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Catalysis Science & Technology
Page 7 of 9
DOI: 10.1039/C8CY00409A
Journal Name
ARTICLE
pollutants could mainly be photo-decomposed by direct holes
which were spatial separated from photo-generated electrons
and accordingly be long-lived at the VB of Bi2MoO6. Then, upon
the interfaces of the heterojunction of S-1 shown in Scheme
Acknowledgements
This work was financially supported by China Postdoctoral
Science Foundation (No. 2017M620073).
•−
1a, no yield of •OH and O2 should be expected due to the
limited oxidization and reduction capability of VB potential of
Bi2MoO6 and CB potential of Bi2SiO5. Interestingly, strong
signals of DMPO-•OH adducts for S-1 after 2 mins of UV light
illumination appeared, this may be originated from the
individually bare surfaces of Bi2SiO5 polyhedron which can give
rise to •OH through its more positive potential than the redox
potential of •OH/H2O. As a result, in sample S-1, the pollutants
could be easily photo-degraded by reactive species of •OH or
holes.
Notes and references
1
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Based on the above characterization results, on one side,
2-
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,
with increasing adding amount of SiO3
,
growing
transformation degree from Bi2MoO6 into Bi2SiO5 (that is
continuously reduced ratio of Bi2MoO6:Bi2SiO5) was confirmed.
On the other side, with the increasing of SiO32-, the hierarchical
architectures assembled by Bi2MoO6 tiny nanoplates gradually
evolved into big Bi2SiO5 polyhedron structures through the ion
exchange reaction, resulting in a trend of ascending firstly and
then descended for the BET surface areas of the as-prepared
samples. As a result, main component in S-0.2 and S-1 can be
respectively identified as Bi2MoO6 and Bi2SiO5. Herein,
moderate BET surface areas, hierarchical frameworks with
roughness together with the aid of promoted separation
efficiencies of photo-generated carriers upon the interfaces of
Bi2SiO5/Bi2MoO6, it was reasonable that S-0.2 showed the best
visible light activity and S-1 exhibited the highest UV light
activity.
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Conclusions
In summary, to develop photocatalysts with high-efficiency for
environmental
purification,
we
constructed
novel
Bi2SiO5/Bi2MoO6 heterojunctions via an ion exchange strategy
under hydrothermal process by using Bi2MoO6 as a sacrificial
material. In addition, the heterostructured product with
optimal UV/visible light catalytic activity could be achieved by
adjusting the adding amount of incoming SiO32-, which also
greatly surpass the photocatalytic activities of pure Bi2MoO6
over degradation of phenol and MO. Their photocatalytic
activity enhancements could be attributed to their relatively
higher surface areas, the contribution of the enhanced light
absorption of the Bi2MoO6 component and efficient charge
carriers transfer driven by the interfacial potential difference
of Bi2SiO5/Bi2MoO6, which was verified by their matched
straddling energy band and PL decay spectra. This novel and
powerful Bi2SiO5/Bi2MoO6 heterostructured system would
have great potential in the area of water environmental
purification.
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Conflicts of interest
Adv., 2015, 5, 75081-75088.
There are no conflicts to declare.
This journal is © The Royal Society of Chemistry 20xx
J. Name., 2013, 00, 1-3 | 7
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