Spatial confinement on activated carbon enables uniformly dispersed FeOOH for stable capacitive defluoridation

IF 9.9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2026-06-01 Epub Date: 2026-02-26 DOI:10.1016/j.desal.2026.120027

Chulei Zhao , Dongxu Chen , Jiao Yin , Hui Zhu

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引用次数: 0

Abstract

This study addresses the challenges of active site agglomeration and insufficient cycling stability of iron oxyhydroxide (FeOOH) when used as an electrode material in capacitive deionization (CDI). A composite preparation strategy was proposed, which combines ultrasonic-assisted precursor uniform dispersion, urea-regulated crystallization, and hydrothermal in-situ growth. This approach successfully constructed a FeOOH@AC composite electrode featuring highly dispersed FeOOH nanoflowers on an activated carbon (AC) substrate. The spatial confinement effect of AC was utilized to effectively inhibit the agglomeration of FeOOH and alleviate volume expansion during cycling. Experimental results demonstrated that the prepared FeOOH@AC electrode exhibited a high salt adsorption capacity of 80.2 mg·g⁻¹ during the CDI defluoridation process and retained over 90% of its capacity after 100 cycles, significantly outperforming most reported fluoride adsorbent materials. This work provides a material design strategy for constructing fluoride ion capture electrodes with high ion accessibility, rapid charge transfer, and long-term cycling stability.

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空间限制上的活性炭使均匀分散的FeOOH稳定的电容除氟

本研究解决了氢氧化铁（FeOOH）作为电容去离子（CDI）电极材料时活性位点团聚和循环稳定性不足的问题。提出了超声辅助前驱体均匀分散、尿素调控结晶和水热原位生长相结合的复合制备策略。该方法在活性炭（AC）衬底上成功构建了具有高度分散的FeOOH纳米花的FeOOH@AC复合电极。利用活性炭的空间约束效应，有效抑制FeOOH的团聚，缓解循环过程中的体积膨胀。实验结果表明，制备的FeOOH@AC电极在CDI脱氟过程中具有80.2 mg·g−1的高盐吸附容量，并且在100次循环后仍保持90%以上的容量，显著优于大多数报道的氟吸附材料。这项工作为构建具有高离子可及性、快速电荷转移和长期循环稳定性的氟离子捕获电极提供了一种材料设计策略。

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

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.