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Z-scheme Bi2MoO6 nanoplate-decorated flower-like Bi12SiO20 for efficient photocatalytic degradation of organic pollutants
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Journal Article
Z-scheme Bi2MoO6 nanoplate-decorated flower-like Bi12SiO20 for efficient photocatalytic degradation of organic pollutants
2021
Overview
A novel Z-scheme Bi
2
MoO
6
/Bi
12
SiO
20
(MS) heterojunction, with 2D nanoplates of Bi
2
MoO
6
anchored on the surface of flower-shaped Bi
12
SiO
20
particles, was synthesized via simple solvothermal process for the first time. A series of techniques including XRD, XPS, SEM, TEM, BET, UV–vis DRS and Mott–Schottky were used for characterizing the photocatalysts. The MS
0.6
(the heterojunction with a Bi
2
MoO
6
/MS mass ratio of 0.6:1) exhibited optimal photocatalytic activity for degrading RhB, and the reaction rate constant achieved 0.041 min
−1
, which was 41 and 4.6 times that of Bi
12
SiO
20
and Bi
2
MoO
6
, respectively. The MS
0.6
also presents outstanding activity for the degradation of BPA (0.014 min
−1
), which was 3.5 and 14 times that of Bi
12
SiO
20
and Bi
2
MoO
6
, respectively. Furthermore, the UV–vis absorption spectrum and TOC test confirmed that the mineralization capacity of Bi
2
MoO
6
was significantly enhanced after coupling with Bi
12
SiO
20
. The enhanced performance was attributed to the improved light absorption and excellent separation efficiency of photo-induced carriers. Trapping and ESR experiments indicated that h
+
and •O
2
−
jointly dominated the degradation of RhB. Therefore, a reliable Z-scheme mechanism was proposed. Additionally, MS
0.6
presented a good stability and durability in four catalytic runs. This study provides an insight for designing highly efficient Z-scheme Bi
12
SiO
20
-based photocatalysts for the practical sewage disposal.
Graphical abstract
Publisher
Springer US,Springer Nature B.V
