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

doi:10.11949/0438-1157.20211793

Abstract

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:

TQ 028.8

Gang WANG, Xiaoping CHE, Shiyong WANG, Jieshan QIU. Carbon electrodes modified with water-soluble charged polymer binder for enhanced capacitive deionization performance[J]. CIESC Journal, 2022, 73(4): 1763-1771.

王刚, 车小平, 汪仕勇, 邱介山. 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[J]. 化工学报, 2022, 73(4): 1763-1771.

Figures/Tables 8

Fig.1 Schematic diagram of modifying PVA with GTMAC

Fig.2 Schematic diagram of modifying CMC with SSA

Fig.3 Schematic diagram of SCMC and QPVA binder modified CDI electrodes

Fig.4 FTIR spectra of PVA and QPVA (a); FTIR spectra of CMC and SCMC (b); Zeta potential of PVA, QPVA, CMC, and SCMC (c)

Fig.5 The conductivity changes (a) and current density changes (b) of AC-P//AC-P, AC-P//AC-C, AC-QP//AC-SC and AC-P//AC-P-M at different cell voltages; The conductivity changes (c) and current density changes (d) of AC-P//AC-P, AC-P//AC-C, AC-QP//AC-SC and AC-P//AC-P-M under 1.2 V

Fig.6 SAC (a), charge passed (b), adsorption rate curves (c) and Ragone curves (d) of AC-P//AC-P, AC-P//AC-C, AC-QP//AC-SC, and AC-P//AC-P-M in NaCl solution with an initial concentration of 500 mg/L at different cell voltages

Fig.7 Adsorption curves at the 1st and 100 th cycles of AC-P//AC-P (a), AC-P//AC-C (b), AC-QP//AC-SC (c)， and AC-P//AC-P-M (d) under 0.8/0 V

Fig.8 The SAC (a), charge efficiency (b) and energy consumption (c) of AC-P//AC-P, AC-P//AC-C, AC-QP//AC-SC and AC-P//AC-P-M at 0.8/0 V

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