Photocatalytic O-2 activation enhancement and algae inactivation mechanism of BiO2-x/Bi3NbO7 van der Waals heterojunction

Xu, Dongyu ¹Li, Geng ²Dong, Yilin ¹Wang, Qiuwen ¹Zhang, Jie ¹Yang, Tongsa ¹Pang, Shaoxuan ¹Zhang, Guangming ¹Lv, Longyi ¹Xia, Yuguo ³Ren, Zhijun ¹Wang, Pengfei¹

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作者信息

1. Hebei Univ Technol
2. Natl Supercomp Ctr Tianjin
3. Shandong Univ
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Abstract

The removal of algae by reactive oxygen species (ROS) through photocatalytic O-2 activation is still a challenge. Herein, we constructed a van der Waals (VDW) heterojunction photocatalyst by coupling BiO2-x with Bi3NbO7 for photocatalytic inactivation of Microcystic aeruginosa and photodegradation of Microcystin-LR. The oxygen vacancies in BiO2-x/Bi3NbO7 can effectively promote the chemisorption of O-2, and the VDW force can drive the photoelectrons in Bi3NbO7 transfer to BiO2-x through S-scheme transfer path, resulting more electrons reduce O-2 to center dot O-2(-). Hence, photocatalytic inactivation of algae by BiO2-x/Bi3NbO7 is 14.17 and 19.05 times higher than BiO(2-x)and Bi3NbO7, respectively. During the photocatalysis, the center dot O-2(-) damages the antioxidant system and cell membrane of algae, resulting in the release of organic matter and Microcystin-LR and finally causing the death of algae. The three-dimensional fluorescence spectroscopy indicates BiO2-x/Bi3NbO7 can further availably photo-degrade the organic matter, and four possible photodegradation pathways of MC-LR are proposed.

Key words

Photocatalytic oxygen activation/BiO2-x /Bi3NbO7/Van der Waals heterojunction/Algae inactivation/Reactive oxygen species/DEGRADATION

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量24

参考文献量34

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