Development Of Ion-exchange Membranes Research Articles

Anion exchange membranes with orderly channels enabled by charge transfer interactions for fast transportation of Cl−

The formation of an ordered microphase separation structure and the realization of efficient selective ion conduction by precise regulation of the self-assembly process of solid ionic conductive polymers are important in the fields of batteries and electrodialysis. To prepare ion exchange membranes with high conductivity and selectivity, we report a strategy for the design of a selective directional self-assembly backbone by the introduction of charge transfer interactions. Fluorescence spectroscopy (FL) and nano-scale microscopy analysis confirmed the self-assembly of the backbone with charge transfer interactions which resulted in good microphase separation structures for fast transportation of Cl−. The obtained QP(NDIB/PyB)-1 anion exchange membrane (AEM) showed the highest chloride ion conductivity of 83 mS cm−1 (80 °C). In addition, the selectivity of QP(NDIB/PyB)-X was verified by separation experiments of Cl− and SO42‐ (PSO42‐Cl‐ = 21.8). This introduction of electron transfer interactions into polymer structures is expected to contribute to the expansion of ion channel construction strategies and the development of ion-exchange membranes.

A novel porous asymmetric cation exchange membrane with thin selective layer for efficient electrodialysis desalination

Ion exchange membranes (IEMs) are widely used in various electrochemical fields. Generally, identifying a solution for the trade-off between ion conductivity and dimensional stability is crucial for the further development of IEMs in the electrodialysis (ED) process. This study aimed to prepare a novel type of cation exchange membrane for electrodialysis desalination. Different from the previous cation exchange membranes with the thick and dense cross-section structure, the as-prepared asymmetric composite membranes in the present work composed of a thin and dense skin layer and a porous support layer via the pore-filling process of the skin layer of the porous poly (ether sulfone) (PES) membrane. Benefiting from such structural features, effective ion transport and dimensional stability were simultaneously achieved in the case of low ion exchange capacity. Ultimately, the optimal sulfonated poly (ether sulfone)-poly (ether sulfone) (SPES-PES) composite membrane simultaneously achieved ion transport enhancement, low swelling rate at 80 °C, and better mechanical stability compared to pure sulfonated poly (ether sulfone) (SPES) membranes. When applied to ED, the prepared 40 %SPES-PES membrane exhibited more excellent desalination performance (91.9%), higher current efficiency (127.5%), and lower energy loss (5.55 Kw·h·kg−1) compared to commercial membrane.

Ion Exchange Membrane “ABC” – A Key Material for Upgrading Process Industries

AbstractIon exchange membrane plays a crucial role in transforming and upgrading traditional chemical manufacturing procedures and boosting a multitude of new applications. Due to the strict regulations on wastewater discharge and increasing demands of renewable energy, anion exchange membrane (“A” membrane), bipolar membrane (“B” membrane) and cation exchange membrane (“C” membrane) have become a key material for upgrading various process industries. Herein, we summarized several novel synthetic routes for “ABC” membranes fabrication from the viewpoints of designing novel membrane synthetic routes, regulating the ionic transport channels, imparting dynamic transfer regions, introducing intrinsic micro‐porosity into the membrane and among others. The account includes a brief introduction to membrane structure designs and fabrications, emerging and industrial applications, and perspectives on ion exchange membranes. Who is the most influenced person in your academic career?My supervisor academician Binglin He.How do you get into the field of ion exchange membrane?I got in contact with ion exchange membranes during my postdoc research in Nankai University under the guidance of Prof. Binglin He. My supervisor is known as “father of China's ion exchange resin”. But in the synthesis of ion exchange resin, the resin pellets larger than 6 mm or smaller than 4 mm cannot be used and are directly discarded. Therefore, Prof. He asked me to explore how to convert them into membrane shape so as to reuse the wasted resin. Since then I entered the field of ion exchange membrane.In your opinion, what is the most promising ion exchange membrane in the next couple years?Alkaline stable anion‐exchange membranes that can be used for hydrogen production from electrolytic water splitting, fuel cells, and electrochemical ammonia synthesis, etc.Besides the fundamental research, why do you spend a lot time andenergy to industrialize the ion exchange membrane?Ion exchange membrane is relatively a narrow product in the field of separation membrane materials. Nowadays, there are tremendous demands of these kind of membranes due to the stricter regulations on wastewater disposal. However, the development of ion exchange membranes in China lags far behind that in other developed countries. As a scientist in this filed, I believe that I have the responsibility to promote the development and advancement of our domestic ion exchange membrane. For this reason, four licensed patents of us have been transferred for industrialization and more than 400000 m2 of membranes were used per year in various industries.What is the greatest honor for your academic achievement?My students are my greatest honor. I am proud of more and more students being graduated from my lab, who have played/will play important roles in making our country stronger.What's your hobbies?Walking, playing basketball and cards.

Development of Ion-Exchange Membranes for the Membrane Bunsen Reaction in Thermochemical Hydrogen Production by Iodine-Sulfur Process

Development of Ion-Exchange Membranes for the Membrane Bunsen Reaction in Thermochemical Hydrogen Production by Iodine-Sulfur Process

Nanostructured Ion-Exchange Membranes for Fuel Cells: Recent Advances and Perspectives.

Polymer-based materials with tunable nanoscale structures and associated microenvironments hold great promise as next-generation ion-exchange membranes (IEMs) for acid or alkaline fuel cells. Understanding the relationships between nanostructure, physical and chemical microenvironment, and ion-transport properties are critical to the rational design and development of IEMs. These matters are addressed here by discussing representative and important advances since 2011, with particular emphasis on aromatic-polymer-based nanostructured IEMs, which are broadly divided into nanostructured polymer membranes and nanostructured polymer-filler composite membranes. For each category of membrane, the core factors that influence the physical and chemical microenvironments of the ion nanochannels are summarized. In addition, a brief perspective on the possible future directions of nanostructured IEMs is presented.

人工膜と生体膜の接点をさぐる　人工膜と生体膜におけるチャネルとゲート

More than a quater century ago, investigation of an artificial membrane had a significant influence on the research of biological membrane theoretically and biologically. Nernst-Planck equation, Donnan equilibrium, Goldman-Hodgkin-Katz equation, phenomenological equation based on nonequilibrium thermodynamics had played an important role for the explanation of transport phenomena through biological membrane and the development of ion-exchange membranes. Recently, understanding of structure on membrane protein has been more and more facilitated.Therefore it will be possible to investigate the transport phenomena of ions through channel protein in the field of molecular theory and explain the mechanism of gating precisely. In this review the way how to approach the problems in channel protein and gate is discussed from the viewpoint of artificial membrane research.

Ion exchange membranes and separation processes with chemical reactions

Recent research trends in the development of ion exchange membranes and their use in separation processes with chemical reactions are reviewed. Emphasis in research on the ion exchange membrane is trending toward analysis of micro-structure of the membranes and to development of new functionalized ion exchange membranes in response to industrial requirements. Separation processes with chemical reactions are discussed according to the following classifications: (1) double decomposition of electrolytes; (2) production of acid and base by bipolar ion exchange membrane processes; (3) separators for electrolysis; (4) separators for batteries; (5) use as solid polyelectrolytes; (6) active transport through ion exchange membranes; (7) acceleration of chemical reactions by ion exchange membranes; (8) carrier transport in ion exchange membranes; (9) transducers for electrical signals from chemical reactions; and (10) modified electrodes.

Report on Research and Development of Ion Exchange Membranes in China

Report on Research and Development of Ion Exchange Membranes in China