A pH-stable positively charged composite nanofiltration membrane with excellent rejection performance

Jiang, Zhibin; Miao, Jinshui; He, Yuantao; Hong, Xinjun; Tu, Kai; Wang, Xi; Chen, Shunquan; Yang, Hao; Zhang, Ling; Zhang, Rui

doi:10.1039/c9ra06528h

Cited by 30 publications

(19 citation statements)

References 31 publications

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“…Notably, the steric and electronic considerations of amine and isocyanate groups may also impact the rate of polymerization. 52,53 The chemical structures of the monomers evaluated are depicted in Figure 1 and their solubility or miscibility with IL and octane are shown in Table S2. The diamines hexamethylenediamine (HMDA) and 4,4 0 -diaminodiphenylmethane (DAPM) were both soluble in IL and insoluble in octane.…”

Section: Resultsmentioning

confidence: 99%

“…Alkyl-amines are more electron-rich than aryl amines of other monomers. 52,53 At higher CO 2 pressures, these amine sites would get saturated and additional capacity would only be due to uptake by the IL. Therefore, the overall gravimetric CO 2 capacity at 760 Torr is smaller for HMDA-HDI than for the agitated [BMIM][PF 6 ] since the capsule mass is about 70 wt % IL.…”

Section: Resultsmentioning

confidence: 99%

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Capsules with polyurea shells and ionic liquid cores for CO₂ capture

Gaur

Edgehouse

Klemm

et al. 2021

Journal of Polymer Science

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Many ionic liquids (ILs) have good solubilities of CO 2 but the high viscosity of ILs makes them cumbersome and kinetically limits gas uptake. Encapsulation of ILs is an effective approach to overcoming these limitations. In capsules with a core of IL, the chemical composition of the shell impacts performance.Here, we report the preparation of capsules with a core of the IL [Bmim][PF 6 ] and polymer composite shell, then evaluate how the identity of the polymer impacts CO 2 uptake. IL-in-oil Pickering emulsions stabilized by nanosheets are used, with capsules formed by interfacial polymerization between different diamines and diisocyanates (e.g., shells are polyurea and nanosheets). The capsules contain 60-80 wt% IL and the composition was verified using Fourier transform infrared spectroscopy. Optical microscopy, scanning electron microscopy, and particle sizing data showed spherical, discrete capsules with 50-125 μm in diameter. All capsules are stable up to 250 C. Brunauer-Emmett-Teller analysis of CO 2 gas uptake data showed that different polymer compositions led to different CO 2 uptake properties, with capacity ranging from 0.065 to 0.025 moles of CO 2 /kg sorbent at 760 torr and 20 C. This work demonstrates that the polymer identity of the shell impacts gas uptake properties and supports that shell composition can tailor performance.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Capsules with polyurea shells and ionic liquid cores for CO₂ capture

Gaur

Edgehouse

Klemm

et al. 2021

Journal of Polymer Science

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“…[ 8–10 ] The topological morphology of the interfacial polymerization substrate is very important for the construction of supramolecular crosslinking polymers. We believe that the combination of interfacial polymerization [ 11,12 ] and electrospinning technology [ 13 ] could be a good universal method for preparing composite nanofiltration membranes, the structures and properties of which can be controlled by means of surface modification, [ 14 ] adjustment of the electrospinning parameters, [ 15 ] and the addition of functional nanoparticles to the spinning solution.…”

Section: Methodsmentioning

confidence: 99%

Electrospinning Oriented Self‐Cleaning Porous Crosslinking Polymer for Efficient Dyes Removal

