Controllable morphology CoFe2O4/g-C3N4 p-n heterojunction photocatalysts with built-in electric field enhance photocatalytic performance

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2022-06-05 DOI:10.1016/j.apcatb.2022.121107

Wei He , Liang Liu , Tingting Ma , Huimin Han , Jiajing Zhu , Yingpei Liu , Zheng Fang , Zhao Yang , Kai Guo

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Abstract

CoFe₂O₄/g-C₃N₄ p-n heterojunction photocatalysts have been successfully synthesized. The formation of p-n heterojunction and the unique morphology of g-C₃N₄ enhanced electron transfer and charge separation, leading to a significant improvement in photocatalytic efficiency. 5-CoFe₂O₄/CNS not only had a high photocatalytic hydrogen evolution rate of 18.9 mmol·g⁻¹·h⁻¹, but also possessed an efficient photocatalytic fluoroquinolone antibiotics removal efficiency. A smaller band gap in 5-CoFe₂O₄/CNS photocatalyst promoted more light generated electrons under visible light irradiation. An internal electric field at the contact interface accelerated the accumulation of electrons and holes in the valence band of g-C₃N₄ and conduction band of CoFe₂O₄, thereby revealing a higher separation efficiency and noticeable inhibited recombination rate of the photoinduced electrons and holes. Also, improved removal efficiency for fluoroquinolone antibiotics was attained in the self-designed acousto-optic microreactor, which was 7.2 and 30 times higher than quartz glass tube and batch experiment, respectively.

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可控形态的CoFe2O4/g-C3N4 p-n异质结光催化剂内置电场增强了光催化性能

成功合成了CoFe2O4/g-C3N4 p-n异质结光催化剂。p-n异质结的形成和g-C3N4独特的形态增强了电子转移和电荷分离，导致光催化效率显著提高。5-CoFe2O4/CNS不仅具有18.9 mmol·g−1·h−1的高光催化析氢速率，而且具有高效的光催化氟喹诺酮类抗生素脱除效率。5-CoFe2O4/CNS光催化剂的带隙越小，在可见光照射下产生的电子越多。接触界面处的内部电场加速了g-C3N4的价带和CoFe2O4的导带中电子和空穴的积累，从而显示出更高的分离效率，并明显抑制了光致电子和空穴的复合速率。自行设计的声光微反应器对氟喹诺酮类抗生素的去除率比石英玻璃管和批量实验分别提高7.2倍和30倍。

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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.