Surface modification of anion exchange membrane using layer-by-layer polyelectrolytes deposition facilitating monovalent organic acid transport

Chandra, Anusha; Bhuvanesh, E.; Mandal, Priyabrata; Chattopadhyay, Sujay

doi:10.1016/j.colsurfa.2018.09.013

Cited by 34 publications

(9 citation statements)

References 31 publications

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“…The efficiency of ED depends on device structure (e.g., spacer thickness and geometry, number of cell pairs in the stack), membrane properties (e.g., material chemistry, concentration of the fixed ionic moiety), ,− electrode design (e.g., capacitive flow or membrane electrode, electrode redox couple), operating conditions (e.g., electric potential, current density, hydrodynamics, temperature), and feed composition. , On the basis of their structure, commercial IEMs are classified as either homogeneous or heterogeneous . A homogeneous IEM generally displays higher conductivity and permselectivity compared to a heterogeneous membrane because the latter comprises a larger insulating phase in its matrix as a result of the fabrication method. , A heterogeneous IEM, on the other hand, often has greater mechanical strength and is less expensive to manufacture .…”

Section: Electrokinetic Separationsmentioning

confidence: 99%

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

et al. 2022

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Agricultural development, extensive industrialization, and rapid growth of the global population have inadvertently been accompanied by environmental pollution. Water pollution is exacerbated by the decreasing ability of traditional treatment methods to comply with tightening environmental standards. This review provides a comprehensive description of the principles and applications of electrochemical methods for water purification, ion separations, and energy conversion. Electrochemical methods have attractive features such as compact size, chemical selectivity, broad applicability, and reduced generation of secondary waste. Perhaps the greatest advantage of electrochemical methods, however, is that they remove contaminants directly from the water, while other technologies extract the water from the contaminants, which enables efficient removal of trace pollutants. The review begins with an overview of conventional electrochemical methods, which drive chemical or physical transformations via Faradaic reactions at electrodes, and proceeds to a detailed examination of the two primary mechanisms by which contaminants are separated in nondestructive electrochemical processes, namely electrokinetics and electrosorption. In these sections, special attention is given to emerging methods, such as shock electrodialysis and Faradaic electrosorption. Given the importance of generating clean, renewable energy, which may sometimes be combined with water purification, the review also discusses inverse methods of electrochemical energy conversion based on reverse electrosorption, electrowetting, and electrokinetic phenomena. The review concludes with a discussion of technology comparisons, remaining challenges, and potential innovations for the field such as process intensification and technoeconomic optimization.

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Section: Electrokinetic Separationsmentioning

confidence: 99%

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

et al. 2022

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“…Adsorption phenomena of DPA molecules with positively charged AEL matrix may be analyzed using two major mechanisms: (i) electrostatic interactions between charged carboxylate anions of DPA (at pH 7.0, DPA exists in the dianionic form, DPA 2− ) in solution and counterionic (−NR 3 + ) fixed charges of AEL and (ii) physisorption due to van der Waals interactions between undissociated acid groups and neutral aromatic ring of DPA. Similar interactions of weak carboxylic acid groups with AEM were earlier reported by Chandra et al 41,42 Thus, DPA concentrations of 0.2, 0.5, and 1.0 mg•mL −1 were chosen for dip coating, to introduce DPA as the interface layer in BPM. Additionally, the deposition of DPA over the surface of AEL was confirmed by the EDS technique (Figure S13).…”

Section: Resultsmentioning

confidence: 72%

Potential of Dipicolinic Acid as a Water-Dissociating Catalyst in a Bipolar Membrane

Eswaraswamy

Mandal

Goel

et al. 2021

ACS Appl. Polym. Mater.

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Bipolar membranes (BPMs) are increasingly being applied in chemical recovery and energy storage fields due to their unique water dissociation ability under reverse bias. BPMs capable of dissociating water at a lower potential will minimize energy consumption, and it depends on the thickness asymmetry between the cation exchange layer (CEL)/anion exchange layer (AEL) and the right catalyst material used at the interface of CEL/AEL. In this report, a heteroaromatic compound, 2,6-pyridine-dicarboxylic acid (also known as dipicolinic acid, DPA), is being proposed to be an effective interface catalyst for BPM made of sulfonated poly(ether ether ketone) (CEL) and quaternized polysulfone (AEL). The optimum concentration of DPA as an interface layer over fabricreinforced AEL was found using an adsorption study. The thickness asymmetry between CEL and AEL (without catalyst) alone could lower the water dissociation onset potential (U diss ) to 0.72 V, which was further reduced to 0.70 V using DPA as an interface catalyst. After 5 h of electrodialysis experiments at 25 mA• cm −2 , the acid (or base) concentration increased from ∼0.19 mol•L −1 (without catalyst) to 0.21 mol•L −1 due to the presence of DPA at the interface. Meanwhile, operational studies performed using synthetic reverse osmosis (RO) reject of sea water confirm the consistency in the acid−base production during multiple cycles.

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“…While, application of homogeneous SPEEK layer (Figure 6B–D) would separate CEL/AEL made of common binder and results in distinguishable interface. Thus, in addition to hydrophilicity and catalytic effect of SPEEK layer, probably formation of distinguishable interface (Figure 6D) may also resulted in lowering of U diss in HBMs 44,45 …”

Section: Resultsmentioning

confidence: 99%

Nanocomposite interface coupled with thickness optimization promoting water dissociation in heterogeneous bipolar membrane

Eswaraswamy

Goel

Mandal

et al. 2021

Polymers for Advanced Techs

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Bipolar membranes (BPMs) are multilayered composite film containing an interface layer sandwiched between cation exchange layer (CEL) and anion exchange layer (AEL), and are capable of dissociating water molecules under reverse bias potential. Woven fabric supported heterogeneous bipolar membranes (HBMs) were synthesized adopting layer‐by‐layer solvent casting technique. Nanocomposite layer based on sulfonated polyether ether ketone (SPEEK) and GO (graphene oxide) were applied at the interface of CEL/AEL made of cation/anion exchange resins and poly (vinyl chloride) as binder to advance water dissociation in HBMs. Thickness of monopolar layers were initially optimized without any interfacial layer. Introduction of SPEEK interface substantially lowered onset water dissociation potential, Udiss (~1.87 V) relative to the HBM without interface (~3.27 V), which got further reduced (~1.80 V) by nanocomposite (GO + SPEEK) interface. Udiss recorded with SPEEK + GO as interface was much lower than some of the recently reported homogeneous BPM. The NaOH production from NaCl (1.0 mol⋅L−1) solution in a bipolar membrane electrodialysis set up containing synthesized HBM with nanocomposite interface (SPEEK + GO) was double than that of NaOH concentration obtained with HBM having no interface, where the current density was fixed at 50.0 mA·cm−2. Careful optimization of monopolar/interface layer thickness and composition of nanocomposite interface results in developing cost effective HBMs facilitating water dissociation at lower potential.

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Surface modification of anion exchange membrane using layer-by-layer polyelectrolytes deposition facilitating monovalent organic acid transport

Cited by 34 publications

References 31 publications

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

Potential of Dipicolinic Acid as a Water-Dissociating Catalyst in a Bipolar Membrane

Nanocomposite interface coupled with thickness optimization promoting water dissociation in heterogeneous bipolar membrane

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