Article
Engineering, Chemical
Luigi Gurreri, Antonia Filingeri, Michele Ciofalo, Andrea Cipollina, Michele Tedesco, Alessandro Tamburini, Giorgio Micale
Summary: Electrodialysis (ED) technology is gaining attention in desalination and water treatment, but energy consumption and costs can be limiting factors. This study demonstrates that using asymmetrically profiled membranes, specifically Overlapped Crossed Filaments profiled membranes, can optimize ED system performance by improving current density and efficiency. The results suggest that well-designed profiled membranes can reduce energy consumption and improve desalination cost-effectiveness.
Article
Chemistry, Physical
Aytekin Celik, Halil Hasar
Summary: The study found that polysulfone-based anion and cation exchange membranes have the lowest resistance, highest ion exchange capacities, and ionic conductivities, while polystyrene-based anion exchange and poly(butadiene-co-styrene)-based cation exchange membranes have higher tensile strengths. The chloromethylation method using a mixture of formaldehyde and HCl improved the resistance, ion exchange capacity, and ionic conductivity properties of AEMs compared to other methods.
Article
Engineering, Chemical
D. Yu Butylskii, V. A. Troitskiy, M. V. Sharafan, N. D. Pismenskaya, V. V. Nikonenko
Summary: Membrane scaling and subsequent cleaning efficiency are major limitations for the commercial applications of electrodialysis. By modifying the commercial anion-exchange membrane and reducing the water splitting rate, its scaling resistance is improved. In situ modified membranes exhibit better properties in decreasing the water splitting rate and reducing scale formation.
Article
Engineering, Chemical
D. Golubenko, A. B. Yaroslavtsev
Summary: This study investigates the monovalent-ion selectivity of surface-sulfonated anion exchange membranes in relation to electrodialysis desalination current density, concentration of equimolar ternary electrolytes, and cation type. Experimental results were interpreted using numerical simulations to predict the behavior of the membranes under changing conditions.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
I Salmeron-Sanchez, J. Asenjo-Pascual, J. R. Aviles-Moreno, J. C. Perez-Flores, P. Mauleon, P. Ocon
Summary: This study modified four commercially available ion exchange membranes to reduce the crossover phenomena of redox active species in AORFB systems. The modified membranes showed optimal properties with minimal impact on ion conductivity, making them appealing for AORFB applications. Additionally, the modified anionic exchange membranes demonstrated increased ion exchange capacity and greater double layer stability compared to cationic exchange membranes.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Ryan Kingsbury, Maruti Hegde, Jingbo Wang, Ahmet Kusoglu, Wei You, Orlando Coronell
Summary: In this study, we successfully synthesized a series of anion exchange membranes containing non-covalent cross-links formed by a hydrogen bond donor and acceptor. These monomers act synergistically to improve both membrane permselectivity and conductivity, and can be used to tune these properties relatively independently of each other, escaping the tradeoff observed in conventional membranes.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Metallurgy & Metallurgical Engineering
Dan-dan Lu, Jing Gao, Han Zhou, Yun-ren Qiu
Summary: In this study, complexation-ultrafiltration and shear induced dissociation coupling with rotating disk membrane and polyacrylate sodium were used to selectively separate La(III) and Ce(III) from aqueous solution. The results showed that the PAA-Ce complex was more stable and could achieve efficient separation under suitable conditions.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Polymer Science
Dafu Cao, Xiaowei Sun, Huan Gao, Li Pan, Nanwen Li, Yuesheng Li
Summary: This study investigated the effect of perfluorinated substituent on the properties of anion exchange membranes (AEMs). Cross-linked polynorbornene-based AEMs with perfluorinated branch chains were prepared and showed low swelling ratio, high toughness, and high water uptake. These AEMs exhibited high hydroxide conductivity at low ion content due to the ion gathering and side chain microphase separation caused by the flexible backbone and perfluorinated branch chain. The introduction of perfluorinated branch chains provides a new approach to improve ion conductivity at low ion content and offers a referable way to prepare high-performance AEMs.
Review
Polymer Science
Sadhasivam Thangarasu, Tae-Hwan Oh
Summary: Cellulose-based membranes have attracted attention as ion exchange membranes in proton exchange membrane fuel cells and alkaline fuel cells. The focus of research is on enhancing their functional properties and reducing production costs.
