Integrating biofouling sensing with fouling mitigation in a two-electrode electrically conductive membrane filtration system

Zhang, Nan; Lee, Hye-Jin; Wu, Yichen; Ganzoury, Mohamed A.; Lannoy, Charles‐François de

doi:10.1016/j.seppur.2022.120679

Cited by 14 publications

(21 citation statements)

References 40 publications

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“…Conversely, membrane permeance decreased with greater electroless coating duration of Ni-P coating, exhibiting 920 ± 40, 381.4 ± 58.6, 134.7 ± 22.9, and 101.2 ± 12.3 L/m 2 /h/bar (LMH/bar) for 1, 2, 3, and 4 min of coating, respectively. The relation among surface resistivity, permeance, and coating time was observed, as reported for different types of ECMs …”

Section: Resultsmentioning

confidence: 64%

“…Ni-P membranes were developed by electrolessly coating Ni-P nanoparticles on ultrafiltration PES membranes. Surface resistivity and transmembrane flux (and permeance) of electrically conductive membranes (ECMs) are a function of coating layer thickness. , Since the duration of electroless coating is directly proportional to the Ni-P layer thickness, the resistivity and permeance of Ni-P membranes were demonstrated under varying periods of electroless coating.…”

Section: Resultsmentioning

confidence: 99%

“…The lower surface resistivity with longer coating time was attributed to the higher coverage of conductive Ni-P nanoparticles. Conversely, membrane permeance decreased with greater electroless coating duration of 31 Lower resistivity leads to greater electrochemical reactivity and higher energy efficiency, while lower permeability increases the residence time and thereby increases the removal degree of contaminants at the expense of lower processing capacity. Taking the removal degree-processing capacity tradeoff into account, electrocatalytic membranes benefit from lower resistivity while maximizing higher permeance.…”

Section: Resultsmentioning

confidence: 99%

“…The electrical conductivity of Ni-P membranes was tested by a four-point probe (Ossila), and the testing procedures were reported in our previous work. 31 The pure water flux of Ni-P membranes was determined by measuring permeate flux at varying pressures in a dead-end filtration cell (Sterlitech) after membrane compression.…”

Section: Characterizationmentioning

confidence: 99%

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Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Zhang

Ganzoury

et al. 2023

ACS Appl. Nano Mater.

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Transition-metal phosphides (TMPs) are emerging electrocatalysts for both hydrogen evolution and the conversion of reactants/contaminants by various electrochemical reactions. TMPs are promising catalysts because they are earth abundant, have high electrical conductivity, and have high chemical stability. In this seminal work, a low-priced nickel phosphorus (Ni-P) ultrafiltration membrane was fabricated and used for electrochemical reductive dechlorination of chlorophenols. Amorphous Ni-P nanoparticles were grown on an ultrafiltration poly(ether sulfone) (PES) membrane via electroless deposition. The prepared Ni-P membrane was used as a cathode for electrochemical reductive dechlorination of 2-chlorophenol (2-CP) in flow-through mode. It was observed that a dechlorination efficiency of 42.7%, a reaction rate constant of 1.621 min–1, and a Faradaic efficiency of 24.5% were achieved at an optimized cathodic potential of −2.50 V. The dechlorination was primarily attributed to the partial positively charged Niδ+ on the Ni-P membrane surface, which facilitated atomic H* evolution by forming reactive Ni–H* bonds for dechlorination. Additionally, doping P atoms in Ni retarded the deactivation of electrocatalytic Ni sites. This work demonstrates that the cost-effective Ni-P membrane electrocatalyst is a promising technology to degrade chlorinated compounds with applications to industrial wastewaters and landfill leachates.

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Zhang

Ganzoury

et al. 2023

ACS Appl. Nano Mater.

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“…New technologies have been presented in the recent literature to reduce the impact of biofilm, as also ways of controlling its presence on the surface of sensors. Different active techniques based on ultraviolet [ 18 , 19 , 20 ], laser [ 21 , 22 ], direct electrification [ 23 , 24 ], bubbles [ 25 ], or acoustics [ 26 , 27 , 28 ] were demonstrated to be effective but presented high energetic requirements for continuous and long-term monitoring.…”

Section: Introductionmentioning

confidence: 99%

Design and In Situ Validation of Low-Cost and Easy to Apply Anti-Biofouling Techniques for Oceanographic Continuous Monitoring with Optical Instruments

Matos

Pinto

Sousa

et al. 2023

Sensors

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Biofouling is the major factor that limits long-term monitoring studies with automated optical instruments. Protection of the sensing areas, surfaces, and structural housing of the sensors must be considered to deliver reliable data without the need for cleaning or maintenance. In this work, we present the design and field validation of different techniques for biofouling protection based on different housing materials, biocides, and transparent coatings. Six optical turbidity probes were built using polylactic acid (PLA), acrylonitrile butadiene styrene (ABS), PLA with copper filament, ABS coated with PDMS, ABS coated with epoxy and ABS assembled with a system for in situ chlorine production. The probes were deployed in the sea for 48 days and their anti-biofouling efficiency was evaluated using the results of the field experiment, visual inspections, and calibration signal loss after the tests. The PLA and ABS were used as samplers without fouling protection. The probe with chlorine production outperformed the other techniques, providing reliable data during the in situ experiment. The copper probe had lower performance but still retarded the biological growth. The techniques based on transparent coatings, epoxy, and PDMS did not prevent biofilm formation and suffered mostly from micro-biofouling.

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Electrolyte migration through electrochemical membranes: Potential source of error in batch electrochemical cells

Ganzoury,

Wu,

de Lannoy

2023

Can J Chem Eng

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Electrochemical membranes (ECMs) and porous electrodes have gained much attention in a broad range of applications including water and wastewater treatment, energy production and storage, and carbon dioxide capture. Lab scale batch experiments (electrochemical stirred cells) are the baseline for developing ECMs and porous electrodes. We observed electrochemical dissolution of metal fasteners (alligator clips), used to hold porous conductive and non‐conductive membranes in batch electrochemical cells, despite being kept outside the electrolyte. The electrolyte migrated through the porous membranes by the action of capillary forces, forming a closed electrochemical circuit with the metal fasteners. This unexpected leaching can lead to misleading results for electrochemical experiments on porous electrodes and ECMs. In this study, we compared (1) porous membranes versus non‐porous electrodes, (2) hydrophilic versus hydrophobic membranes, and (3) conductive versus non‐conductive membranes in their ability to cause capillary wetting‐induced corrosion of metal fasteners. We proposed a simple solution for the problem: separating the metal fasteners from the porous membrane electrode with a non‐porous conductive graphite foil, which keeps the electrochemical circuit open. We have validated this solution and propose it as a standard method for experiments using porous electrodes and electrically conductive membranes.

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Integrating biofouling sensing with fouling mitigation in a two-electrode electrically conductive membrane filtration system

Cited by 14 publications

References 40 publications

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Design and In Situ Validation of Low-Cost and Easy to Apply Anti-Biofouling Techniques for Oceanographic Continuous Monitoring with Optical Instruments

Electrolyte migration through electrochemical membranes: Potential source of error in batch electrochemical cells

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