CIESC Journal ›› 2022, Vol. 73 ›› Issue (4): 1763-1771.DOI: 10.11949/0438-1157.20211793

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Carbon electrodes modified with water-soluble charged polymer binder for enhanced capacitive deionization performance

Gang WANG1,2(),Xiaoping CHE2,Shiyong WANG1,Jieshan QIU2()   

  1. 1.School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, China
    2.State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory for Energy Materials and Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2021-12-20 Revised:2022-01-26 Online:2022-04-25 Published:2022-04-05
  • Contact: Jieshan QIU

水溶性带电聚合物黏结剂修饰炭电极用于增强电容去离子性能

王刚1,2(),车小平2,汪仕勇1,邱介山2()   

  1. 1.东莞理工学院生态环境与建筑工程学院,广东 东莞 523808
    2.大连理工大学化工学院,精细化工国家重点实验室,辽宁省能源材料化工重点实验室,辽宁 大连 116024
  • 通讯作者: 邱介山
  • 作者简介:王刚(1979—),男,博士,教授,wghy1979@163.com
  • 基金资助:
    国家自然科学基金项目(21878049);东莞市引进创新创业领军人才计划项目

Abstract:

Capacitive deionization (CDI) is a new desalination technology based on the principle of electrosorption, which has the advantages of low cost, no secondary pollution, and low energy consumption. The hydrophilic binders carboxymethyl cellulose sodium (CMC), polyvinyl alcohol (PVA) and sulfonated carboxymethyl cellulose sodium (SCMC), quaternized polyvinyl alcohol (QPVA) were used to prepare the activated carbon electrodes, which further enhanced the hydrophilicity and ion selectivity of activated carbon (AC) electrodes. The hydrophilic charged polymer binder can effectively inhibit the anodic oxidation reaction and enhance the driving force of ion adsorption by virtue of its own charge. In 500 mg/L NaCl salt solution at 1.2/0 V, AC-CMC//AC-PVA and AC-SCMC//AC-QPVA can obtain 14.58 and 17.39 mg/g of desalination, respectively, And after 100 cycles at 0.8/0 V, the retention rates of desalination were 65.48% and 80.53%, respectively.

Key words: capacitive deionization, activated carbon, binder, surface modification

摘要:

电容去离子技术(capacitive deionization,CDI)是一种基于电吸附原理的新型脱盐技术,具有成本低、无污染、能耗小等优点。采用亲水性的羧甲基纤维素钠(CMC)和聚乙烯醇(PVA)黏结剂及其化学修饰得到的具有更多带电基团的磺化羧甲基纤维素(SCMC)和季铵化聚乙烯醇(QPVA)黏结剂制备活性炭电极,能进一步增强活性炭(AC)电极的亲水性和离子选择性。亲水性带电聚合物黏结剂依靠自身的电荷可以有效抑制阳极氧化的副反应,并增强离子吸附驱动力。在500 mg/L NaCl盐溶液,1.2/0 V电压下,AC-CMC//AC-PVA和AC-SCMC//AC-QPVA可分别获得14.58和17.39 mg/g的脱盐量,且在0.8/0 V电压下循环100圈之后,脱盐量的保持率分别为65.48%和80.53%。

关键词: 电容去离子, 活性炭, 黏结剂, 表面改性

CLC Number: