Metal-alcohol coordination promoted reduction of bismuth (III) in bismuth-based semiconductors for enhanced photocatalytic activity

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2023-12-22 DOI:10.1016/j.apcatb.2023.123652

Haiping Li , Guoan Wang , Quanhua Deng , Wenxuan Hu , Wanguo Hou

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Abstract

Metal ion doping is an extensively researched method to enhance photocatalytic activity of bismuth-based semiconductors, but function of the metal ions need be further clarified. Herein, metal-alcohol coordination was evidenced to promote reduction of Bi^III in Bi-based semiconductors (e.g., Bi₂MoO₆ hierarchical microspheres) to generated oxygen vacancies (Ovs) and Bi metal (Bi⁰). Ovs and Bi⁰, rather than widely recognized doping metal ions, play a key role for remarkable enhancement of photocatalytic activity of Bi₂MoO₆, for example of ∼16-fold higher photocatalytic nitrogen reduction activity, which arises from that the Ovs and Bi⁰ can enhance photoexcited charge separation and work as surface active sites. The Ovs possess much greater efficacy than the Bi⁰. Formation of Bi⁰ also induces prominent morphological variation of the microspheres. This work discloses an interesting but neglected phenomenon in alcohothermal synthesis of “metal-doped” Bi-based semiconductors and aims at drawing high attention of relevant researchers.

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金属醇配位促进铋基半导体中铋（III）的还原，从而提高光催化活性

金属离子掺杂是一种被广泛研究的提高铋基半导体光催化活性的方法，但金属离子的功能需要进一步明确。本文证明，金属醇配位可促进铋基半导体（如 Bi2MoO6 分层微球）中铋Ⅲ的还原，生成氧空位（Ovs）和铋金属（Bi0）。Ovs 和 Bi0，而不是公认的掺杂金属离子，在显著提高 Bi2MoO6 的光催化活性方面发挥了关键作用，例如，其光催化还氮活性提高了 16 倍，这是因为 Ovs 和 Bi0 能够增强光激发电荷分离并作为表面活性位点发挥作用。Ovs 比 Bi0 具有更高的功效，而 Bi0 的形成也会导致微球出现明显的形态变化。这项研究揭示了 "掺金属 "Bi 基半导体醇热合成中一个有趣但被忽视的现象，旨在引起相关研究人员的高度重视。

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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.