Monovalent anions removal by capacitive deionization integrated with monovalent anion permselective exchange membrane

doi:10.11949/j.issn.0438-1157.20180149

CIESC Journal ›› 2018, Vol. 69 ›› Issue (8): 3502-3508.DOI: 10.11949/j.issn.0438-1157.20180149

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Monovalent anions removal by capacitive deionization integrated with monovalent anion permselective exchange membrane

PAN Jiefeng^1,2, ZHENG Yu¹, DING Jincheng¹, SHI Wenhui^1,2, SHEN Jiangnan^1,2, GAO Congjie^1,2

1 Ocean College, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China;
2 Centre for Membrane Science and Water Technology, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China

Received:2018-02-02 Revised:2018-05-02 Online:2018-08-05 Published:2018-08-05
Supported by:
supported by the National Natural Science Foundation of China (21706232, 21676249) and the National High Technology Research and Development Program of China (2015AA030502).

膜法电容去离子技术用于水溶液中单/多价阴离子的分离

潘杰峰^1,2, 郑瑜¹, 丁金成¹, 施文慧^1,2, 沈江南^1,2, 高从堦^1,2

1 浙江工业大学海洋学院, 浙江杭州 310014;
2 浙江工业大学膜分离与水科学技术中心, 浙江杭州 310014

通讯作者: 沈江南
基金资助:
国家自然科学基金项目（21706232，21676249）；国家高技术研究发展计划项目（2015AA030502）。

Abstract

Abstract:

The objective of this study is to investigate the feasibility of applying capacitive deionization (CDI) integrated with a monovalent anion permselective exchange membrane (PSMCDI) to remove chloride selectivity from a solution of mixed chloride and sulfate ions. Two types of membranes (ASC and ASV) were evaluated for selectivity removal of monovalent and divalent anions. A variety of parameters (anion composition and concentration, pH, operating time, voltage, and flow rate) were investigated to achieve a maximum selectivity. The selectivity for monovalent anions was evaluated by a lab-made MCDI with a model aqueous system (Cl^-/SO₄^2-). The results show that the removal amount of anions increased with increasing anion concentration, but the selectivity for monovalent anions (Cl^-) decreased. The selectivity also decreased with operating time. For the ASV membrane, a monovalent anion selectivity of 1.6 was obtained under the conditions of 1.2 V operating voltage, 10 min adsorption time and 30 ml·min-1 feed flow rate. The corresponding monovalent anion removal selectivity was 1.4 for the ACS membrane. The results in this study can help in developing the PSMCDI technology, and expand its application for removing monovalent anions from a mixed solution.

Key words: membrane capacitive deionization, monovalent anion selective membrane, selective separation, mono-/multivalent anion fractionation

摘要：

将电容去离子技术（CDI）与单价阴离子选择性交换膜结合构建新型膜法电容去离子膜堆（PSMCDI），并探索其在单/多价阴离子分离中的应用。采用自制的测试装置，以Cl^-/SO₄^2-水溶液为模拟体系，并选择现有的两种商业化单价阴离子选择性交换膜（ASV和ACS）作为膜元件，系统地研究了各参数（PSMCDI种类、阴离子组成和浓度、pH、操作时间、电压和流速）对单价离子选择性的影响。结果表明，总阴离子去除量随着阴离子浓度的增加而增加，但是对于单价离子（Cl^-）选择性降低。随着操作时间的增加，单价离子（Cl^-）选择性也降低。对于ASV膜，在1.2 V的直流电压、10 min吸附时间和30 ml·min^-1进料流速的条件下得到1.6的单价阴离子去除选择性。同时，在相同条件下，ACS膜的单价阴离子去除选择性为1.4。

关键词: 膜电容去离子, 单价选择性阴离子交换膜, 选择性分离, 单/多价阴离子分离

CLC Number:

P747⁺.99

PAN Jiefeng, ZHENG Yu, DING Jincheng, SHI Wenhui, SHEN Jiangnan, GAO Congjie. Monovalent anions removal by capacitive deionization integrated with monovalent anion permselective exchange membrane[J]. CIESC Journal, 2018, 69(8): 3502-3508.

潘杰峰, 郑瑜, 丁金成, 施文慧, 沈江南, 高从堦. 膜法电容去离子技术用于水溶液中单/多价阴离子的分离[J]. 化工学报, 2018, 69(8): 3502-3508.

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Monovalent anions removal by capacitive deionization integrated with monovalent anion permselective exchange membrane

膜法电容去离子技术用于水溶液中单/多价阴离子的分离

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