葡萄糖衍生多孔碳的表面电荷调控与电吸附Cd2+性能

doi:10.11896/cldb.23040284

材料导报

2024, Vol. 38

Issue (6): 23040284-8 https://doi.org/10.11896/cldb.23040284

电化学能源材料与器件

葡萄糖衍生多孔碳的表面电荷调控与电吸附Cd²⁺性能

覃玲霜, 刘醒, 邓立波^*

深圳大学化学与环境工程学院,广东深圳 518055

Tailoring of the Surface Charge of Glucose-derived Porous Carbons and Their Performance for Electrosorption of Cd²⁺

QIN Lingshuang, LIU Xing, DENG Libo^*

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, Guangdong, China

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摘要电容去离子(CDI)是一种基于静电吸附的脱盐技术,由于其操作简便、能耗低、无二次污染等优点,有望用于冶金、电镀等行业所产生的废水中Cd²⁺的去除。目前限制其发展的关键难题在于电极材料对Cd²⁺的吸附容量较低。以葡萄糖为碳源,以硫脲与硫粉为掺杂剂,通过高温碳化制备了S、N共掺杂的多孔碳材料。以所制备的碳材料为电极组装了CDI系统,测试了其电吸附Cd²⁺的性能。以相同的电极材料组装的对称型CDI系统在1.2 V下对Cd²⁺的吸附容量达到53 mg·g^-1。进一步研究发现,S、N掺杂使碳材料表面带有负电荷,因此,以其为阴极、电中性的商业活性炭YP-50F为阳极组装的非对称CDI系统的吸附容量达到88.37 mg·g^-1,比对称体系高66.73%;而且经过七次吸-脱附循环后,容量保持率也由对称体系的62.2%提升至81.5%。通过XPS分析证明电极去除Cd²⁺的机理为双电层与碳材料表面官能团络合的协同作用。本工作所开发的高性能多孔碳电极及非对称电极的匹配策略有望推动CDI技术在Cd²⁺及其他重金属废水治理领域的应用。

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	覃玲霜
	刘醒
	邓立波

关键词: 电容去离子葡萄糖多孔碳镉离子表面电荷

Abstract: Capacitive deionization (CDI) is a promising technology for Cd²⁺ removal owing to the advantages such as simple and convenient operation, low energy consumption, and free of secondary pollution. The key challenge limiting its development is the low adsorption capacity of electrode materials for Cd²⁺. In this work, we used glucose as carbon source, thiourea and sulfur as the dopant to prepare porous carbon materials co-doped with S and N through high-temperature carbonization, and explored its electrochemical adsorption performance for Cd²⁺, by using the prepared carbon material as the electrode. The symmetrical CDI system assembled with identical material for both electrodes achieved a removal capacity of 53 mg·g^-1 for Cd²⁺ at 1.2 V. Furthermore, it was found that with the increase of S and N doping, the surface of carbon materials carries negative charges. Therefore, the asymmetric CDI system assembled by using it as the anode and commercial activated carbon YP-50F as the cathode, and Cd²⁺ removal capacity reached 88.37 mg·g^-1, which was 66.73% higher than symmetrical CDI system. After seven cycles of adsorption-desorption, the capacity retention rate also increased from 62.2% to 81.5%. The removal mechanism of Cd²⁺ was explored by XPS, and the results showed that it was the synergism of double electric layer and surface functional groups. The matching strategy of high-perfor-mance porous carbon electrodes and asymmetric electrodes developed in this work would pave the way for practical application of CDI technology in the treatment of Cd²⁺ and other heavy metal wastewater.

Key words: capacitive deionization glucose porous carbon cadmium surface charge

出版日期: 2024-03-25 发布日期: 2024-04-07

ZTFLH:

TB332

基金资助: 国家自然科学基金(22178223)

通讯作者: ^*邓立波,深圳大学副教授、博士研究生导师、新能源科学与工程系副主任、深圳大学优秀青年教师。主要研究领域为碳基能源材料、二次电池、高功率电容器、电催化剂及电化学金属资源回收。主持国家自然科学基金面上项目等课题;在Advanced Materials、Chemical Society Reviews等期刊发表论文120余篇,总引用6 000余次,H因子46,获授权发明专利7项,入选2019—2022年度全球前2%高被引科学家、深圳市海外高层次人才、南山区高层次人才。

作者简介: 覃玲霜,2016年6月于济南大学获得理学学士学位。现为深圳大学化学与环境工程学院硕士研究生,在邓立波副教授的指导下进行研究。目前主要研究领域为生物质衍生多孔碳电容去除镉离子。

引用本文:

覃玲霜, 刘醒, 邓立波. 葡萄糖衍生多孔碳的表面电荷调控与电吸附Cd²⁺性能[J]. 材料导报, 2024, 38(6): 23040284-8.
QIN Lingshuang, LIU Xing, DENG Libo. Tailoring of the Surface Charge of Glucose-derived Porous Carbons and Their Performance for Electrosorption of Cd²⁺. Materials Reports, 2024, 38(6): 23040284-8.

链接本文:

https://www.mater-rep.com/CN/10.11896/cldb.23040284 或 https://www.mater-rep.com/CN/Y2024/V38/I6/23040284

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