Application of UV-synthesized anion exchange membranes to improve nickel removal through galvanic deposition process

Recycling of acid from aqueous waste streams is crucial not only from the environmental point of view but also for maturing the feasible method (diffusion dialysis). Anion exchange membrane (AEM)–based diffusion dialysis process is one of the beneficial ways to recover acid from aqueous waste streams. In this article, the synthesis of a series of brominated poly (2, 6–dimethyl-1, 4–phenylene oxide) (BPPO)-based anion exchange membranes (AEMs) through quaternization with triphenylphosphine (TPP) were reported for acid recovery via diffusion dialysis process. The successful synthesis of the prepared membranes was confirmed by Fourier transform infrared (FTIR) spectroscopy. The as-synthesized anion exchange membranes represented water uptake (WR) of 44 to 66%, ion exchange capacity of (IEC) of 1.22 to 1.86 mmol/g, and linear swelling ratio (LSR) of 8 to 20%. They exhibited excellent thermal, mechanical, and acid stability. They showed homogeneous morphology. The acid recovery performance of the synthesized AEMs was investigated in a two compartment stack using simulated mixture of HCl and FeCl2 as feed solution at room temperature. For the synthesized anion exchange membranes TPP–43 to TPP–100, the diffusion dialysis coefficient of acid (UH+) was in the range of 6.7 to 26.3 (10−3 m/h) whereas separation factor (S) was in the range of 27 to 49 at 25 °C. Obtained results revealed that diffusion dialysis performance of the synthesized AEMs was higher than the commercial membrane DF–120B (UH+ = 0.004 m/h, S = 24.3) at room temperature. It showed that the prepared AEMs here could be excellent candidates for the diffusion dialysis process.

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Polyether Ether Ketone-Based Anion Exchange Membranes with Bis-imidazolium Cations for All-Vanadium Redox Flow Batteries

ACS Applied Energy Materials ◽

10.1021/acsaem.1c00887 ◽

2021 ◽

Author(s):

Song Yang ◽

Xufeng Chu ◽

Bing Xue ◽

Teng Lv ◽

Bencai Lin ◽

...

Keyword(s):

Anion Exchange ◽

Anion Exchange Membranes ◽

Imidazolium Cations ◽

Redox Flow Batteries ◽

Polyether Ether Ketone ◽

Flow Batteries ◽

Ether Ketone ◽

Vanadium Redox

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Transport Characteristics of CJMAED™ Homogeneous Anion Exchange Membranes in Sodium Chloride and Sodium Sulfate Solutions

International Journal of Molecular Sciences ◽

10.3390/ijms22031415 ◽

2021 ◽

Vol 22 (3) ◽

pp. 1415

Author(s):

Veronika Sarapulova ◽

Natalia Pismenskaya ◽

Valentina Titorova ◽

Mikhail Sharafan ◽

Yaoming Wang ◽

...

Keyword(s):

