Zwitterionic microgel based anti(-bio)fouling smart membranes for tunable water filtration and molecular separation

Maity, Somnath; Mishra, Biswajit; Nayak, Kanupriya; Dubey, Nidhi C.; Tripathi, Bijay P.

doi:10.1016/j.mtchem.2022.100779

Cited by 17 publications

(21 citation statements)

References 93 publications

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“…Microgel immobilization on porous membranes provides an efficient strategy to develop membranes with integrated functions like smart-gating, stimuli-reversible and self-cleaning behaviors. 105,106 Additionally, to enhance the activity of immobilized enzymes on hydrophobic membrane, where wetting of the membrane pores is often prevented, hydrophilic microgel coating is formed on the membrane, followed by the immobilization of enzyme. The microgels are known to provide hydrated microenvironment to the enzymes conjugated to the hydrophobic membrane.…”

Section: Microgel On Membrane Support For Flow Catalysis and Controll...mentioning

confidence: 99%

Responsive microgels and microgel assemblies in biocatalytic applications

Dubey

Gaur

Tripathi

2023

Journal of Polymer Science

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Microgels are soft particles that offer excellent colloidal stability, large surface area, and fluid‐like transport characteristics, making them ideal for enzyme immobilization and reaction regulation. In recent years, the use of microgels in enzyme processes has rapidly increased and reviewed. Here in this review, we have provided a comprehensive overview of the strategies involved in microgel synthesis, practical aspects of microgel–enzyme conjugate formation, and the effects of microgel on enzyme stabilization and activities. In the end, we have discussed important biocatalytic applications of microgel and enzyme. The aim of this review is to provide a detailed understanding of enzyme–microgel conjugates and their potential applications, which can aid in the design of new microgels, responsive platforms, and biochemical applications.

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Section: Microgel On Membrane Support For Flow Catalysis and Controll...mentioning

confidence: 99%

Responsive microgels and microgel assemblies in biocatalytic applications

Dubey

Gaur

Tripathi

2023

Journal of Polymer Science

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“…Smart filtration membranes, where permeability can be controlled for advanced functions, such as size-selective rejection and permeate flux control, have recently been of increased research interest. − In many cases, permeability controls have been based on grafting pH- and temperature-responsive polymers on the membrane surfaces. − The reversible protonation of a polyelectrolyte with a weak acid and base provides a switchable brush-swelling mechanism through the charge repulsion between adjacent charges on the polymer backbones upon pH change. , The temperature-switchable polymer brush mechanism is mainly limited to poly( N -isopropyl acrylamide), ,− which exhibits an upper critical temperature above 32 °C. Although there have been a number of literature reports on the use of these polymer brushes as a pH and temperature switch for permeability control, − the implementation of such a switching system could be difficult when the filtration system requires an optimum or controlled pH or temperature range for the operation. For instance, in food and beverage applications, heat treatment or pH adjustment may result in quality issues such as alternating organoleptic properties and/or appearance, as well as affecting the filtration process − (e.g., kinematic viscosity of a liquid decreases with a higher temperature).…”

Section: Introductionmentioning

confidence: 99%

Permeate Flux Control of a Conductive Membrane through a PEDOT Redox Switch

Tollemache

Vella

et al. 2023

ACS Appl. Polym. Mater.

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A filtration membrane was modified with a conducting polymer coating for the permeate flux control through an electric input. The filtration membrane was first soaked in ferric chloride to load the oxidants on the membrane surface, followed by vapor-phase polymerization of 3,4-ethylenedioxythiophene (EDOT). Optimizations were carried out to balance the filtration performance and the electrical performance of the conductive membrane. Infrared spectroscopy and X-ray photoelectron spectroscopy confirmed the formation of PEDOT coatings on the membrane surfaces. Spectroelectrochemistry was carried out to confirm the reversible redox reactivity of the PEDOT coating when charged and discharged at +1 and −1 V. The permeate flux of the conductive membrane showed a switchable behavior during the PEDOT charging/discharging cycles. The swelling behavior of PEDOT coatings on the membrane in the charging/discharging cycle was confirmed by electrochemical atomic force microscopy with the ingress/egress of dopant ions being responsible for the membrane's switchable flux properties. The reversible redox switching behavior of the conductive polymer coating on the filtration membrane provides a potential application for permeate flux control through an electric input.

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“…Currently, the treatment of industrial wastewater has been approached from different angles (i.e., application of nanotechnology in water purification [ 18 ]; employ of metal organic frameworks (MOFs) [ 19 ]; use of ultrasounds technology [ 9 ]; membraneless approach [ 20 ]), which yielded in numerous valid experimental protocols, some of them fit for the technology transfer, and separation media. There is a wide variety of materials employed in wastewater purification (membranes, foams, gels, nonwoven mats, particles and fibers of micro- and nanometer scale) ranging from raw and functionalized natural polymers [ 21 , 22 , 23 ] to synthetic and mixed polymer membranes [ 24 , 25 ], composite materials [ 26 , 27 , 28 , 29 ], or even membranes [ 30 , 31 , 32 ] and nanoparticles of different nature [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Selective Oxidation of Cellulose—A Multitask Platform with Significant Environmental Impact

Duceac¹,

Tanasă²,

Coseri³

2022

Materials

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Raw cellulose, or even agro-industrial waste, have been extensively used for environmental applications, namely industrial water decontamination, due to their effectiveness, availability, and low production cost. This was a response to the increasing societal demand for fresh water, which made the purification of wastewater one of the major research issue for both academic and industrial R&D communities. Cellulose has undergone various derivatization reactions in order to change the cellulose surface charge density, a prerequisite condition to delaminate fibers down to nanometric fibrils through a low-energy process, and to obtain products with various structures and properties able to undergo further processing. Selective oxidation of cellulose, one of the most important methods of chemical modification, turned out to be a multitask platform to obtain new high-performance, versatile, cellulose-based materials, with many other applications aside from the environmental ones: in biomedical engineering and healthcare, energy storage, barrier and sensing applications, food packaging, etc. Various methods of selective oxidation have been studied, but among these, (2,2,6,6-tetramethylpiperidin-1-yl)oxyl) (TEMPO)-mediated and periodate oxidation reactions have attracted more interest due to their enhanced regioselectivity, high yield and degree of substitution, mild conditions, and the possibility to further process the selectively oxidized cellulose into new materials with more complex formulations. This study systematically presents the main methods commonly used for the selective oxidation of cellulose and provides a survey of the most recent reports on the environmental applications of oxidized cellulose, such as the removal of heavy metals, dyes, and other organic pollutants from the wastewater.

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Zwitterionic microgel based anti(-bio)fouling smart membranes for tunable water filtration and molecular separation

Cited by 17 publications

References 93 publications

Responsive microgels and microgel assemblies in biocatalytic applications

Responsive microgels and microgel assemblies in biocatalytic applications

Permeate Flux Control of a Conductive Membrane through a PEDOT Redox Switch

Selective Oxidation of Cellulose—A Multitask Platform with Significant Environmental Impact

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