Beneficial synergy of adsorption–intercalation–conversion mechanisms in Nb2O5@nitrogen-doped carbon frameworks for promoted removal of metal ions via hybrid capacitive deionization,Environmental Science: Nano

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Beneficial synergy of adsorption–intercalation–conversion mechanisms in Nb2O5@nitrogen-doped carbon frameworks for promoted removal of metal ions via hybrid capacitive deionization
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-12-8 , DOI: 10.1039/d0en01003k
Guizhi Wang _{1,

2,

3,

4,

5} , Tingting Yan _{1,

2,

3,

4,

5} , Junjie Shen _{6,

7,

8,

9} , Jianping Zhang _{1,

2,

3,

4,

5} , Liyi Shi _{1,

2,

3,

4,

5} , Dengsong Zhang _{1,

2,

3,

4,

5}

Affiliation

Capacitive deionization (CDI) is an emerging water purification technology, but the ion adsorption capacity of traditional carbon-based CDI electrodes is still unsatisfactory. Herein, a novel faradaic electrode by anchoring Nb₂O₅ nanoparticles on nitrogen-doped carbon frameworks as anodes and activated carbon (AC) as cathodes in a hybrid capacitive deionization (HCDI) system was originally developed to capture Na⁺ ions via adsorption–intercalation–conversion mechanisms. The synergistic effects of the nanostructure and carbon coating were beneficial to enhancing electrical conductivity and offering fast Na⁺ ion diffusion pathways. Impressively, the HCDI system demonstrated an excellent ion adsorption capacity of 35.4 mg g⁻¹ in a 500 mg L⁻¹ NaCl solution at 1.2 V as well as stable regeneration ability. In situ Raman and ex situ XPS measurements unraveled that the mechanism of ion removal from water was the reversible redox reaction of Nb₂O₅. The new overall understanding of the synergistic effects opens opportunities for the design of HCDI systems for efficient removal of metal ions from saline water.

中文翻译：

Nb2O5 @氮掺杂碳骨架中吸附-嵌入-转化机理的有益协同作用，通过混合电容去离子促进金属离子的去除

电容去离子（CDI）是一种新兴的水净化技术，但是传统的碳基CDI电极的离子吸附能力仍不令人满意。在此，最初开发了一种新型的法拉第电极，该电极通过在混合电容去离子（HCDI）系统中将Nb ₂ O ₅纳米颗粒锚定在掺杂氮的碳骨架上作为阳极，将活性炭（AC）锚定在阴极上，最初是通过吸附-嵌入来捕获Na ⁺离子的。 –转换机制。纳米结构和碳涂层的协同作用有利于增强导电性并提供快速的Na ⁺离子扩散途径。令人印象深刻的是，HCDI系统在1.2 V的500 mg L ^-1 NaCl溶液中具有35.4 mg g ^-1的出色离子吸附能力，并具有稳定的再生能力。原位拉曼光谱和异位XPS测量结果表明，从水中去除离子的机理是Nb ₂ O ₅可逆的氧化还原反应。对协同效应的新的整体理解为设计HCDI系统提供了机会，该系统可从盐水中有效去除金属离子。

更新日期：2020-12-20

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