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Codeposition Modification of Cation Exchange Membranes with Dopamine and Crown Ether To Achieve High K+ Electrodialysis Selectivity
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-04-23 00:00:00 , DOI: 10.1021/acsami.8b21031 Shanshan Yang 1 , Yuanwei Liu 1, 2 , Junbin Liao 1 , Huawen Liu 1 , Yuliang Jiang 1 , Bart Van der Bruggen 3 , Jiangnan Shen 1 , Congjie Gao 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-04-23 00:00:00 , DOI: 10.1021/acsami.8b21031 Shanshan Yang 1 , Yuanwei Liu 1, 2 , Junbin Liao 1 , Huawen Liu 1 , Yuliang Jiang 1 , Bart Van der Bruggen 3 , Jiangnan Shen 1 , Congjie Gao 1
Affiliation
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Surface modification has been proven to be an effective approach for ion exchange membranes to achieve separation of counterions with different valences by altering interfacial construction of membranes to improve ion transfer performance. In this work, we have fabricated a series of novel cation exchange membranes (CEMs) by modifying sulfonated polysulfone (SPSF) membranes via codeposition of mussel-inspired dopamine (DA) and 4′-aminobenzo-15-crown-5 (ACE), followed by glutaraldehyde cross-linking, aiming at achieving selective separation of specific cations. The as-prepared membranes before and after modification were systematically characterized in terms of their structural, physicochemical, electrochemical, and electrodialytic properties. In the electrodialysis process, the modified membranes exhibit distinct perm selectivity to K+ ions in binary (K+/Li+, K+/Na+, K+/Mg2+) and ternary (K+/Li+/Mg2+) systems. In particular, at a constant current density of 5.0 mA·cm–2, modified membrane M-co-0.50 shows significantly prominent perm selectivity 
in the K+/Mg2+ system and M-co-0.75 exhibits remarkable performance in the K+/Li+ system 
, superior to commercial monovalent-selective CEM (CIMS, 
, 
). Besides, in the K+/Li+/Mg2+ ternary system, K+ flux reaches 30.8 nmol·cm–2·s–1 for M-co-0.50, while it reaches 25.8 nmol·cm–2·s–1 for CIMS. It possibly arises from the effects of pore-size sieving and the synergistic action of electric field driving and host–guest molecular recognition of ACE and K+ ions. This study can provide new insights into the separation of specific alkali metal ions, especially on reducing influence of coexisting cations K+ and Na+ on Li+ ion recovery from salt lake and seawater.
中文翻译：
多巴胺和冠醚对阳离子交换膜的共沉积修饰以实现高K +电渗析选择性
已经证明，通过改变膜的界面结构来改善离子转移性能，表面改性是离子交换膜实现具有不同化合价抗衡离子分离的有效方法。在这项工作中，我们通过贻贝启发的多巴胺（DA）和4'-氨基苯并15-冠-5（ACE）的共沉积修饰磺化聚砜（SPSF）膜，从而制造了一系列新型阳离子交换膜（CEM），然后进行戊二醛交联，旨在实现特定阳离子的选择性分离。修饰前后制备的膜根据其结构，物理化学，电化学和电渗析特性进行了系统表征。在电渗析过程中，改性膜对钾的渗透选择性不同+离子以二进制（K + /锂+，K + /钠+，K + /镁2+）和三元（K + /锂+ /镁2+）系统。特别是，在5.0毫安·厘米的恒定电流密度-2，改性膜M -共- 0.50节目显著突出烫发选择性在K + /镁2+系统和M-CO-0.75展品在K显着的性能+ / Li +系统，优于商业单价选择性CEM（CIMS ，，）。此外，在K + / Li+ / Mg 2+三元体系，对于M-co-0.50 ，K +通量达到30.8 nmol·cm –2 ·s –1，而对于CIMS ，它的通量达到25.8 nmol·cm –2 ·s –1。这可能是由于孔径筛分的影响以及电场驱动和ACE和K +离子的主客体分子识别的协同作用所致。这项研究可以为特定碱金属离子的分离提供新的见解，尤其是在减少共存阳离子K +和Na +对从盐湖和海水中回收Li +的影响方面。
更新日期：2019-04-23
in the K+/Mg2+ system and M-co-0.75 exhibits remarkable performance in the K+/Li+ system , superior to commercial monovalent-selective CEM (CIMS, , ). Besides, in the K+/Li+/Mg2+ ternary system, K+ flux reaches 30.8 nmol·cm–2·s–1 for M-co-0.50, while it reaches 25.8 nmol·cm–2·s–1 for CIMS. It possibly arises from the effects of pore-size sieving and the synergistic action of electric field driving and host–guest molecular recognition of ACE and K+ ions. This study can provide new insights into the separation of specific alkali metal ions, especially on reducing influence of coexisting cations K+ and Na+ on Li+ ion recovery from salt lake and seawater.
中文翻译：
多巴胺和冠醚对阳离子交换膜的共沉积修饰以实现高K +电渗析选择性
已经证明，通过改变膜的界面结构来改善离子转移性能，表面改性是离子交换膜实现具有不同化合价抗衡离子分离的有效方法。在这项工作中，我们通过贻贝启发的多巴胺（DA）和4'-氨基苯并15-冠-5（ACE）的共沉积修饰磺化聚砜（SPSF）膜，从而制造了一系列新型阳离子交换膜（CEM），然后进行戊二醛交联，旨在实现特定阳离子的选择性分离。修饰前后制备的膜根据其结构，物理化学，电化学和电渗析特性进行了系统表征。在电渗析过程中，改性膜对钾的渗透选择性不同+离子以二进制（K + /锂+，K + /钠+，K + /镁2+）和三元（K + /锂+ /镁2+）系统。特别是，在5.0毫安·厘米的恒定电流密度-2，改性膜M -共- 0.50节目显著突出烫发选择性
在K + /镁2+系统和M-CO-0.75展品在K显着的性能+ / Li +系统，优于商业单价选择性CEM（CIMS ，，）。此外，在K + / Li+ / Mg 2+三元体系，对于M-co-0.50 ，K +通量达到30.8 nmol·cm –2 ·s –1，而对于CIMS ，它的通量达到25.8 nmol·cm –2 ·s –1。这可能是由于孔径筛分的影响以及电场驱动和ACE和K +离子的主客体分子识别的协同作用所致。这项研究可以为特定碱金属离子的分离提供新的见解，尤其是在减少共存阳离子K +和Na +对从盐湖和海水中回收Li +的影响方面。
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