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The solvothermal synthesis of novel β-Bi2O3/(BiO)4(OH)2CO3 heterojunctions and its photocatalytic activity
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The solvothermal synthesis of novel β-Bi2O3/(BiO)4(OH)2CO3 heterojunctions and its photocatalytic activity
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Journal Article
The solvothermal synthesis of novel β-Bi2O3/(BiO)4(OH)2CO3 heterojunctions and its photocatalytic activity
2020
Overview
β-Bi
2
O
3
/(BiO)
4
(OH)
2
CO
3
composite was first prepared by using NaBiO
3
·2H
2
O as a precursor via solvothermal method. X-ray diffraction, scanning electron microscope, high-resolution transmission electron microscope, and UV–Vis diffuse reflectance spectrum have been used to characterize the composite material. It was found that the volume ratio of ethanol to water plays a vital role in the formation of (BiO)
4
(OH)
2
CO
3
and the formation mechanism of β-Bi
2
O
3
/(BiO)
4
(OH)
2
CO
3
composite has been investigated in this paper. Additionally, the as-prepared β-Bi
2
O
3
/(BiO)
4
(OH)
2
CO
3
heterojunction exhibited superior photocatalytic activity for the degradation of contaminants. 91.1% of Rhodamine B (RhB), 81.6% of Congo red, and 89.4% of tetracycline hydrochloride (TC) can be degraded in 70 min, 180 min and 160 min under the simulated sunlight irradiation, respectively. Furthermore, the apparent rate constant values of β-Bi
2
O
3
/(BiO)
4
(OH)
2
CO
3
are approximately 10 times that of β-Bi
2
O
3
and about 3 times that of (BiO)
4
(OH)
2
CO
3
. 75.9% of RhB can still be degraded by Bi
2
O
3
/(BiO)
4
(OH)
2
CO
3
in the process of third cycling run. The trapping experiments of active species indicated that holes (h
+
) and superoxide radicals (·O
2
−
) were the major active species during the degradation process. This study provides new insights into design and synthesis of heterojunction photocatalysts for environmental remediation.
Publisher
Springer US,Springer Nature B.V
