Electro-catalytic microfiltration membranes electrochemically degrade azo dyes in solution

Sutherland, Alex J.; Ruiz-Caldas, Maria-Ximena; Lannoy, Charles‐François de

doi:10.1016/j.memsci.2020.118335

Cited by 30 publications

(13 citation statements)

References 33 publications

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“…Electrically conductive membranes (ECMs) have demonstrated promising self-cleaning capabilities to control fouling, the major limitation of traditional separation processes. − An applied charge to ECMs’ surfaces promotes antifouling mechanisms at the membrane–water interface. These antifouling mechanisms include electrostatic repulsion of like-charged contaminates, electrochemical and electrocatalytic reactions, and enhanced electrophoretic mobility of foulant particles . Often applied as coatings to conventional polymeric membranes, ECMs controllably target foulants at their point of adhesion at the membrane/water interface.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the Impact of Electrically Conductive Membrane-Generated Hydrogen Peroxide and Extreme pH on the Viability of Escherichia coli Biofilms

Halali

Lannoy

2021

Ind. Eng. Chem. Res.

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Electrically conductive membranes (ECMs) self-induce antifouling mechanisms at their surface under certain applied electrical currents. Quantifying these mechanisms is critical to enhancing ECMs' self-cleaning performance. Local pH change and H 2 O 2 production are among the most important self-cleaning mechanisms previously hypothesized for ECMs. However, the impacts of these mechanisms have not previously been isolated and comprehensively studied. In this study, we quantified the individual impact of electrochemically induced acidic conditions, alkaline conditions, and H 2 O 2 concentration on model bacteria, Escherichia coli. To this end, we first quantified the electrochemical potential of carbon nanotube-based ECMs to generate stressors, such as protons, hydroxyl ions, and H 2 O 2 , under a range of applied electrical currents (±0−150 mA, 0−2.7 V). Next, these chemical stressors with similar magnitude to that generated at the ECM surfaces were imposed on E. coli cells and biofilms. In the flow-through ECM systems, biofilm viability using LIVE/DEAD staining indicated biofilm viabilities of 39 ± 9.9%, 38 ± 4.7%, 45 ± 5.0%, 34 ± 3.1%, and 75 ± 4.9% after separate exposure to pH 3.5, anodic potential (2 V), pH 11, cathodic potential (2 V), and H 2 O 2 concentration (188 μM). Electrical current-induced pH change at the membrane surface was shown to be more effective in reducing bacterial viability than H 2 O 2 generation and more efficient than bulk pH changes. This study identified antibiofouling mechanisms of ECMs and provides guidance for determining the current patterns that maximize their antifouling effects.

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Section: Introductionmentioning

confidence: 99%

Quantifying the Impact of Electrically Conductive Membrane-Generated Hydrogen Peroxide and Extreme pH on the Viability of Escherichia coli Biofilms

Halali

Lannoy

2021

Ind. Eng. Chem. Res.

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“…134 Recent studies investigated NP-decorated photocatalytic membranes having visible light response. Wang et al 134 Results in this section suggest that post membrane surface modification by nanomaterials, adsorption (electrostatic attraction, 122 hydrophobic effect, 115 π−π interaction, and hydrogen bonding 44,65 ), size exclusion, 106,117,126 electrostatic repulsion, 109,131 and nanomaterial-assisted degradation (electro-oxidation, 110,142,143,149 electro- 144 or chemical-reduction, 150 and photocatalytic degradation 120 ) favored the removal of charged/uncharged dyes, phenols, and aromatic PPCPs. The reported effectiveness of each of these processes varies, where we for instance found that most dye compounds were shown to have high removals (>90%) merely based on nanoenhanced physical interactions, whereas removals of PPCPs with various sizes, charges, hydrophilicities, and chemical structures were generally lower (>60%), even combined with nanoassisted catalytic degradations.…”

Section: Nanocomposite Polymeric Membranes For Omp Removalmentioning

confidence: 89%

Nanocomposite Polymeric Membranes for Organic Micropollutant Removal: A Critical Review

Chen

Lee

et al. 2022

ACS EST Eng.

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The prevalence of organic micropollutants (OMPs) and their persistence in water supplies have raised serious concerns for drinking water safety and public health. Conventional water treatment technologies, including adsorption and biological treatment, are known to be insufficient in treating OMPs and have demonstrated poor selectivity toward a wide range of OMPs. Pressure-driven membrane filtration has the potential to remove many OMPs detected in water with high selectivity as a membrane's molecular weight cutoff (MWCO), surface charge, and hydrophilicity can be easily tailored to a targeted OMP's size, charge and octanol−water partition coefficient (K ow ). Over the past 10 years, polymeric (nano)composite microfiltration (MF), ultrafiltration (UF), and nanofiltration (NF) membranes have been extensively synthesized and studied for their ability to remove OMPs. This review discusses the fate and transport of emerging OMPs in water, an assessment of conventional membrane-based technologies (NF, reverse osmosis (RO), forward osmosis (FO), membrane distillation (MD) and UF membrane-based hybrid processes) for their removal, and a comparison to the state-of-the-art nanoenabled membranes with enhanced selectivity toward specific OMPs in water. Nanoenabled membranes for OMP treatment are further discussed with respect to their permeabilities, enhanced properties, limitations, and future improvements.

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“…The application of an electric potential to an ECM promotes various antifouling mechanisms at the membrane/water interface [6] , [7] , [8] , [9] , [10] . These antifouling mechanisms include electrostatic repulsion of like-charged foulants [11] , electrochemical [12] and electrocatalytic [13] reactions, and gas generation [14] . ECMs have presented several advantages as compared to conventional membranes such as: (a) controllably target foulants at the membrane/water interface which makes them more effective than traditional bulk solution cleaning (biocide dosing, pH adjustment) [15] , [16] , [17] , (b) use electrons, “clean reagents”, as antifouling mediators, making the process less chemical intense and easy to operate, which reduces the handling and storage costs of chemicals [18] , [19] , [20] , and (c) can tailor their antifouling mechanisms by tuning the applied electrical properties (polarity, magnitude, and frequency).…”

Section: Methods Detailsmentioning

confidence: 99%

Methods for stability assessment of electrically conductive membranes

Halali

Lannoy

2022

MethodsX

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Electro-catalytic microfiltration membranes electrochemically degrade azo dyes in solution

Cited by 30 publications

References 33 publications

Quantifying the Impact of Electrically Conductive Membrane-Generated Hydrogen Peroxide and Extreme pH on the Viability of Escherichia coli Biofilms

Quantifying the Impact of Electrically Conductive Membrane-Generated Hydrogen Peroxide and Extreme pH on the Viability of Escherichia coli Biofilms

Nanocomposite Polymeric Membranes for Organic Micropollutant Removal: A Critical Review

Methods for stability assessment of electrically conductive membranes

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