A 3D porous MnHCF/MXene electrode for enhanced deionization performance in high-salinity water

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL Separation and Purification Technology Pub Date : 2025-02-06 DOI:10.1016/j.seppur.2025.131986

Hang Wang, Yujie Zhang, Yuchen Shi, Jiatong Ma, Ning Cai, Juanqin Xue, Haodi Song

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Abstract

Capacitive deionization (CDI) technology shows great potential for the treatment of high-salinity wastewater generated by coal chemical industries. MXene has gained significant attention as a potential material for CDI applications, but the stacking of MXene layers limits its application. Thus, the MnHCF/MXene composite material with 3D porous structure was designed and prepared. The results showed that MnHCF/MXene composite with 3D okra-like structure was successfully synthesized, and the specific surface area was 84 m²/g, average pore diameter was 20 nm, and a pore volume was 0.47 cm³ g⁻¹, which were all better than those of MXene. These results highlighted a significantly enhanced porous structure. Furthermore, the composite exhibited an outstanding capacitance of 187.7F/g, and a low charge transfer resistance of 0.57 O cm² s⁻¹, indicating excellent ion diffusion and electrochemical performance. The CDI experimental results showed that the composite electrode has an excellent desalination performance with 177.12 mg/g of desalination capacity, 9.84 mg/g min⁻¹ of desalination rate and only 0.58 Wh/g of energy consumption. The results of stability experiments shown that the specific capacitance of the MnHCF/MXene electrode retained 93.13 % and 91.31 % in CV and GCD during 150 cycles, respectively.This study provides valuable insights into the strategic structural design of advanced desalination materials and offers critical data to support the application of CDI technology in the treatment of high-salinity wastewater.

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电容式去离子（CDI）技术在处理煤化工产生的高含盐废水方面具有巨大潜力。作为一种潜在的 CDI 应用材料，MXene 已受到广泛关注，但 MXene 层的堆叠限制了其应用。因此，我们设计并制备了具有三维多孔结构的 MnHCF/MXene 复合材料。结果表明，成功合成了具有三维秋葵状结构的 MnHCF/MXene 复合材料，其比表面积为 84 m2/g，平均孔径为 20 nm，孔体积为 0.47 cm3 g-1，均优于 MXene。这些结果凸显了多孔结构的明显增强。此外，该复合材料还表现出 187.7F/g 的出色电容和 0.57 O cm2 s-1 的低电荷转移电阻，表明其具有出色的离子扩散和电化学性能。CDI 实验结果表明，该复合电极具有优异的脱盐性能，脱盐容量为 177.12 mg/g，脱盐率为 9.84 mg/g min-1，能耗仅为 0.58 Wh/g。稳定性实验结果表明，MnHCF/MXene 电极的比电容在 150 个循环的 CV 和 GCD 中分别保持了 93.13% 和 91.31%。这项研究为先进海水淡化材料的战略性结构设计提供了宝贵的见解，并为 CDI 技术在高盐度废水处理中的应用提供了关键数据支持。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.