Plasma-enhanced vanadium-based hybrid capacitive deionization for high selective removal of Pb2+

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2023-09-01 DOI:10.1016/j.desal.2023.116657

Yan Li , Huibin Liu , Wenchao Peng , Yang Li , Fengbao Zhang , Xiaobin Fan

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引用次数: 1

Abstract

Lead ion is one of the toxic metal ions contaminants in wastewater, and its efficient removal is a critical challenge in wastewater treatment. Therefore, developing a low-cost hybrid capacitive-deionization (HCDI) technology with high adsorption capacity is imminent. Herein, we fabricated (NH₄)₂V₁₀O₂₅·8H₂O (NVO) micro flowers with large layer spacing and achieved enhanced hydrophilicity and rich oxygen vacancies by Ar plasma treatment. The plasma-treated (NH₄)₂V₁₀O₂₅·8H₂O (P-NVO) electrode exhibits high electrochemical performance (204.6 F/g at 1 A/g). Additionally, the P-NVO//active carbon (AC) cell displays a superior adsorption capacity (49.56 mg/g) than that of the NVO//AC cell in Pb(NO₃)₂) solution. The enhanced adsorption capacity can be attributed to the increased oxygen vacancies, improved hydrophilicity and ion-insertion mechanism induced by plasma treatment. More importantly, the P-NVO//AC cell holds a superior regeneration performance and excellent ion selectivity, as confirmed by experimental results and DFT calculations. Interestingly, we display the concept of aqueous lead-ion batteries based on this cell, demonstrating the potential of combining Pb²⁺ energy storage and removal. Overall, this work highlights the significance of developing high-performance technology for removing lead ions from wastewater.

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等离子体增强钒基杂化电容去离子的高选择性去除Pb2+

铅离子是废水中的有毒金属离子污染物之一，其高效脱除是废水处理中的一个关键挑战。因此，开发低成本、高吸附容量的混合电容去离子(HCDI)技术迫在眉睫。本文制备了大层间距的(NH4)2V10O25·8H2O (NVO)微花，并通过Ar等离子体处理获得了增强的亲水性和丰富的氧空位。等离子体处理的(NH4)2V10O25·8H2O (P-NVO)电极表现出较高的电化学性能(在1 A/g时为204.6 F/g)。此外，P-NVO//活性炭(AC)电池对Pb(NO3)2溶液的吸附能力(49.56 mg/g)优于NVO//AC电池。等离子体处理增加了氧空位，改善了亲水性和离子插入机制，从而增强了吸附能力。更重要的是，实验结果和DFT计算证实了P-NVO//AC电池具有优异的再生性能和离子选择性。有趣的是，我们展示了基于该电池的水性铅离子电池的概念，展示了结合Pb2+能量存储和去除的潜力。总之，这项工作强调了开发高性能去除废水中铅离子技术的重要性。

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.