Enhanced fluoride removal through pulsed electrosorption: Optimizing energy efficiency and selectivity in complex water matrices by EDL regulation

IF 13.2 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-06-08 DOI:10.1016/j.cej.2025.164597

Xun Liu , Chaoqun Zhu , Mengxia Wang , Yufei Shu , Meng Zhang , Weiwen Chen , Beizhao Chen , Siyu Cao , Rui Chen , Zhongying Wang

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引用次数: 0

Abstract

As environmental regulations become increasingly stringent and freshwater scarcity continues to escalate, the efficient and selective removal of fluoride ions (F⁻) from various water sources has become a critical challenge. This study systematically investigates the role of pulsed voltage (PV) parameters in optimizing fluoride (F⁻) removal using a CeO₂ electrode. By modulating pulse period, duty cycle, and voltage intensity, we achieved 9.1 % improvement in fluoride removal kinetics (0.6 mg/g·h vs. 0.55 mg/g·h) and 25.2 % enhancement in charge efficiency compared to the constant voltage mode for treating 0.25 mM F⁻ and 2.5 mM Cl⁻ solutions. A transient diffusion model reveals that pulsed conditions enhance ion replenishment dynamics, maintaining higher fluoride concentrations at the electrode surface. Real-time electrochemical quartz crystal microbalance (EQCM) measurements confirm that PV mode reduces non-specific ion adsorption and optimizes electric double layer (EDL) formation, minimizing energy dissipation. Furthermore, the effectiveness of the PV mode is validated under high-pH conditions, the presence of various anions, and real groundwater samples, highlighting its practical applicability. This study establishes PV electrosorption as an energy-efficient alternative for selective ion removal, paving the way for more sustainable electrochemical water treatment technologies. These findings provide a solid theoretical and experimental foundation for scaling up electrosorption processes, supporting broader applications in industrial and environmental engineering.

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通过脉冲电吸附增强氟化物去除：通过EDL调节优化复杂水基质的能量效率和选择性

随着环境法规日益严格和淡水短缺持续升级，从各种水源中有效和选择性地去除氟离子（F -）已成为一项重大挑战。本研究系统地研究了脉冲电压（PV）参数在优化CeO2电极去除氟（F−）中的作用。通过调制脉冲周期、占空比和电压强度，与恒电压模式相比，处理0.25 mM F -和2.5 mM Cl -溶液时，我们的除氟动力学提高了9.1 %(0.6 mg/g·h vs. 0.55 mg/g·h)，充电效率提高了25.2 %。瞬态扩散模型表明，脉冲条件增强离子补充动力学，在电极表面保持较高的氟化物浓度。实时电化学石英晶体微天平（EQCM）测量证实，PV模式减少了非特异性离子吸附，优化了双电层（EDL）的形成，最大限度地减少了能量消耗。此外，在高ph条件下、阴离子存在条件下以及实际地下水样品中验证了PV模式的有效性，突出了PV模式的实用性。本研究确立了PV电吸附作为选择性离子去除的节能替代方法，为更可持续的电化学水处理技术铺平了道路。这些发现为扩大电吸附过程提供了坚实的理论和实验基础，支持在工业和环境工程中的更广泛应用。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.