Microstructural description of ion exchange membranes: The effect of PPy-based modification

Salmeron-Sanchez, Ivan; Asenjo‐Pascual, Juan; Avilés–Moreno, Juan Ramón; Ocón, P.

doi:10.1016/j.memsci.2022.120771

Cited by 10 publications

(15 citation statements)

References 43 publications

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“…In order to improve the membrane properties, the idea of clogging the membrane’s non-selective macropores with a homogeneous microporous ion-exchange material was realized in some studies [ 24 , 35 , 37 , 38 ]. This idea is based on the fact that relatively large (macro)pores are the pathway for coions through the membrane [ 35 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

“…The realization of this approach leaded to a 2.5-time decrease in the coion transport number in an anion-exchange membrane (CJMA-7, Hefei Chemjoy Polymer Materials Co., Ltd., Hefei, China) after its modification with the sulfonated fluoropolymer MF-4SK (JSC “Plastpolymer”, Saint Petersburg, Russia) [ 35 ]. The polypyrrole (PPy)-based modification of an FAA-3-50 membrane (Fumatech BWT Company, Bietigheim-Bissingen, Germany) resulted in a twofold increase in membrane conductivity [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

“…The literature shows that PPy-based modification is mainly used to obtain monovalent-ion-selective membranes [ 41 , 42 ]. As far as we know, only the paper of Salmeron-Sanchez et al [ 37 , 38 ] on PPy-based modification of IEMs was aimed at improving other membrane properties, namely, membrane conductivity, and this task was successfully solved in relatively dilute NaCl solutions (up to 0.04 M). Note that the authors used the microheterogeneous model (MHM) [ 43 ] to interpret their results.…”

Section: Introductionmentioning

confidence: 99%

“…The change in membrane properties after modification with PPy is explained by the presence of anion-exchange fixed groups in PPy, which leads to an increase in the total exchange capacity. From the point of view of the model, the presence of PPy causes an increase in the volume fraction of the gel phase and a decrease in the content of the electrically neutral solution filling the intergel spaces [ 38 ], which should lead to an increase in counterion permselectivity.…”

Section: Introductionmentioning

confidence: 99%

“…The MA-41 mod membrane is a membrane freshly obtained after modification; the MA-41 modED membrane is an MA-41 mod one used in an ED process. Like Salmeron-Sanchez et al [ 38 ], we apply a modification of the MHM [ 43 ] to describe the properties of the membranes under study. In addition to the membrane conductivity studied in Ref.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Is It Possible to Prepare a “Super” Anion-Exchange Membrane by a Polypyrrole-Based Modification?

et al. 2023

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In spite of wide variety of commercial ion-exchange membranes, their characteristics, in particular, electrical conductivity and counterion permselectivity, are unsatisfactory for some applications, such as electrolyte solution concentration. This study is aimed at obtaining an anion-exchange membrane (AEM) of high performance in concentrated solutions. An AEM is prepared with a polypyrrole (PPy)-based modification of a heterogeneous AEM with quaternary ammonium functional groups. Concentration dependences of the conductivity, diffusion permeability and Cl− transport number in NaCl solutions are measured and simulated using a new version of the microheterogeneous model. The model describes changes in membrane swelling with increasing concentration and the effect of these changes on the transport characteristics. It is assumed that PPy occupies macro- and mesopores of the host membrane where it replaces non-selective electroneutral solution. Increasing conductivity and selectivity are explained by the presence of positively charged PPy groups. It is found that the conductivity of a freshly prepared membrane reaches 20 mS/cm and the chloride transport number > 0.99 in 4 M NaCl. A choice of input parameters allows quantitative agreement between the experimental and simulation results. However, PPy has shown itself to be an unstable material. This article discusses what parameters a membrane can have to show such exceptional characteristics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Is It Possible to Prepare a “Super” Anion-Exchange Membrane by a Polypyrrole-Based Modification?

et al. 2023

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Determination of Tetracaine and Oxymetazoline in Drugs and Saliva via Potentiometric Sensor Arrays Based on Fluoropolymer/Polyaniline Composites

Parshina,

Yelnikova,

Shimbareva

et al. 2024

Journal of Chemometrics

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A growing interest in dental practice in intranasal anesthesia using tetracaine and oxymetazoline dictates the need for their simultaneous determination in combination drugs and human saliva. Potentiometric multisensory systems based on perfluorosulfonic acid membranes, including polyaniline‐modified ones, were developed for these purposes. A change in the distribution of the sensor sensitivity to the related analytes was achieved by variation of the conditions for concentration polarization at the membrane interface with a studied solution due to a change in the intrapore volume, nature, and availability of the sorption centers, as well as the hydrophilicity of the membrane surface that were specified by the conditions for their synthesis and subsequent hydrothermal treatment. Reversibility of the analyte sorption using the chosen conditions for regeneration provided long‐term stable work of both the sensors and the calibration equations established by multivariate linear regression. The membrane modification promoted their resistance to fouling. The relative errors of the simultaneous tetracaine and oxymetazoline determination in the combination drug solutions were no greater than 7% and 11%, while in the artificial saliva solutions, they were 15% and 17%, respectively, when an array of the cross‐sensitive sensors based on the composite membranes prepared by different methods was used. The analysis errors were reduced to 3%–6% when analyzing the drug and to 0.2%–6% when analyzing the artificial saliva if an array was organized with the sensors based on the membrane with the dopant and the membrane without it, due to the decreasing correlation between their responses.

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Fabrication and characterization of electrochemical membranes

Eniola,

Kujawa,

Nwokoye

et al. 2024

Electrochemical Membrane Technology

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Microstructural description of ion exchange membranes: The effect of PPy-based modification

Cited by 10 publications

References 43 publications

Is It Possible to Prepare a “Super” Anion-Exchange Membrane by a Polypyrrole-Based Modification?

Is It Possible to Prepare a “Super” Anion-Exchange Membrane by a Polypyrrole-Based Modification?

Determination of Tetracaine and Oxymetazoline in Drugs and Saliva via Potentiometric Sensor Arrays Based on Fluoropolymer/Polyaniline Composites

Fabrication and characterization of electrochemical membranes

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