利用PEDOT:PSS作为电子介质增强流动电极电容去离子除盐

IF 12.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-05-31 DOI:10.1016/j.watres.2025.123940

Nguyen Anh Thu Tran , Tran Minh Khoi , Jingoo Kim , Kimin Chae , Yuna Shin , Wook Ahn , Young-Woo Lee , Huu Thang Nguyen , Thi Ngoc Tram Le , Yun Ho Kim , Seung Woo Lee , Younghyun Cho

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引用次数: 0

摘要

电容式去离子（CDI）是一种节能环保的海水淡化技术，通过在多孔电极上的电吸附去除盐离子。具体来说，由于悬浮活性炭（AC）颗粒的连续流动，使用可流动电极（FCDI）的CDI可以实现连续脱盐而无需排放。然而，其除盐性能受到交流颗粒间电连通性不足的限制。为了克服这一缺点，我们将聚（3,4-乙烯二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS），一种众所周知的导电聚合物，具有优异的导电性，高稳定性和与水环境的良好相容性，引入到水浆电极中，在交流颗粒之间形成有效的电桥。而不是作为一个主要的离子吸收材料，PEDOT:PSS功能作为一个电子介质，加强电荷转移和离子电吸附内的流动电极。此外，采用电导率优化掺杂策略，最大限度地提高了PEDOT:PSS的电子中介能力。这种简单且可扩展的方法显着将除盐效率从18.05%（原始AC）提高到61.57%，提高了3.4倍以上，而平均除盐率（ASRR）在高能效下提高了3.6倍以上。这些结果证明了PEDOT:PSS作为电子介质在FCDI中的新应用，提供了一种低复杂性但高效的策略来克服传统流动电极的导电性限制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Enhanced salt removal in flow-electrode capacitive deionization using PEDOT:PSS as an electron mediator

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Enhanced salt removal in flow-electrode capacitive deionization using PEDOT:PSS as an electron mediator

Capacitive deionization (CDI) is an energy‐efficient and environment-friendly water desalination technology that removes salt ions via electrosorption on porous electrodes. Specifically, CDI using flowable electrodes (FCDI) enables continuous desalination without needing discharging, due to the continuous flow of suspended activated carbon (AC) particles. However, its salt removal performance is limited by the insufficient interparticle electrical connectivity between AC particles. To overcome this drawback, we introduce poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), a well-known conducting polymer with excellent electrical conductivity, high stability, and good compatibility with aqueous environments, into the aqueous slurry electrode to form efficient electrical bridges among AC particles. Rather than serving as a primary ion-sorbing material, PEDOT:PSS functions as an electron mediator, enhancing charge transfer and ion electrosorption within the flow electrode. Furthermore, a conductivity-optimized doping strategy was employed to maximize the electron mediation capability of PEDOT:PSS. This simple and scalable approach significantly improved salt removal efficiency from 18.05 % (pristine AC) to 61.57 %-an enhancement of over 3.4 times-while the average salt removal rate (ASRR) increased by 3.6 times with high energy efficiency. These results demonstrate a novel application of PEDOT:PSS as an electron mediator in FCDI, offering a low-complexity yet highly effective strategy to overcome conductivity limitations of conventional flow electrodes.

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.