Article
Nanoscience & Nanotechnology
Junxiang Zhang, Zeyu Cheng, Xinbo Qin, Xi Gao, Rongping Yun, Xu Xiang
Summary: Researchers designed a membrane electrode with conductive and hydrophilic bifunctionality based on H2TiO3 ion sieve (HTO). Reduced graphene oxide (RGO) was combined with the ion sieve to improve electrical conductivity, while tannic acid (TA) was polymerized on the surface to enhance hydrophilicity. These modifications improved the electrochemical performance of the electrode and facilitated ion migration and adsorption. The modified electrode exhibited excellent selectivity for Na+/Li+ and Mg2+/Li+ separation, as well as good cycling stability.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
M. Zafari, T. Kikhavani, S. N. Ashrafizadeh
Summary: In this study, the selectivity of an anion exchange membrane for formate anions was improved in electrodialysis by carrying out a hybrid surface modification. The modified membrane showed a decrease in water content and an increase in selectivity towards formate ions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Sungjun Kim, Chi-Yeong Ahn, Mohanraju Karuppannan, Yung-Eun Sung, Oh Joong Kwon, Yong-Hun Cho
Summary: The design of electrode microstructure is crucial for high-performance anion exchange membrane fuel cells, with different solvents significantly impacting the pore structure of the electrode while the electrochemically active surface area remains relatively constant. Electrodes with large porous structures outperform dense electrodes in AEMFC performance at both the anode and cathode.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Ryoya Itoshiro, Naoko Yoshida, Toshiyuki Yagi, Yuriko Kakihana, Mitsuru Higa
Summary: This study compared the performance of two microbial fuel cells equipped with anion or cation exchange membranes for sewage wastewater treatment. The results showed that the microbial fuel cell with anion exchange membrane generated a higher current than the one with cation exchange membrane. This difference in current was attributed to the difference in pH at the cathode, with the anion exchange membrane having a neutral pH and the cation exchange membrane having a high pH. The membrane resistance increased with operation time and depth, but had minimal contribution to the cathode resistance.
Article
Engineering, Chemical
Yansu Lan, Die Zhou, Longhuan Lai, Huanhuan Qi, Lei Xia, Stef Depuydt, Bart Van der Bruggen, Yan Zhao
Summary: Membrane technology has great potential in bromide recovery, and a class of novel anion exchange membranes (AEMs) fabricated through chemical substitution reaction showed better performance in bromide recovery and higher selectivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Yu Pan, Kang Jiang, Xingrun Sun, Siyu Ma, Yat-Ming So, Hongwei Ma, Xiaoming Yan, Ning Zhang, Gaohong He
Summary: The study developed a novel strategy to fabricate AEMs with a star topological structure and block copolymers, which can effectively improve the ionic conductivity and stability of AEM.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Physical
I. A. Stenina, P. A. Yurova, L. Novak, A. R. Achoh, V. Zabolotsky, A. B. Yaroslavtsev
Summary: The incorporation of sulfated zirconia (S-ZrO2) enhances the conductivity and permselectivity of the composite membranes. Additionally, composite membranes with S-ZrO2 maintain their selectivity during long-term tests.
COLLOID AND POLYMER SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Anton Kozmai, Veronika Sarapulova, Mikhail Sharafan, Karina Melkonian, Tatiana Rusinova, Yana Kozmai, Natalia Pismenskaya, Lasaad Dammak, Victor Nikonenko
Summary: Electrochemical impedance spectroscopy shows potential for assessing capacitance of interphase boundaries and resistance of foulant layers. Different contact conditions lead to variations in water splitting and resistance, with short-term contact affecting water splitting and longer contact causing biofouling to influence electrolysis.
Article
Biochemistry & Molecular Biology
Stanislav Melnikov, Denis Bondarev, Elena Nosova, Ekaterina Melnikova, Victor Zabolotskiy
Article
Biochemistry & Molecular Biology
Veronika Sarapulova, Natalia Pismenskaya, Valentina Titorova, Mikhail Sharafan, Yaoming Wang, Tongwen Xu, Yang Zhang, Victor Nikonenko
Summary: The study examined the interaction between ion exchange capacity, water content, and concentration on the conductivity, diffusion permeability, and counterion transport numbers of CJMA-3, CJMA-6, and CJMA-7 anion-exchange membranes. Results showed that CJMA-6 has the highest counterion permselectivity, CJMA-3 has characteristics similar to AMH-PES, and CJMA-7 has the lowest exchange capacity and counterion transport number among the membranes studied.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Physics, Multidisciplinary
G. F. Kopytov, V. V. Malyshko, A. Goryachko, M. Sharafan, A. Churkina, A. Moiseev, D. Shashkov, O. M. Lyasota
Summary: The sorption activity of silver nanoparticles on biodegradable polymers of natural and artificial origin has been established, with natural fibers showing higher adsorption activity for AgNPs in the size range of 1 to 10 nm. After 24 hours, a significant increase in small AgNPs on collagen fibers was observed.
RUSSIAN PHYSICS JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Denis Davydov, Elena Nosova, Sergey Loza, Aslan Achoh, Alexander Korzhov, Mikhail Sharafan, Stanislav Melnikov
Summary: The study demonstrates the potential of using a microheterogeneous model to estimate the transport numbers of counterions through ion-exchange membranes and calculating the open-circuit potential and power density of a reverse electrodialyzer. Different batches of Ralex membranes exhibit similar characteristics, while significant variations are found in the characteristics of MK-40 and MA-41 membranes in concentrated solutions.
