BiO2−x/Bi3NbO7 van der Waals异质结光催化O2活化增强及藻类失活机理

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2022-09-05 DOI:10.1016/j.apcatb.2022.121402

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

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引用次数: 20

摘要

通过光催化O2活化活性氧(ROS)去除藻类仍然是一个挑战。本研究通过将bi2−x与Bi3NbO7偶联，构建了一种van der Waals (VDW)异质结光催化剂，用于微囊铜绿菌的光催化失活和微囊藻素- lr的光降解。Bi3NbO7中的氧空位可以有效促进O2的化学吸附，VDW力可以驱动Bi3NbO7中的光电子通过S-scheme转移路径向BiO2 - x转移，导致更多的电子将O2还原为·O2-。因此，BiO2−x/Bi3NbO7对藻类的光催化失活效果分别是BiO2−x和Bi3NbO7的14.17倍和19.05倍。在光催化过程中，·O2-破坏藻类的抗氧化系统和细胞膜，导致有机物和微囊藻毒素lr的释放，最终导致藻类死亡。三维荧光光谱分析表明，BiO2−x/Bi3NbO7可以进一步有效地光降解有机物，并提出了MC-LR的四种可能的光降解途径。

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Photocatalytic O2 activation enhancement and algae inactivation mechanism of BiO2−x/Bi3NbO7 van der Waals heterojunction

The removal of algae by reactive oxygen species (ROS) through photocatalytic O₂ activation is still a challenge. Herein, we constructed a van der Waals (VDW) heterojunction photocatalyst by coupling BiO_2−x with Bi₃NbO₇ for photocatalytic inactivation of Microcystic aeruginosa and photodegradation of Microcystin-LR. The oxygen vacancies in BiO_2−x/Bi₃NbO₇ can effectively promote the chemisorption of O₂, and the VDW force can drive the photoelectrons in Bi₃NbO₇ transfer to BiO_2−x through S-scheme transfer path, resulting more electrons reduce O₂ to·O₂^-. Hence, photocatalytic inactivation of algae by BiO_2−x/Bi₃NbO₇ is 14.17 and 19.05 times higher than BiO_2−x and Bi₃NbO₇, respectively. During the photocatalysis, the·O₂^- 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 BiO_2−x/Bi₃NbO₇ can further availably photodegrade the organic matter, and four possible photodegradation pathways of MC-LR are proposed.

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.