Chen

et al. 2020

Adv Materials Inter

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used to selectively separate molecules on the basis of their electrical properties or shapes. [8-10] The topological morphology of the interfacial polymerization substrate is very important for the construction of supramolecular crosslinking polymers. We believe that the combination of interfacial polymerization [11,12] and electrospinning technology [13] could be a good universal method for preparing composite nanofiltration membranes, the structures and properties of which can be controlled by means of surface modification, [14] adjustment of the electrospinning parameters, [15] and the addition of functional nanoparticles to the spinning solution. Membrane separation technology is now widely used in pollutant treatment. [16-18] However, contamination of porous membrane surfaces is a bottleneck that prevents even wider use of this technology. [19-22] After dye-containing wastewater is filtered, membranes are generally recycled by washing with organic solvents, but this process generates dye-containing organic solvent waste. If this new waste is not handled properly, the dissolved dyes can re-enter the environment and cause secondary pollution. Therefore, the development of innovative methods for controlling membrane surface structure and preparing self-cleaning membranes would be highly valuable. [23,24] Self-cleaning membranes responding to environmental stimuli such as magnetic fields, [25] temperature fluctuations, [26] and light [27,28] can cause changes in water flux and surface characteristics. Among the various stimulusresponsive materials, photocatalytic materials have attracted considerable attention; [29-31] and TiO 2 is of particular interest because of its high catalytic activity, good chemical stability, low cost, and low toxicity. [32,33] In the current study, we interfacially polymerized β-cyclodextrin and four crosslinking agents on polyacrylonitrile (PAN) electrospun nanofibrous substrates with different morphologies (depending on the PAN concentration and the spinning orientation), and we investigated the utility of the resulting composite membranes for dye removal from aqueous solution. If TiO 2 was incorporated in the PAN electrospun nanofibrous substrate, UV irradiation of the used composite membranes efficiently degraded the adsorbed dye, rendering the composite membranes self-cleaning and thus reusable (Scheme 1). First, electrospinning technology was used to fabricate nanofibrous PAN and PAN/TiO 2 membranes with controlled fiber diameter and morphology. Then, β-cyclodextrin and The separation of harmful substances by supramolecular crosslinking polymers is the focus of current research. As far as it is known, supramolecular crosslinking systems based on electrospun nanofibers are rarely reported. However, electrospun nanofibers should be promising candidates for interfacial crosslinking substrates because of their adjustable morphology and can be doped with different functional nanoparticles. In this study, β-cyclodextrin and acyl chloride compounds are interfacially polymerized on polya...

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“…The strong hindrance effect of chloride group in the molecules of CC could protect the amido group from the attack of OH – . Their results showed that the resulting PA layer structure and its separation performance could keep stable in alkali aqueous solution (pH 13) for 30 days [52].…”

Section: High‐performance Nf Membranes For Bio‐separationmentioning

confidence: 99%

Nanofiltration membrane for bio‐separation: Process‐oriented materials innovation

Cao

Chen

Wan

et al. 2021

Engineering in Life Sciences

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Nanofiltration (NF) with advantages of high efficiency and low‐cost has attracted increasing attentions in bio‐separation. However, the large‐scale application is limited by the inferior molecular selectivity, low chemical stability and serious membrane fouling. Many efforts, thus, have been devoted in NF materials design for specific applications to enhance the separation efficiency of bio‐products and increase membrane life‐time, as well as reduce the operating cost. This review summarized the recent progress of NF applications in bio‐separation, discussed various demands for NF membrane in the bio‐products purification and corresponding material innovations, finally proposed several practical suggestions for future research, which provided directions and guidance toward further product development and process industrialization.

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A pH-stable positively charged composite nanofiltration membrane with excellent rejection performance

Abstract: A pH-stable positively charged composite nanofiltration (NF) membrane was developed via the interfacial polymerization (IP) between polyethyleneimine (PEI), piperazine (PIP), and cyanuric chloride (CC).

Cited by 30 publications

References 31 publications

Capsules with polyurea shells and ionic liquid cores for CO₂ capture

Capsules with polyurea shells and ionic liquid cores for CO₂ capture

Electrospinning Oriented Self‐Cleaning Porous Crosslinking Polymer for Efficient Dyes Removal

Nanofiltration membrane for bio‐separation: Process‐oriented materials innovation

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A pH-stable positively charged composite nanofiltration membrane with excellent rejection performance

Abstract: A pH-stable positively charged composite nanofiltration (NF) membrane was developed via the interfacial polymerization (IP) between polyethyleneimine (PEI), piperazine (PIP), and cyanuric chloride (CC).

Cited by 30 publications

References 31 publications

Capsules with polyurea shells and ionic liquid cores for CO2 capture

Capsules with polyurea shells and ionic liquid cores for CO2 capture

Electrospinning Oriented Self‐Cleaning Porous Crosslinking Polymer for Efficient Dyes Removal

Nanofiltration membrane for bio‐separation: Process‐oriented materials innovation

Contact Info

Product

Resources

About

Capsules with polyurea shells and ionic liquid cores for CO₂ capture

Capsules with polyurea shells and ionic liquid cores for CO₂ capture