A newly synthesized highly stable Ag/N-carbon electrode for enhanced desalination by capacitive deionization,Environmental Science: Nano

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A newly synthesized highly stable Ag/N-carbon electrode for enhanced desalination by capacitive deionization
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-08-27 , DOI: 10.1039/d0en00826e
Yingjie He _{1,

2,

3,

4,

5} , Lei Huang _{1,

2,

3,

4,

5} , Yixian Zhao _{1,

2,

3,

4,

5} , Weichun Yang _{1,

2,

3,

4,

5} , Taixu Hao _{1,

2,

3,

4,

5} , Bichao Wu _{1,

2,

3,

4,

5} , Haoyu Deng _{1,

2,

3,

4,

5} , Dun Wei _{1,

2,

3,

4,

5} , Haiying Wang _{1,

2,

3,

4,

5} , Jian Luo _{6,

7,

8,

9}

Affiliation

Capacitive deionization (CDI) by Ag@C electrodes is a promising desalination technology for chlorine removal because there is no waste flow and no additional chemicals used during the removal and regeneration/cleaning processes. However, its efficacy and capacity are significantly limited by the low stability of Ag/C composites during the electrochemical process. In this study, we synthesized a new highly stable structure of Ag@C composites (named as Ag/N-CNP) through reductive adsorption of Ag⁺ by a polyaromatic amine followed by carbonization. We used in situ Raman spectroscopy, for the first time, to monitor in real-time the Cl⁻ electrosorption/desorption process of Ag/N-CNP electrodes, which revealed that the stability of Ag@C electrodes was mainly controlled by the dissolution of Ag. The newly synthesized Ag–N_x structure stabilized Ag nanoparticles and uniformly distributed Ag species on the carbon matrix, which resulted in a high affinity for Cl⁻ and significantly improved cyclic dechlorination performance. Results showed that the electrosorption capacity of the newly synthesized Ag/N-CNP electrodes could reach 75.3 mg g⁻¹, substantially higher than that of traditional carbon electrodes. Moreover, such a capacity had almost no loss (only 1.4% loss) after 50 continuous treatment cycles and could still retain 76% after 100 cycles, demonstrating a highly reliable and cost-effective desalination performance significantly superior to that of previously reported Ag@C electrodes.

中文翻译：

一种新合成的高度稳定的Ag / N-碳电极，可通过电容去离子增强脱盐

Ag @ C电极的电容去离子（CDI）是一种有前途的脱氯技术，用于去除氯气，因为在去除和再生/清洁过程中没有废物流，也没有使用其他化学物质。但是，其功效和容量受到电化学过程中Ag / C复合材料低稳定性的明显限制。在这项研究中，我们通过聚芳香胺对Ag ⁺的还原吸附，然后进行碳化，合成了一种新的高度稳定的Ag @ C复合材料结构（称为Ag / N-CNP）。我们使用原位拉曼光谱，首次在实时CI至监控^-Ag / N-CNP电极的电吸附/解吸过程表明Ag @ C电极的稳定性主要受Ag的溶解控制。新合成的Ag-N _X结构稳定化的银纳米颗粒和碳基体，这导致对氯的亲和性高均匀分布的银物种^-和显著改善的循环性能脱氯。结果表明，新合成的Ag / N-CNP电极的电吸附能力可达75.3 mg g ^-1，大大高于传统的碳电极。此外，这种容量在连续50个处理周期后几乎没有损失（仅损失1.4％），并且在100个周期后仍可以保留76％，证明了高度可靠且具有成本效益的脱盐性能明显优于先前报道的Ag @ C电极。

更新日期：2020-10-17

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