Amphoteric ion-exchange membranes with superior mono-/bi-valent anion separation performance for electrodialysis applications

Liao, Junbin; Yu, Xinyan; Pan, Nengxiu; Li, Jun; Shen, Jiangnan; Gao, Congjie

doi:10.1016/j.memsci.2019.01.052

Cited by 61 publications

(27 citation statements)

References 55 publications

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“…As shown in Figure , in terms of running time, it was clearly observed that perm selectivity peaked within 20–30 min, then dropped rapidly, and leveled off after 90 min. Similar trends have been observed in the ED process involving ion exchange membranes. , The high current density increased the ion flux, which accelerated the emergence of the perm-selective peak. However, ion exchange membranes are usually dense polymers, while MOF membranes are porous materials.…”

Section: Results and Discussionsupporting

confidence: 77%

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Functional UiO-66 Series Membranes with High Perm Selectivity of Monovalent and Bivalent Anions for Electrodialysis Applications

Ruan

Pan

Wang

et al. 2021

Ind. Eng. Chem. Res.

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Metal−organic frameworks (MOFs) have a good separation potential due to their uniform pore size, easy functionalization, and adjustable structure. Therefore, we make use of this feature of MOFs for the separation of Cl − /SO 4 2− systems with different charges and sizes. In this work, two kinds of UiO-66 membranes with different functional groups were synthesized and applied to the monovalent perm-selective separation of the Cl − /SO 4 2− system in electrodialysis (ED). UiO-66-NH 2 membranes were used to investigate the influence of current density and initial solution concentration on perm selectivity. A layer of UiO-66-NH 2 was first grown on the anodic alumina oxide (AAO) disks. After that, short chains containing sulfonic acid groups were grafted onto the amino groups by the ring-opening reaction of 1,3propanesulfonate. The structural stability of the MOF layer was confirmed by XRD analysis of the membrane surface after the ED test. Ion exchange capacity (IEC) and elemental mapping were used to confirm the comparison changes in the degree of sulfonation. It was found that UiO-66-NH 2 membranes exhibited a higher monovalent anion perm selectivity with a peak value of 36.23 (initial mixture solution of 0.05 M NaCl and 0.05 M Na 2 SO 4 ) at lower current density (2.5 mA•cm −2 ). The perm selectivity of UiO-66-SO 3 H membranes increased with running time under 24 h of sulfonation time. In particular, with low IEC value of 0.10−0.16, it still showed a good performance on perm selectivity. Compared with published polymer ion exchange membranes (perm selectivity < 5) for ED, it has higher perm selectivity, more convenient functionalization, and resistance to organic solvents.

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Section: Results and Discussionsupporting

confidence: 77%

“…Similar trends have been observed in the ED process involving ion exchange membranes. 53,54 The high current density increased the ion flux, which accelerated the emergence of the perm-selective peak. However, ion exchange membranes are usually dense polymers, while MOF membranes are porous materials.…”

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confidence: 99%

Functional UiO-66 Series Membranes with High Perm Selectivity of Monovalent and Bivalent Anions for Electrodialysis Applications

Ruan

Pan

Wang

et al. 2021

Ind. Eng. Chem. Res.

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“…Similarly, Cl – and SO 4 2– can be separated by a G5-PS/PIP membrane efficiently. In view of both improved treatment efficiency and selectivity to low/high-valent co-ions, the PA membrane based pressure-driven membrane separation technology shows a great possibility to replace the traditional separation technologies such as ion exchange membrane based electrodialysis technology, as selectivity of the state-of-the-art ion exchange membranes to Na + /Mg 2+ and Cl – /SO 4 2– are always below 20. , Considering that the ion separation performance is dependent on the concentration of the feed solution, low/high-valent co-ion selectivity of the ionic PAMAM dendrimer based PA membranes in feed solution with different concentrations was investigated. With increasing feed solution concentration (mass concentration ratios of both NaCl to MgCl 2 and NaCl to Na 2 SO 4 were fixed at 1:1), the enhanced electrostatic screening effect leads to a reduced membrane charge density and thus weaker electrostatic repulsion for ions, resulting in a decrease of low/high-valent co-ion selectivity (Figure S16).…”

