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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2019, Vol. 13 Issue (1) : 185-191    https://doi.org/10.1007/s11705-018-1713-z
RESEARCH ARTICLE
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.

Keywords manganese oxide      bismuth vanadium tetraoxide      photocatalytic ozonation      hydroxyl radical      co-catalyst     
Corresponding Author(s): Yongbing Xie   
Just Accepted Date: 09 February 2018   Online First Date: 15 August 2018    Issue Date: 25 February 2019
 Cite this article:   
Jin Yang,Xuelian Liu,Hongbin Cao, et al. Dendritic BiVO4 decorated with MnOx co-catalyst as an efficient hierarchical catalyst for photocatalytic ozonation[J]. Front. Chem. Sci. Eng., 2019, 13(1): 185-191.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-018-1713-z
https://academic.hep.com.cn/fcse/EN/Y2019/V13/I1/185
Fig.1  (a) OA degradation rate constants over MnOx@BiVO4 with different loading contents of MnOx; (b) degradation results of OA in visible light photocatalysis, ozonation, catalytic ozonation and photocatalytic ozonation over BiVO4 and MnOx@BiVO4 catalysts
Fig.2  XRD patterns of branched BiVO4, MnOx@BiVO4 and the corresponding standard card
Fig.3  (a) SEM images of BiVO4 and (b) MnOx@BiVO4, (c) the element mapping image of Mn, and (d) EDS spectrum of MnOx@BiVO4
Fig.4  (a) UV-Vis DRS spectra, (b) Mn 2p XPS spectra, and (c) PL spectra of BiVO4 and MnOx@BiVO4
Fig.5  (a) t-BA quenching in photocatalytic ozonation with BiVO4, (b) MnOx@BiVO4. DMPO spin-trapping EPR spectra of Vis/O3/BiVO4 and (c) Vis/O3/MnOx@BiVO4 at 298 K
Fig.6  Proposed mechanism for MnOx@BiVO4 catalyzed photocatalytic ozonation under visible light
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