Ion Exchange ◽

Anion Exchange ◽

Volume Fraction ◽

Exchange Capacity ◽

Polymer Materials ◽

Transport Numbers ◽

Anion Exchange Membranes ◽

Microheterogeneous Model ◽

Pass Through ◽

Pes Membrane

The interplay between the ion exchange capacity, water content and concentration dependences of conductivity, diffusion permeability, and counterion transport numbers (counterion permselectivity) of CJMA-3, CJMA-6 and CJMA-7 (Hefei Chemjoy Polymer Materials Co. Ltd., China) anion-exchange membranes (AEMs) is analyzed using the application of the microheterogeneous model to experimental data. The structure–properties relationship for these membranes is examined when they are bathed by NaCl and Na2SO4 solutions. These results are compared with the characteristics of the well-studied homogenous Neosepta AMX (ASTOM Corporation, Japan) and heterogeneous AMH-PES (Mega a.s., Czech Republic) anion-exchange membranes. It is found that the CJMA-6 membrane has the highest counterion permselectivity (chlorides, sulfates) among the CJMAED series membranes, very close to that of the AMX membrane. The CJMA-3 membrane has the transport characteristics close to the AMH-PES membrane. The CJMA-7 membrane has the lowest exchange capacity and the highest volume fraction of the intergel spaces filled with an equilibrium electroneutral solution. These properties predetermine the lowest counterion transport number in CJMA-7 among other investigated AEMs, which nevertheless does not fall below 0.87 even in 1.0 eq L−1 solutions of NaCl or Na2SO4. One of the reasons for the decrease in the permselectivity of CJMAED membranes is the extended macropores, which are localized at the ion-exchange material/reinforcing cloth boundaries. In relatively concentrated solutions, the electric current prefers to pass through these well-conductive but nonselective macropores rather than the highly selective but low-conductive elements of the gel phase. It is shown that the counterion permselectivity of the CJMA-7 membrane can be significantly improved by coating its surface with a dense homogeneous ion-exchange film.

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Electrospun Modified Polyketone-Based Anion Exchange Membranes with High Ionic Conductivity and Robust Mechanical Properties

ACS Applied Energy Materials ◽

10.1021/acsaem.1c00727 ◽

2021 ◽

Author(s):

Yi-cun Zhou ◽

Rui-Ying Bao ◽

Zhengying Liu ◽

Ming-Bo Yang ◽

Wei Yang

Keyword(s):

Mechanical Properties ◽

Ionic Conductivity ◽

Anion Exchange ◽

High Ionic Conductivity ◽

Anion Exchange Membranes

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Effect of current density, concentration of ternary electrolyte and type of cations on the monovalent ion selectivity of surface-sulfonated anion-exchange membranes: Modelling and experiment

Journal of Membrane Science ◽

10.1016/j.memsci.2021.119466 ◽

2021 ◽

pp. 119466

Author(s):

D.V. Golubenko ◽

A.B. Yaroslavtsev

Keyword(s):

Anion Exchange ◽

Current Density ◽

Ion Selectivity ◽

Anion Exchange Membranes ◽

Density Concentration ◽

Monovalent Ion

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Phenolphthalein Anilide Based Poly(Ether Sulfone) Block Copolymers Containing Quaternary Ammonium and Imidazolium Cations: Anion Exchange Membrane Materials for Microbial Fuel Cell

Membranes ◽

10.3390/membranes11060454 ◽

2021 ◽

Vol 11 (6) ◽

pp. 454

Author(s):

Aruna Kumar Mohanty ◽

Young-eun Song ◽

Jung-rae Kim ◽

Nowon Kim ◽

Hyun-jong Paik

Keyword(s):

Fuel Cell ◽

Microbial Fuel Cell ◽

Anion Exchange ◽

Quaternary Ammonium ◽

Anion Exchange Membrane ◽

Anion Exchange Membranes ◽

Good Thermal Stability ◽

Imidazolium Cations ◽

Membrane Morphology ◽

Exchange Membrane

A class of phenolphthalein anilide (PA)-based poly(ether sulfone) multiblock copolymers containing pendant quaternary ammonium (QA) and imidazolium (IM) groups were synthesized and evaluated as anion exchange membrane (AEM) materials. The AEMs were flexible and mechanically strong with good thermal stability. The ionomeric multiblock copolymer AEMs exhibited well-defined hydrophobic/hydrophilic phase-separated morphology in small-angle X-ray scattering and atomic force microscopy. The distinct nanophase separated membrane morphology in the AEMs resulted in higher conductivity (IECw = 1.3–1.5 mequiv./g, σ(OH−) = 30–38 mS/cm at 20 °C), lower water uptake and swelling. Finally, the membranes were compared in terms of microbial fuel cell performances with the commercial cation and anion exchange membranes. The membranes showed a maximum power density of ~310 mW/m2 (at 0.82 A/m2); 1.7 and 2.8 times higher than the Nafion 117 and FAB-PK-130 membranes, respectively. These results demonstrated that the synthesized AEMs were superior to Nafion 117 and FAB-PK-130 membranes.

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