Biochar derived from soybean residue as an efficient cathode applied in heterogeneous electro-Fenton

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2025-04-27 DOI:10.1016/j.electacta.2025.146335

Shaofei Weng, Ting Wu, Rui Yang, Yilin Zhao, Jing Li, Zhihua Li, Weihuang Zhu

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引用次数: 0

Abstract

This study fabricated an effective cathode (Fe/Zn/BSR@CF), using Fe/Zn co-doped biochar from waste soybean residue (WSR) as the cathodic reactive component. In the electro-Fenton system equipped with the fabricated cathode, the tetracycline (TC) removal efficiency reached 93.86% within 150 min, and total organic carbon (TOC) mineralization efficiency obtained 70.73% within 6 h. The excellent cathodic performance was due to the synergistic strategies, including Fe, N, and P co-doping and specific surface area enhancement via Zn modification of biochar which inherently contained endogenous N and P. The Fe/Zn-doped biochar, characterized by a high specific surface area, facilitated the formation of pyridinic-N and iron phosphide(Fe_xP), thereby endowing the cathode with enhanced H₂O₂ generation and activation capabilities. Electron paramagnetic resonance spectrometer (EPR) test and quenching experiment results showed hydroxyl radicals (OH^•) and superoxide radicals (O₂^•⁻) were identified as the primary oxygen-containing reactive species during the electro-Fenton process. Results also indicated that O₂ was first reduced cathodically to O₂^•⁻ which subsequently combined with a proton to produce H₂O₂. Then, the generated H₂O₂ was activated by the cathodic reactive component (Fe_xP). Furthermore, ecotoxicity evaluation of TC degradation intermediates showed an overall trend toward reduced toxicity. This study presents a biochar-based cathode for the in-situ generation and activation of H₂O₂, offering an approach to improve electro-Fenton efficiency for organic pollutant removal.

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大豆渣生物炭作为高效阴极应用于非均相电fenton

本研究以废豆渣（WSR）中Fe/Zn共掺杂的生物炭作为阴极反应组分，制备了一种有效的阴极（Fe/Zn/BSR@CF）。在电极- fenton体系中，在150 min内四环素（TC）去除效率达到93.86%，6 h内总有机碳（TOC）矿化效率达到70.73%。优异的阴极性能是由于铁、氮、磷共掺杂和锌修饰生物炭提高比表面积的协同策略所致。具有高比表面积的特点，有利于吡啶- n和磷化铁（FexP）的形成，从而增强了阴极生成H2O2和活化的能力。电子顺磁共振谱仪（EPR）测试和猝灭实验结果表明，在电- fenton过程中，羟基自由基（OH•）和超氧自由基（O2•）被确定为主要的含氧反应物质。结果还表明，O2首先被阴极还原为O2•毒血症，随后与质子结合产生H2O2。然后，生成的H2O2被阴极反应成分（FexP）活化。此外，TC降解中间体的生态毒性评价总体上呈现出毒性降低的趋势。本研究提出了一种用于原位生成和活化H2O2的生物炭基阴极，为提高电fenton去除有机污染物的效率提供了一种方法。

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

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.