2( ), Jiadong Xiao2,3 |
1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China 2. Beijing Engineering Research Center of Process Pollution Control, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 3. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract An appropriate co-catalyst can significantly promote the photocatalytic efficacy, but this has been seldom studied in the visible-light photocatalysis combined with ozone, namely photocatalytic ozonation. In this work, a dendritic bismuth vanadium tetraoxide (BiVO4) material composited with highly dispersed MnOx nanoparticles was synthesized, and its catalytic activity is 86.6% higher than bare BiVO4 in a visible light and ozone combined process. Catalytic ozonation experiments, ultra-violet-visible (UV-Vis) diffuse reflectance spectra and photoluminescence spectra jointly indicate that MnOx plays a triple role in this process. MnOx strengthens the light adsorption and promotes the charge separation on the composite material, and it also shows good activity in catalytic ozonation. The key reactive species in this process is ·OH, and various pathways for its generation in this process is proposed. This work provides a new direction of catalyst preparation and pushes forward the application of photocatalytic ozonation in water treatment.
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Keywords
manganese oxide
bismuth vanadium tetraoxide
photocatalytic ozonation
hydroxyl radical
co-catalyst
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Corresponding Author(s):
Yongbing Xie
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Just Accepted Date: 09 February 2018
Online First Date: 15 August 2018
Issue Date: 25 February 2019
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