Fundamental characteristics study of anion-exchange PVDF–SiO2 membranes

2012 ◽  
Vol 66 (11) ◽  
pp. 2343-2348 ◽  
Author(s):  
Xingtao Zuo ◽  
Wenxin Shi ◽  
Shuili Yu ◽  
Jiajie He
Keyword(s):  
Anion Exchange ◽  
Vinylidene Fluoride ◽  
Membrane Surface ◽  
Exchange Capacity ◽  
Anion Exchange Membranes ◽  
Blending Method ◽  
Poly Vinylidene Fluoride ◽  
Potential Applications ◽  
Alkaline Membrane ◽  
Exchange Membrane

A new type of poly(vinylidene fluoride)(PVDF)–SiO2 hybrid anion-exchange membrane was prepared by blending method. The anion-exchange groups were introduced by the reaction of epoxy groups with trimethylamine (TMA). Contact angle between water and the membrane surface was measured to characterize the hydrophilicity change of the membrane surface. The effects of nano-sized SiO2 particles in the membrane-forming materials on the membrane mechanical properties and conductivity were also investigated. The experimental results indicated that PVDF–SiO2 anion-exchange membranes exhibited better water content, ion-exchange capacity, conductivity and mechanic properties, and so may find potential applications in alkaline membrane fuel cells and water treatment processes.

Physicochemical Properties of SiO2/PVDF Ion-Exchange Membranes

2012 ◽  
Vol 531 ◽  
pp. 320-323
Author(s):  
Xing Tao Zuo ◽  
Zhao Dong Tian ◽  
Shui Li Yu
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Physicochemical Properties ◽  
Vinylidene Fluoride ◽  
Exchange Capacity ◽  
Anion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Blending Method ◽  
Poly Vinylidene Fluoride ◽  
Different Content

Poly(vinylidene fluoride)(PVDF)-SiO2anion-exchange membranes was prepared by blending method with the avoidance of chloromethylation. Various membranes were prepared with different content of SiO2nanoparticles. These membranes were extensively characterized for their surface morphology, thermal stability, tensile properties, water content and permselectivity property using SEM, TGA, water uptake and ion exchange capacity measurements. It was found that physicochemical properties of the PVDF/SiO2membranes were found to be highly dependent on the SiO2nanoparticles content in the membrane matrix.

scholarly journals Influential Mechanism of Natural Organic Matters with Calcium Ion on the Anion Exchange Membrane Fouling Behavior via xDLVO Theory

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 968
Author(s):  
Zhun Ma ◽  
Lu Zhang ◽  
Ying Liu ◽  
Xiaosheng Ji ◽  
Yuting Xu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Interaction Energy ◽  
Anion Exchange ◽  
Natural Organic Matter ◽  
Calcium Ions ◽  
Membrane Fouling ◽  
Membrane Surface ◽  
Anion Exchange Membrane ◽  
Anion Exchange Membranes ◽  
Exchange Membrane

The fouling mechanism of the anion exchange membrane (AEM) induced by natural organic matter (NOM) in the absence and presence of calcium ions was systematically investigated via the extended Derjaguin–Landau–Verwey–Overbeek (xDLVO) approach. Sodium alginate (SA), humic acid (HA), and bovine serum albumin (BSA) were utilized as model NOM fractions. The results indicated that the presence of calcium ions tremendously aggravated the NOM fouling on the anion exchange membrane because of Ca-NOM complex formation. Furthermore, analysis of the interaction energy between the membrane surface and foulants via xDLVO revealed that short-range acid–base (AB) interaction energy played a significant role in the compositions of interaction energy during the electrodialysis (ED) process. The influence of NOM fractions in the presence of calcium ions on membrane fouling followed the order: SA > BSA > HA. This study demonstrated that the interaction energy was a dominating indicator for evaluating the tendency of anion exchange membranes fouling by natural organic matter.

scholarly journals A Novel Anion Exchange Membrane for Bisulfite Anion Separation by Grafting a Quaternized Moiety through BPPO via Thermal-Induced Phase Separation

2020 ◽  
Vol 21 (16) ◽  
pp. 5782
Author(s):  
Md Mofasserul Alam ◽  
Yaoming Wang ◽  
Chenxiao Jiang ◽  
Tingting Xu ◽  
Yahua Liu ◽  
...  
Keyword(s):  
Phase Separation ◽  
Anion Exchange ◽  
Membrane Surface ◽  
Separation Performance ◽  
Anion Exchange Membranes ◽  
Transmission Electron ◽  
Alkali Medium ◽  
Core Elements ◽  
Anion Separation ◽  
Exchange Membrane

