Synergistic Polarization and Oxygen Vacancies Engineering for Enhancing Photocatalytic NO Removal over Bi4Ti3O12 Nanowires

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2024-01-15 DOI:10.1016/j.apcatb.2024.123734

Qiuhui Zhu, Yu Wang, Junjun Wang, Jianmin Luo, Jingsan Xu, Chuanyi Wang

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Abstract

Enhanced polarization emerges as a potent strategy for further enhancing the photocatalytic performance of a photocatalyst. Considering the anisotropy of ferroelectric polarization and the improvement of polarization by defects, [010] preferred growth Bi₄Ti₃O₁₂ nanowires with oxygen vacancies were prepared via a hydrothermal method. Bi₄Ti₃O₁₂ nanowires exhibited a photocatalytic NO removal efficiency of up to 67.5% under visible light irradiation (λ > 420 nm), which is much higher than that of its counterpart, Bi₄Ti₃O₁₂ (3%). Structural characterizations and theoretical calculations support that, the engineering of oxygen vacancies in Bi₄Ti₃O₁₂ can enhance the polarization in the [010] and [100] directions, and gradually shifted the polarization dominant direction of Bi₄Ti₃O₁₂ from [100] to [010]. Overall, the improved polarization and generated oxygen vacancies enhanced the photocatalytic NO removal performance of Bi₄Ti₃O₁₂ nanowires. This work elucidates the significance of rational engineering oxygen vacancy-based microstructures and utilizing the polarization to amplify the photocatalytic performance.

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增强 Bi4Ti3O12 纳米线光催化去除氮氧化物的极化和氧空位工程协同作用

增强极化是进一步提高光催化剂光催化性能的有效策略。考虑到铁电极化的各向异性以及缺陷对极化的改善作用，[010] 通过水热法制备了具有氧空位的优先生长 Bi4Ti3O12 纳米线。在可见光（λ > 420 nm）照射下，Bi4Ti3O12 纳米线对 NO 的光催化去除率高达 67.5%，远高于其对应的 Bi4Ti3O12（3%）。结构表征和理论计算证明，Bi4Ti3O12 中的氧空位工程可以增强[010]和[100]方向的极化，并逐渐将 Bi4Ti3O12 的极化主导方向从[100]转移到[010]。总体而言，极化的改善和氧空位的产生提高了 Bi4Ti3O12 纳米线光催化去除 NO 的性能。这项工作阐明了合理设计基于氧空位的微结构以及利用极化来提高光催化性能的意义。

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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.