Alkali-treatment synthesis of bismuth vanadium oxide photocatalysts with different morphologies

The bismuth vanadium oxide photocatalysts with different phases and morphologies were facilely synthesized by the alkali-treatment synthesis method. BiVO4 polyhedrons as the raw materials were firstly prepared by a facile hydrothermal method. With the change of the concentrations of NaOH, the surfac...

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Bibliographic Details
Published in:Journal of solid state chemistry 2020-06, Vol.286, p.121296, Article 121296
Main Authors: Li, Wenjuan, Kong, Defen, Yan, Tingjiang, Shi, Meng, Kong, Desheng, Feng, Yuanyuan, Jing, Zhihong, You, Jinmao
Format: Article
Language:English
Subjects:
Alkali treatment
Antibacterial activity
Morphologies
Phases
Photocatalysis
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Summary:The bismuth vanadium oxide photocatalysts with different phases and morphologies were facilely synthesized by the alkali-treatment synthesis method. BiVO4 polyhedrons as the raw materials were firstly prepared by a facile hydrothermal method. With the change of the concentrations of NaOH, the surfaces of the raw BiVO4 polyhedrons became rough and then other phases appeared, such as Bi2O3 regular tetrahedrons, Bi7VO13 sheets and rods, and Bi25VO40 triangle-blocks and cuboids. When the concentration of NaOH was 0.1 ​M, the obtained samples were the composites of the polyhedral BiVO4 and regular tetrahedral Bi2O3, which exhibited the best photocatalytic activity in the degradation of several organic pollutants. From the exploration of the degradation mechanism, it showed that the transfer rate of photogenerated electron–hole pairs on the composites of BiVO4 and Bi2O3 was promoted. The h+, •OH and O2•- played key effect in the degradation process. Furthermore, the bismuth vanadium oxide photocatalysts also showed antibacterial activities towards E. coli. Different phases and morphologies of bismuth vanadium oxide photocatalysts can be controlled and adjusted by changing the amount of NaOH in the synthesis process. The polyhedral BiVO4 samples completely changed into other phases, such as Bi2O3 regular tetrahedrons, Bi7VO13 sheets and rods, and Bi25VO40 triangle-blocks and cuboids. [Display omitted] •Pure BiVO4 can be transformed into other phases such as Bi2O3, Bi7VO13 and Bi25VO40.•Polyhedrons, tetrahedrons, sheets, rods, triangle-blocks and cuboids were obtained.•Bi2O3/BiVO4 composite showed the best photocatalytic activity towards pollutants.•Transfer rate of photogenerated electron–holes between BiVO4 and Bi2O3 was promoted.•They also showed good antibacterial activities towards E. coli
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2020.121296