scholarly journals Electrodialysis of a sodium sulphate solution with experimental bentonite-modified bipolar membranes

2021 ◽  
Vol 23 (4) ◽  
pp. 518-528
Author(s):  
Olga A. Kozaderova ◽  
Ksenia B. Kim ◽  
Petr E. Belousov ◽  
Anna V. Timkova ◽  
Sabukhi I. Niftaliev
Keyword(s):  
Stearic Acid ◽  
Anion Exchange ◽  
Cation Exchanger ◽  
Bentonite Clay ◽  
Sodium Sulphate ◽  
Sulphate Solution ◽  
Bipolar Membrane ◽  
Bipolar Membranes ◽  
Bentonite Clays ◽  
Exchange Membrane

The aim of this work is to study the characteristics of the electrodialysis of a sodium sulphate solution with experimental bipolar membranes based on the MA-41 anion exchange membrane and a liquid sulphonated cation-exchanger modified with bentonite clays. The conversion of sodium sulphate was conducted by electrodialysis with bipolar membranes obtained by applying a liquid sulphonated cation-exchanger containing particles of bentonite clay to the MA-41 anion-exchange membrane.To increase the performance of membranes in terms of hydrogen and hydroxyl ions, we carried out organomodifications of bentonite with alkyldimethylbenzylammonium chloride and stearic acid at various concentrations. The bipolar membrane with the addition of bentonite modified with alkyldimethylbenzylammonium chloride (2 wt%) showed a higher performance in terms of H+-ions. The bipolar membrane with bentonite modified with stearic acid (3 wt%) added to its cation-exchangelayer is the most effective in terms of obtaining a flux of OH--ions. It was shown that a combination ofalkyldimethylbenzylammonium chloride (2 wt%) and stearic acid (3 wt%) used to modify bentonite can increase the performance of the bipolar membrane during the conversion of sodium sulphate, both in terms of the acid and alkali.

scholarly journals In-Situ Combination of Bipolar Membrane Electrodialysis with Monovalent Selective Anion-Exchange Membrane for the Valorization of Mixed Salts into Relatively High-Purity Monoprotic and Diprotic Acids

Membranes ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 135 ◽  
Author(s):  
Haiyang Yan ◽  
Wei Li ◽  
Yongming Zhou ◽  
Muhammad Irfan ◽  
Yaoming Wang ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Current Density ◽  
High Purity ◽  
Anion Exchange Membrane ◽  
Discharge Process ◽  
Bipolar Membrane ◽  
Liquid Discharge ◽  
Bipolar Membrane Electrodialysis ◽  
Mixed Salts ◽  
Exchange Membrane

The crystalized mixed salts from the zero liquid discharge process are a hazardous threat to the environment. In this study, we developed a novel electrodialysis (SBMED) method by assembling the monovalent selective anion-exchange membrane (MSAEM) into the bipolar membrane electrodialysis (BMED) stack. By taking the advantages of water splitting in the bipolar membrane and high perm-selectivity of MSAEM for the Cl− ions against the SO42− ions, this combination allows the concurrent separation of Cl−/SO42− and conversion of mixed salts into relatively high-purity monoprotic and diprotic acids. The current density has a significant impact on the acid purity. Both the monoprotic and diprotic acid purities were higher than 80% at a low current density of 10 mA/cm2. The purities of the monoprotic acids decreased with an increase in the current density, indicating that the perm-selectivity of MSAEM decreases with increasing current density. An increase in the ratio of monovalent to divalent anions in the feed was beneficial to increase the purity of monoprotic acids. High-purity monoprotic acids in the range of 93.9–96.1% were obtained using this novel SBMED stack for treating simulated seawater. Therefore, it is feasible for SBMED to valorize the mixed salts into relatively high-purity monoprotic and diprotic acids in one step.

