4. Conclusion
In this paper, ZnCo2O4 was prepared by a
microwave-assisted process, and then
ZnCo2O4 was loaded onto
Ag3PO4 by in-situ chemical precipitation
method to obtain a composite photocatalyst. The catalytic activity and
cycle stability were evaluated under visible light, and the catalytic
reaction mechanism was proposed. The main conclusions are as follows:
(1)
ZnCo2O4/Ag3PO4exhibits high photocatalytic performance and good stability under room
temperature and visible light conditions. The photocatalytic degradation
rate of pure ZnCo2O4 within 30 minutes
is only 5%, and the photocatalytic efficiency is very low. The results
show that the degradation rate of MO by the
0.1ZnCo2O4/Ag3PO4composite system can reach 94% within 30 minutes, and MO is basically
degraded. Research has found that
ZnCo2O4 has a significant promoter
effect on the photocatalytic degradation of
Ag3PO4.
(2) In the stability test, after three cycles, the degradation rate of
MO by 0.1
ZnCo2O4/Ag3PO4remained at 84.4%, while the degradation rate of
Ag3PO4 was only 21.8%, indicating that
the stability of the 0.1
ZnCo2O4/Ag3PO4composite was significantly improved compared with
Ag3PO4. The photocatalytic activity was
the highest at 0.1
ZnCo2O4/Ag3PO4.
This study will play an important guiding role in pollution control.
(3) The visible light degradation of MO solution by
Ag3PO4 is very easy to inactivate. The
addition of ZnCo2O4 can accelerate the
separation of photoelectron holes and improve the stability and
catalytic activity of the catalyst.