Section: Resultsmentioning

confidence: 99%

Ionic Dendrimer Based Polyamide Membranes for Ion Separation

et al. 2021

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Separating low/high-valent ions with sub-nanometer sizes is a crucial yet challenging task in various areas (e.g., within environmental, healthcare, chemical, and energy engineering). Satisfying high separation precision requires membranes with exceptionally high selectivity. One way to realize this is constructing well-designed ion-selective nanochannels in pressure-driven membranes where the separation mechanism relies on combined steric, dielectric exclusion, and Donnan effects. To this aim, charged nanochannels in polyamide (PA) membranes are created by incorporating ionic polyamidoamine (PAMAM) dendrimers via interfacial polymerization. Both sub-10 nm sizes of the ionic PAMAM dendrimer molecules and their gradient distributions in the PA nanofilms contribute to the successful formation of defect-free PA nanofilms, containing both internal (intramolecular voids) and external (interfacial voids between the ionic PAMAM dendrimers and the PA matrix) nanochannels for fast transport of water molecules. The external nanochannels with tunable ionizable groups endow the PA membranes with both high low/high-valent co-ion selectivity and chemical cleaning tolerance, while the ion sieving/transport mechanism was analyzed by employing the Donnan steric pore model with dielectric exclusion.

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“…Some undesirable side effects like water splitting or electrical convection will cause significant degradation of the membrane performance when the current density reaches the over‐limited stage. [ 49 ] When applied current is above the I lim, ion concentration near the boundary layers tend to increase sharply, which result in a severe concentration polarization. Figure 6b and Table 3 show the current–voltage curves of the prepared AEMs, the limiting current density of G‐PEDG‐PDA membrane was 12.33 mA cm −2 in 0.05 m NaCl solution, which was the lowest among the tested membranes.…”

Section: Results and Analysismentioning

confidence: 99%

Imparting Antimicrobial and Antifouling Properties to Anion Exchange Membrane through the Modification with Gentamicin‐Based Polymer

Luo

Yao

Liao

et al. 2021

Adv Materials Inter

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A series of gentamicin‐modified anion exchange membranes (AEMs) immobilized by mussel‐inspired dopamine coating is prepared in this work. The purpose is to improve antibacterial activity and fouling resistance of the commercial AEMs (AEM Type I, Fujifilm Co.). As a result of the applied modification, the hydrophilicity of membrane surface improved significantly. Thus, the as‐prepared modified AEMs exhibit the good antifouling property, in electrodialysis (ED) experiments by using the sodium dodecylbenzenesulfonate and albumin from bovine serum as model foulants. Furthermore, taking into account the results of the antibacterial test, the resulting modified AEMs exhibit improved antibacterial property for Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). After a brief contact with bacteria, the antibacterial rates of modified AEMs coating with gentamicin‐based polymer are 80.11% for E. coli and 90.66% for S. aureus, which are much higher than pristine AEM (6.28% and 9.07%), respectively. In addition, the modified membrane has good operational stability during ED process and recovery ability after contamination, and also maintains satisfactory electrochemical properties. This investigation highlights a design of simple strategy for the preparation of antimicrobial and antifouling AEM, which can be used for ED.

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Amphoteric ion-exchange membranes with superior mono-/bi-valent anion separation performance for electrodialysis applications

Cited by 61 publications

References 55 publications

Functional UiO-66 Series Membranes with High Perm Selectivity of Monovalent and Bivalent Anions for Electrodialysis Applications

Functional UiO-66 Series Membranes with High Perm Selectivity of Monovalent and Bivalent Anions for Electrodialysis Applications

Ionic Dendrimer Based Polyamide Membranes for Ion Separation

Imparting Antimicrobial and Antifouling Properties to Anion Exchange Membrane through the Modification with Gentamicin‐Based Polymer

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