Electrochemical Performance Evaluation of Bipolar Membrane Using Poly(phenylene oxide) for Water Treatment System

2020 ◽  
Vol 20 (11) ◽  
pp. 6797-6801
Author(s):  
Tae Yang Son ◽  
Jun Seong Yun ◽  
Kihyun Kim ◽  
Sang Yong Nam
Keyword(s):  
Tensile Strength ◽  
Ion Exchange ◽  
Water Splitting ◽  
High Efficiency ◽  
Ion Exchange Membranes ◽  
Bipolar Membrane ◽  
Porous Support ◽  
Bipolar Membranes ◽  
Phenylene Oxide ◽  
Exchange Membrane

This study describes the use of poly(phenylene oxide) polymer-based ion-exchange polymers, polystyrene-based ion-exchange particles and a porous support for fabricating bipolar membranes and the results of an assessment of the applicability of these materials to water splitting. In order to achieve good mechanical as well as good ion-exchange properties, bipolar membranes were prepared by laminating poly(phenylene oxide) and polystyrene based ion-exchange membranes with a sulfonated polystyrene-block-(ethylene-ran-butylene)-block-polystyrene) (S-SEBS) modified interface. PE pore-supported ion-exchange membranes were also used as bipolar membranes. The tensile strength was 13.21 MPa for the bipolar membrane which utilized only a cation/anion-exchange membrane. When ion-exchange nanoparticles were introduced for high efficiency, a reduction in the tensile strength to 6.81 MPa was observed. At the same time, bipolar membrane in the form of a composite membrane using PE support exhibited the best tensile strength of 32.41 MPa. To confirm the water-splitting performance, an important factor for a bipolar membrane, pH changes over a period of 20 min were also studied. During water slitting using CA-P-PE-BPM, the pH at the CEM part and the AEM part changed from 5.4 to 4.18 and from 5.4 to 5.63, respectively.

Denitrification of ground water by electrodialysis using a new anion exchange membrane

2000 ◽  
Vol 49 (4) ◽  
pp. 211-218
Author(s):  
F. Elhannouni ◽  
M. Belhadj ◽  
M. Taky ◽  
A. El Midaoui ◽  
L. Echihabi ◽  
...  
Keyword(s):  
Ground Water ◽  
Anion Exchange ◽  
Anion Exchange Membrane ◽  
Exchange Membrane

scholarly journals Durability of Anion Exchange Membrane Water Electolyzers

2021 ◽  
Author(s):  
Dongguo Li ◽  
Andrew R Motz ◽  
Chulsung Bae ◽  
Cy Fujimoto ◽  
Gaoqiang Yang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Anion Exchange ◽  
Low Cost ◽  
Anion Exchange Membrane ◽  
Production Technologies ◽  
Exchange Membrane

Interest in the low-cost production of clean hydrogen is growing. Anion exchange membrane water electrolyzers (AEMWEs) are considered one of the most promising sustainable hydrogen production technologies because of their...

scholarly journals Effect of Gas Diffusion Layer Thickness on the Performance of Anion Exchange Membrane Fuel Cells

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 718
Author(s):  
Van Men Truong ◽  
Ngoc Bich Duong ◽  
Hsiharng Yang
Keyword(s):  
Water Management ◽  
Anion Exchange ◽  
Critical Role ◽  
Gas Diffusion ◽  
Anion Exchange Membrane ◽  
Cell Performance ◽  
Water Flooding ◽  
Diffusion Layer Thickness ◽  
Diffusion Layers ◽  
Exchange Membrane

Gas diffusion layers (GDLs) play a critical role in anion exchange membrane fuel cell (AEMFC) water management. In this work, the effect of GDL thickness on the cell performance of the AEMFC was experimentally investigated. Three GDLs with different thicknesses of 120, 260, and 310 µm (denoted as GDL-120, GDL-260, and GDL-310, respectively) were prepared and tested in a single H2/O2 AEMFC. The experimental results showed that the GDL-260 employed in both anode and cathode electrodes exhibited the best cell performance. There was a small difference in cell performance for GDL-260 and GDL-310, while water flooding was observed in the case of using GDL-120 operated at current densities greater than 1100 mA cm−2. In addition, it was found that the GDL thickness had more sensitivity to the AEMFC performance as used in the anode electrode rather than in the cathode electrode, indicating that water removal at the anode was more challenging than water supply at the cathode. The strategy of water management in the anode should be different from that in the cathode. These findings can provide a further understanding of the role of GDLs in the water management of AEMFCs.

Side-chain manipulation of poly (phenylene oxide) based anion exchange membrane: Alkoxyl extender integrated with flexible spacer

2021 ◽  
Vol 624 ◽  
pp. 119088
Author(s):  
Lv Li ◽  
Jiaao Wang ◽  
Manzoor Hussain ◽  
Lingling Ma ◽  
Naeem Akhtar Qaisrani ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Anion Exchange Membrane ◽  
Side Chain ◽  
Flexible Spacer ◽  
Phenylene Oxide ◽  
Exchange Membrane
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