Effect of Anion-exchange Membrane Surface Properties on Mechanisms of Overlimiting Mass Transfer

2006 ◽  
Vol 110 (27) ◽  
pp. 13458-13469 ◽  
Author(s):  
Elena I. Belova ◽  
Galina Yu. Lopatkova ◽  
Natalia D. Pismenskaya ◽  
Victor V. Nikonenko ◽  
Christian Larchet ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Anion Exchange ◽  
Surface Properties ◽  
Membrane Surface ◽  
Anion Exchange Membrane ◽  
Exchange Membrane

scholarly journals Enhancing Ion Transfer in Overlimiting Electrodialysis of Dilute Solutions by Modifying the Surface of Heterogeneous Ion-Exchange Membranes

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Natalia Pismenskaya ◽  
Nadezhda Melnik ◽  
Ekaterina Nevakshenova ◽  
Kseniya Nebavskaya ◽  
Victor Nikonenko
Keyword(s):  
Mass Transfer ◽  
Surface Layer ◽  
Ion Exchange ◽  
Cation Exchange ◽  
Water Splitting ◽  
Anion Exchange ◽  
Membrane Surface ◽  
Anion Exchange Membrane ◽  
Cation Exchange Membrane ◽  
Exchange Membrane

The desalination of dilute NaCl solutions with heterogeneous Russian commercial and modified ion-exchange membranes was studied in a laboratory cell imitating desalination channels of large-scale electrodialysers. The modification was made by casting a thin film of a Nafion-type material on the surface of cation-exchange membrane, and by processing with a strong polyelectrolyte the surface of anion-exchange membrane. It was shown that the modifications resulted in an increase of mass transfer coefficient and in a decrease in water splitting rate, both by up to 2 times. The effect of mass transfer growth is explained by higher surface hydrophobicity of the modified membrane that enhances electroconvection. The decrease in water splitting rate in the case of cation-exchange membrane is due to homogenization of its surface layer. In the case of anion-exchange membrane the effect is due to grafting of quaternary ammonium bases onto the original membrane surface layer. The suppression of water splitting favors development of electroconvection. In turn, intensive electroconvection contributes to deliver salt ions to membrane surface and thus reduces water splitting.

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 La and Al co-doped CaMnO3 perovskite oxides: From interplay of surface properties to anion exchange membrane fuel cell performance

2018 ◽  
Vol 375 ◽  
pp. 265-276 ◽  
Author(s):  
Michael J. Dzara ◽  
Jason M. Christ ◽  
Prabhuram Joghee ◽  
Chilan Ngo ◽  
Christopher A. Cadigan ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Anion Exchange ◽  
Surface Properties ◽  
Perovskite Oxides ◽  
Anion Exchange Membrane ◽  
Cell Performance ◽  
Fuel Cell Performance ◽  
Exchange Membrane ◽  
Co Doped

A chemically assembled anion exchange membrane surface for monovalent anion selectivity and fouling reduction

2019 ◽  
Vol 7 (11) ◽  
pp. 6348-6356 ◽  
Author(s):  
Yan Zhao ◽  
Yi Li ◽  
Shushan Yuan ◽  
Junyong Zhu ◽  
Sofie Houtmeyers ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Condensation Reaction ◽  
Membrane Surface ◽  
Anion Exchange Membrane ◽  
Reaction Process ◽  
Monovalent Anion ◽  
Anion Selectivity ◽  
Organic Fouling ◽  
Fouling Reduction ◽  
Exchange Membrane

A novel anion exchange membrane with simultaneously enhanced monovalent anion selectivity and reduced organic fouling properties was synthesized through oxidative self-polymerization and an amide condensation reaction process.

Mass Transfer in a Co/N/C Catalyst Layer for the Anion Exchange Membrane Fuel Cell

2020 ◽  
Vol 12 (29) ◽  
pp. 32842-32850 ◽  
Author(s):  
Weikang Zhu ◽  
Yabiao Pei ◽  
Yang Liu ◽  
Junfeng Zhang ◽  
Yanzhou Qin ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Fuel Cell ◽  
Anion Exchange ◽  
Catalyst Layer ◽  
Anion Exchange Membrane ◽  
Exchange Membrane
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