Nitrogen-oxygen defect engineering enhanced intrinsic electric field in CoFe2O4/g-C3N4 heterojunctions for photocatalytic tetracycline degradation and H2 evolution

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering Pub Date : 2024-09-20 DOI:10.1016/j.jece.2024.114202

Wentao Miao , Wei He , Lei Shen , Yuguang Li , Zheng Fang , Zhao Yang , Guo Kai

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引用次数: 0

Abstract

A range of efficient g-C₃N₄/CoFe₂O₄ heterojunction with nitrogen deficiencies (NDs) and oxygen deficiencies (ODs) were successfully synthesized through doping-melting and hydrothermal methods. Nitrogen-oxygen defect engineering effectively enhanced the active sites on the catalyst surface and regulated the optical bandgap, band structure, and work function (Φ) of g-C₃N₄ and CoFe₂O₄, regulating the strength of the intrinsic electric field (IEF) and promoting the separation of photo-generated carriers at the heterojunction interface. Among the series of samples, CH-H2@CFO-A5 (properly oxalate-doped g-C₃N₄/CoFe₂O₄ heterojunctions treated with prolonged annealing) demonstrated remarkable optical properties due to its narrowest optical band gap, while the strongest IEF and redox potential make it has strong carrier dynamics and photocatalytic efficiency. Under visible light, the mineralization rate of tetracycline (TC) on CH-H2@CFO-A5 and the photocatalytic hydrogen production rate were 4.51 times and 2.72 times higher than that of unmodified CN-H0@CFO-A1, respectively. This study aimed to provide an efficient strategy for regulating the IEF within the heterojunction, by altering the Fermi level through multi-element defect engineering.

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氮氧缺陷工程增强 CoFe2O4/g-C3N4 异质结中的本征电场，用于光催化四环素降解和 H2 演化

通过掺杂熔融法和水热法，成功合成了一系列具有缺氮（ND）和缺氧（OD）的高效 g-C3N4/CoFe2O4 异质结。氮氧缺陷工程有效地增强了催化剂表面的活性位点，调节了 g-C3N4 和 CoFe2O4 的光带隙、能带结构和功函数（Φ），调节了本征电场（IEF）的强度，促进了异质结界面上光生载流子的分离。在这一系列样品中，CH-H2@CFO-A5（经长时间退火处理的适当掺杂草酸盐的 g-C3N4/CoFe2O4 异质结）因其最窄的光带隙而表现出显著的光学特性，而最强的本征电场和氧化还原电位使其具有很强的载流子动力学和光催化效率。在可见光下，CH-H2@CFO-A5 上的四环素（TC）矿化率和光催化产氢率分别是未改性 CN-H0@CFO-A1 的 4.51 倍和 2.72 倍。该研究旨在通过多元素缺陷工程改变费米级，为调节异质结内的 IEF 提供一种有效的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Environmental Chemical Engineering Environmental Science-Pollution

CiteScore

11.40

自引率

6.50%

发文量

2017

审稿时长

27 days

期刊介绍： The Journal of Environmental Chemical Engineering (JECE) serves as a platform for the dissemination of original and innovative research focusing on the advancement of environmentally-friendly, sustainable technologies. JECE emphasizes the transition towards a carbon-neutral circular economy and a self-sufficient bio-based economy. Topics covered include soil, water, wastewater, and air decontamination; pollution monitoring, prevention, and control; advanced analytics, sensors, impact and risk assessment methodologies in environmental chemical engineering; resource recovery (water, nutrients, materials, energy); industrial ecology; valorization of waste streams; waste management (including e-waste); climate-water-energy-food nexus; novel materials for environmental, chemical, and energy applications; sustainability and environmental safety; water digitalization, water data science, and machine learning; process integration and intensification; recent developments in green chemistry for synthesis, catalysis, and energy; and original research on contaminants of emerging concern, persistent chemicals, and priority substances, including microplastics, nanoplastics, nanomaterials, micropollutants, antimicrobial resistance genes, and emerging pathogens (viruses, bacteria, parasites) of environmental significance.