Ion-exchange membranes are the core elements for an electrodialysis (ED) separation process. Phase inversion is an effective method, particularly for commercial membrane production. It introduces two different mechanisms, i.e., thermal induced phase separation (TIPS) and diffusion induced phase separation (DIPS). In this study, anion exchange membranes (AEMs) were prepared by grafting a quaternized moiety (QM,2-[dimethylaminomethyl]naphthalen-1-ol) through brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) via the TIPS method. Those membranes were applied for selective bisulfite (HSO3−) anion separation using ED. The membrane surface morphology was characterized by SEM, and the compositions were magnified using a high-resolution transmission electron microscope (HRTEM). Notably, the membranes showed excellent substance stability in an alkali medium and in grafting tests performed in a QM-soluble solvent. The ED experiment indicated that the as-prepared membrane exhibited better HSO3− separation performance than the state-of-the-art commercial Neosepta AMX (ASTOM, Japan) membrane.

Dehydrohalogenated poly(vinylidene fluoride)-based anion exchange membranes for fuel cell applications

2022 ◽  
Vol 23 ◽  
pp. 100640
Author(s):  
O. Prakash ◽  
S. Bihari ◽  
Keshav ◽  
S. Tiwari ◽  
R. Prakash ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Anion Exchange ◽  
Vinylidene Fluoride ◽  
Anion Exchange Membranes ◽  
Poly Vinylidene Fluoride

scholarly journals Anion Exchange Membranes Based on Imidazoline Quaternized Polystyrene Copolymers for Fuel Cell Applications

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 901
Author(s):  
Li-Cheng Jheng ◽  
Chung-Yen Hsu ◽  
Hong-Yi Yeh
Keyword(s):  
Fuel Cell ◽  
Anion Exchange ◽  
Imidazole Ring ◽  
Alkaline Treatment ◽  
Exchange Capacity ◽  
Anion Exchange Membranes ◽  
Fuel Cell Performance ◽  
Pendent Groups ◽  
Application Potential ◽  
Exchange Membrane

Imidazoline is a five-membered heterocycle derived by the partial reduction of one double bond of the imidazole ring. This work prepared new anion exchange membranes (AEMs) based on imidazoline quaternized polystyrene copolymers bearing N-b-hydroxyethyl oleyl imidazolinium pendent groups to evaluate the application potential for anion exchange membrane fuel cells (AEMFCs). For comparison, an imidazole quaternized polystyrene copolymer was also synthesized. The polymer chemical structure was confirmed by FTIR, NMR, and TGA. In addition, the essential properties of membranes, including ion exchange capacity (IEC), water uptake, and hydroxide conductivity, were measured. The alkaline stabilities of imidazolium-based and imidazolinium-based AEMs were compared by means of the changes in the TGA thermograms, FTIR spectra, and hydroxide conductivity during the alkaline treatment in 1 M KOH at 60 °C for 144 h. The results showed that the imidazolinium-based AEMs exhibited relatively lower hydroxide conductivity (5.77 mS/cm at 70 °C) but much better alkaline stability compared with the imidazolium-based AEM. The imidazolinium-based AEM (PSVBImn-50) retained 92% of its hydroxide conductivity after the alkaline treatment. Besides, the fuel cell performance of the imidazolium-based and imidazolinium-based AEMs was examined by single-cell tests.

scholarly journals Alkaline membrane fuel cells: anion exchange membranes and fuels

2021 ◽  
Author(s):  
Maša Hren ◽  
Mojca Božič ◽  
Darinka Fakin ◽  
Karin Stana Kleinschek ◽  
Selestina Gorgieva
Keyword(s):  
Fuel Cells ◽  
Anion Exchange ◽  
Energy Production ◽  
Proton Exchange Membrane ◽  
Anion Exchange Membrane ◽  
Proton Exchange ◽  
Anion Exchange Membranes ◽  
Electrochemical Devices ◽  
Alkaline Membrane ◽  
Exchange Membrane

Alkaline anion exchange membrane fuel cells (AAEMFC) are attracting ever-increasing attention, as they are promising electrochemical devices for energy production, presenting a viable opponent to proton exchange membrane fuel cells (PEMFCs).

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