Article
Engineering, Chemical
O. A. Rybalkina, M. V. Sharafan, V. V. Nikonenko, N. D. Pismenskaya
Summary: Electrodialysis is increasingly used for the recovery and separation of weak polybasic acids. The generation of H+ ions can occur through water splitting or acid dissociation mechanisms. Water splitting occurs in all electrolytes, while acid dissociation is characteristic of weak polybasic acids and other ampholytes. Both mechanisms play a role in electrodialysis processes.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
D. Yu Butylskii, V. A. Troitskiy, M. V. Sharafan, N. D. Pismenskaya, V. V. Nikonenko
Summary: Membrane scaling and subsequent cleaning efficiency are major limitations for the commercial applications of electrodialysis. By modifying the commercial anion-exchange membrane and reducing the water splitting rate, its scaling resistance is improved. In situ modified membranes exhibit better properties in decreasing the water splitting rate and reducing scale formation.
Article
Biochemistry & Molecular Biology
Dmitrii Y. Butylskii, Vasiliy A. Troitskiy, Maria A. Ponomar, Ilya A. Moroz, Konstantin G. Sabbatovskiy, Mikhail Sharafan
Summary: In this study, anion-exchange membranes were modified with a polyquaternium-22 (PQ-22) polymer, which successfully replaced weakly basic amino groups with quaternary amino groups on the membrane surface. The modified membranes exhibited increased surface charge, higher current density, and reduced plateau length. The results showed that the modified membranes had improved resistance to scaling during electrodialysis.
Article
Chemistry, Physical
D. Yu Butylskii, V. A. Troitskiy, A. S. Skudarnova, M. Sharafan
Summary: The study results show that the oscillations in the chronopotentiograms of the MA-41P anion-exchange membrane during scaling can serve as a signal for flushing and regenerating ion-exchange membranes when processing dilute stratal water.
MEMBRANES AND MEMBRANE TECHNOLOGIES
(2022)
Article
Chemistry, Physical
A. D. Gorobchenko, V. V. Gil, V. V. Nikonenko, M. V. Sharafan
Summary: This paper presents a one-dimensional model for studying the competitive transfer of singly and doubly charged ions through a multilayer composite ion-exchange membrane. The specific permselectivity coefficient of the membrane is found to reach a maximum value, which increases with the number of nanosized modification bilayers but decreases the flux of the preferentially transferred ion. This maximum value is achieved at underlimiting current densities and relatively low potential drop.
MEMBRANES AND MEMBRANE TECHNOLOGIES
(2022)
Article
Chemistry, Physical
V. V. Gil, V. D. Ruleva, M. V. Porozhnyy, M. V. Sharafan
Summary: Ion-exchange membranes with high specific selectivity to singly charged ions are needed in various industries. The formation of a thin layer with opposite charge on the membrane surface can increase the specific selectivity. The interaction between calcium ions and sulfonate groups on the membrane surface was studied to form such a layer. The CMX membrane showed the highest ability to adsorb calcium ions due to its higher group density on the -SO3- surface compared to other membranes. The formation of a thin positively charged layer on the CMX membrane surface increased the membrane permselectivity coefficient PNa+/Ca2+ by 69%, without causing unwanted water splitting as seen with commonly used polyelectrolytes with amino groups as modifiers.
MEMBRANES AND MEMBRANE TECHNOLOGIES
(2023)
Article
Chemistry, Physical
D. Yu Butylskii, V. A. Troitskiy, A. S. Skudarnova, M. Sharafan, N. D. Pismenskaya
Summary: Modification of commercial ion-exchange membranes is the easiest and cheapest way to improve their properties. Treatment with a bifunctional polymer has been shown to reduce ion generation, increase limiting current density, shorten current-voltage curve plateau length, and improve stability. A partial separation of the modifier from the membrane surface in an electric field gradually increases the rate of ion generation.
MEMBRANES AND MEMBRANE TECHNOLOGIES
(2021)
Article
Chemistry, Physical
A. R. Achoh, V. Zabolotsky, K. A. Lebedev, M. Sharafan, A. B. Yaroslavtsev
Summary: The electrochemical properties of bilayer ion-exchange membranes with thick heterogeneous and thin homogeneous layers are studied in this research. A four-layer mathematical model is developed and a numerical approach for calculating specific selectivity coefficients is proposed. Experimental verification is conducted on two different electromembrane systems.
MEMBRANES AND MEMBRANE TECHNOLOGIES
(2021)
Article
Chemistry, Physical
N. V. Sheldeshov, V. I. Zabolotsky, T. V. Karpenko, N. V. Kovalev
MEMBRANES AND MEMBRANE TECHNOLOGIES
(2020)