Efficient remediation and synchronous recovery of uranium by phosphate-functionalized magnetic carbon-based flow electrode capacitive deionization

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-04-22 DOI:10.1016/j.watres.2025.123707

De Wang , Jing Wang , Di Zhang , Jiaxing Li

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Abstract

Through the design of flow electrodes, flow electrode capacitive deionization (FCDI) enables the efficient remediation of uranium-contaminated water to meet World Health Organization (WHO) standards (uranium ≤ 30 ppb), while concurrently facilitating the recovery of uranium from the flow electrode slurry. In this work, the phosphate-functionalized magnetic carbon-based flow electrode (OMPAC) was synthesized by simply co-precipitation and oxygen plasma treatment. The enhanced conductivity of OMPAC accelerated the efficient remediation of surface water contaminated with multiple nuclides, due to the improved charge-transfer capability facilitated by the introduced magnetic particles (Fe, Fe₃O₄, Fe₃C) and heteroatoms (O, P). The uranium in feed solution was selectively adsorbed by OMPAC in flow electrode slurry, benefiting from the multiple strong sorption interactions between U(VI) and C=O/P=O/P–O groups, as well as the redox reactions between U(VI) and Fe (0/II). After four batch cycles, the average uranium removal rate by OMPAC was maintained at 97.84 %, while the recovery rate of uranium from OMPAC reached 78.2 %, demonstrating the excellent long-term performance and synchronous uranium recovery capability in FCDI. This study provides feasibility guidance for the remediation of radioactive pollution and the strategic reuse of resources via the FCDI technology.

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利用磷酸盐功能化磁性碳基流动电极电容式去离子法高效修复和同步回收铀

通过流动电极的设计，流动电极电容去离子（FCDI）能够有效地修复铀污染水，使其达到世界卫生组织（WHO）的标准（铀≤30 ppb），同时有利于从流动电极浆中回收铀。本文采用简单共沉淀法和氧等离子体处理法制备了磷酸盐功能化磁性碳基流动电极（OMPAC）。由于引入磁性粒子（Fe, Fe3O4, Fe3C）和杂原子（O， P），提高了电荷转移能力，OMPAC的电导率增强加速了对多种核素污染地表水的有效修复。流动电极浆中铀被OMPAC选择性吸附，这主要是由于U（VI）和C=O/P=O /P - O基团之间的多重强吸附作用。以及U（VI）和Fe （0/II）之间的氧化还原反应。经过4个批次循环后，OMPAC的平均铀去除率保持在97.84%，而OMPAC的铀回收率达到78.2%，显示了优良的长期性能和在FCDI中同步回收铀的能力。本研究为利用FCDI技术进行放射性污染的修复和资源的战略性回用提供了可行性指导。

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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.