Self-driven membrane filtration by core–shell polymer composites

Dou, Zeou; Wang, Ting; Chen, Wensi; Lin, Binhui; Dong, Hai; Sun, Wei; Xie, Xing

doi:10.1039/d0ta03617j

Cited by 15 publications

(8 citation statements)

References 33 publications

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“…36 Only recently, a passive selfdriven membrane filtration using a hydrogel core and a PA shell formed by GLIP has been demonstrated for concentrating analytes from an aqueous matrix. 37 One major drawback of this system is its nonreusability as the outer layer was found to have cracked during dehydration of the swollen gel at 60 °C. Also, they reported a relatively poor adhesion of the PA layer on the hydrogel surface.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Some works have reported use of this inherent delamination using the hydrogel-assisted GLIP process to produce thin-film composite membranes with high permeance , as well as to modify hydrogel surface roughness with a low coefficient of friction . Only recently, a passive self-driven membrane filtration using a hydrogel core and a PA shell formed by GLIP has been demonstrated for concentrating analytes from an aqueous matrix . One major drawback of this system is its nonreusability as the outer layer was found to have cracked during dehydration of the swollen gel at 60 °C.…”

Section: Introductionmentioning

confidence: 99%

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Highly Robust Interfacially Polymerized PA Layer on Thermally Responsive Semi-IPN Hydrogel: Toward On-Demand Tuning of Porosity and Surface Charge

Gupta

Liang

Chew

et al. 2021

ACS Appl. Mater. Interfaces

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Hydrogel composites with skin layer that allows fast and selective rejection of molecules possess high potential for numerous applications, including sample preconcentration for point-of-use detection and analysis. The stimuli-responsive hydrogels are particularly promising due to facile regenerability. However, poor adhesion of the skin layer due to swelling-degree difference during continuous swelling/deswelling of the hydrogel hinders its further development. In this work, a polyamide skin layer with strong adhesion was fabricated via gel−liquid interfacial polymerization (GLIP) of branched polyethyleneimine (PEI) with trimesoyl chloride (TMC) on a cross-linked N-isopropyl acrylamide hydrogel network containing dispersed poly sodium acrylate (PSA), while the traditional m-phenylenediamine (MPD)-TMC polyamide layer readily delaminates. We investigated the mechanistic design principle, which not only resulted in strong anchoring of the polyamide layer to the hydrogel surface but also enabled manipulation of the surface morphology, porosity, and surface charge by tailoring interfacial reaction conditions. The polyamide/hydrogel composite was able to withstand 100 cycles of swelling/deswelling without any delamination or a significant decrease in its rejection performance of the model dye, i.e., methylene blue. Regeneration can be done by deswelling the swollen beads at 60 °C, which also releases any loosely bound molecules together with absorbed water. This work provides insights into the development of a physically and chemically robust skin layer on various types of hydrogels for applications such as preconcentration, antifouling-coating, selective compound extraction, etc.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Robust Interfacially Polymerized PA Layer on Thermally Responsive Semi-IPN Hydrogel: Toward On-Demand Tuning of Porosity and Surface Charge

Gupta

Liang

Chew

et al. 2021

ACS Appl. Mater. Interfaces

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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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“…Thus, a self-driven three-dimensional (3D) filtration process is realized using SAP beads. Unlike normal filtration processes where filtrate passes through either a flat or hollow fiber filter driven by pressure difference, the filtrate spontaneously flows into the SAP beads from all directions . Due to their excellent water absorption properties, SAP beads have been investigated and applied for purification and concentration of various targets. − Nevertheless, the swelling of SAP beads can take a long time, especially when the ion concentration of the sample to be treated increases.…”

Section: Introductionmentioning

confidence: 99%

Microalgae Harvesting by Self-Driven 3D Microfiltration with Rationally Designed Porous Superabsorbent Polymer (PSAP) Beads

Chen

Wang

Dou

et al. 2021

Environ. Sci. Technol.

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Microalgae are emerging as next-generation renewable resources for production of sustainable biofuels and high-value bioproducts. Conventional microalgae harvesting methods including centrifugation, filtration, flocculation, and flotation are limited by intensive energy consumption, high capital cost, long treatment time, or the requirement of chemical addition. In this study, we design and fabricate porous superabsorbent polymer (PSAP) beads for self-driven 3D microfiltration of microalgal cultures. The PSAP beads can swell fast in a microalgal suspension with high water absorption capacity. During this process, microalgal cells are excluded outside the beads and successfully concentrated in the residual medium. After treatment, the beads can be easily separated from the microalgal concentrate and reused after dewatering. In one PSAP treatment, a high concentration factor for microalgal cultures up to 13 times can be achieved in 30 min with a harvesting efficiency higher than 90%. Furthermore, microalgal cultures could be concentrated from 0.2 g L–1 to higher than 120 g L–1 with minimal biomass loss through multistage PSAP treatments. Therefore, the use of PSAP beads for microalgae harvesting is fast, effective, and scalable. It does not require any complex instrument or chemical addition. This technique potentially provides an efficient and feasible alternative to obtain high concentrations of functional biomass at a very low cost.

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Self-driven membrane filtration by core–shell polymer composites

Abstract: A self-driven filtration process based on dynamic core–shell hydrogel absorbers of both high water absorbency and selectivity.

Cited by 15 publications

References 33 publications

Highly Robust Interfacially Polymerized PA Layer on Thermally Responsive Semi-IPN Hydrogel: Toward On-Demand Tuning of Porosity and Surface Charge

Highly Robust Interfacially Polymerized PA Layer on Thermally Responsive Semi-IPN Hydrogel: Toward On-Demand Tuning of Porosity and Surface Charge

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

Microalgae Harvesting by Self-Driven 3D Microfiltration with Rationally Designed Porous Superabsorbent Polymer (PSAP) Beads

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