Chitosan/polyvinyl alcohol/amino functionalized multiwalled carbon nanotube pervaporation membranes: Synthesis, characterization, and performance

Langari, Sepideh; Saljoughi, Ehsan; Mousavi, Seyed Mahmoud

doi:10.1002/pat.4091

Cited by 30 publications

(20 citation statements)

References 45 publications

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“…The increase of thermostability and a decrease of hydrophilicity were shown after the blending CS and PVA by TGA and contact angles. The PVA and CS membranes, modified by the amino functionalized multi-walled carbon nanotube (NH 2 -MWCNT), were used for the dehydration of IPA, whilst the membrane with 10 wt % of NH 2 -MWCNT showed the optimal transport performance [30].…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of New Pervaporation PVA Membranes for the Dehydration Using Bulk and Surface Modifications

et al. 2018

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In the present work, the novel dense and supported membranes based on polyvinyl alcohol (PVA) with improved transport properties were developed by bulk and surface modifications. Bulk modification included the blending of PVA with chitosan (CS) and the creation of a mixed-matrix membrane by introduction of fullerenol. This significantly altered the internal structure of PVA membrane, which led to an increase in permeability with high selectivity to water. Surface modification of the developed modified dense membranes, based on composites PVA-CS and PVA-fullerenol-CS, was performed through (i) making of a supported membrane with a thin selective composite layer and (ii) applying of the layer-by-layer assembly (LbL) method for coating of nano-sized polyelectrolyte (PEL) layers to increase the membrane productivity. The nature of polyelectrolyte type—(poly(allylamine hydrochloride) (PAH), poly(sodium 4-styrenesulfonate) (PSS), poly(acrylic acid) (PAA), CS), and number of PEL bilayers (2–10)—were studied. The structure of the composite membranes was investigated by FTIR, X-ray diffraction, and SEM. Transport properties were studied during the pervaporation separation of 80% isopropanol–20% water mixture. It was shown that supported membrane consisting of hybrid layer of PVA-fullerenol (5%)–chitosan (20%) with five polyelectrolyte bilayers (PSS, CS) deposited on it had the best transport properties.

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Section: Introductionmentioning

confidence: 99%

Development and Characterization of New Pervaporation PVA Membranes for the Dehydration Using Bulk and Surface Modifications

et al. 2018

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“…The feed and permeate composition were estimated by measuring the refractive index with an accuracy of ±0.0001 g using refractometer. Separation performance of the membranes was determined by flux (J), separation factor ( α i/j ), and pervaporation separation index (PSI) which were calculated by the following equations:

J = \frac{Q}{At}

α_{i / j} = \frac{\frac{y_{i}}{y_{j}}}{\frac{x_{i}}{x_{j}}}

italicPSI = J . ((), α - 1)

…”

Section: Methodsmentioning

confidence: 99%

“…Pervaporation experiments were carried out using a lab-scale apparatus illustrated in Figure 1. Separation performance of the membranes was determined by flux (J), separation factor (α i/j ), and pervaporation separation index (PSI) which were calculated by the following equations 23,25 :…”

Section: Pervaporation Experimentsmentioning

confidence: 99%

Poly (caprolactone)/poly (ethylene glycol) pervaporation blend membranes: Synthesis, characterization, and performance

Afsar

Saljoughi

Mousavi

2018

Polymers for Advanced Techs

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Poly (caprolactone) membranes with addition of different poly (ethylene glycol) concentrations were prepared for separation of water/isopropanol azeotropic mixture by pervaporation process. Different characterization tests including Fourier transform infrared, scanning electron microscopy, water contact angle, and thermogravimetric analysis were carried out on the prepared membranes. In addition, the effect of poly (ethylene glycol) PEG content on the swelling degree and the performance of the prepared membranes in pervaporation process were investigated. According to the obtained results, all the membranes were water selective and the blend membrane containing 3 wt% PEG exhibited the best pervaporation performance with a water flux of 0.517 kg/m2 hour and separation factor of 1642 at the ambient temperature. Hydrophilicity improvement of the blend membranes was confirmed by constant decrease in water contact angle of the membranes as PEG content increased in the casting solution. Scanning electron microscopy cross‐sectional images indicated that the blend membranes containing PEG had a closed cellular structure. Furthermore, mechanical and thermal properties of the membranes decreased by adding PEG.

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“…The majority of PV applications for dehydration are for the drying of alcohols such as methanol, ethanol and butanol [64][65][66]. In recent years, the development of PV membranes for such applications has been studied extensively, with the fabrication of membranes from a large range of hydrophilic materials [67][68][69][70][71][72]. Whilst there have been many materials used in alcohol dehydration processes, research has taken a distinct shift towards the use of chitosan based membranes [64,67,70,[73][74][75][76].…”

Section: Aqueous-organic Separationsmentioning

confidence: 99%

The potential of polymers of intrinsic microporosity (PIMs) and PIM/graphene composites for pervaporation membranes

et al. 2019

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Pervaporation (PV), a membrane process in which the feed is a liquid mixture and the permeate is removed as a vapour, offers an energy-efficient alternative to conventional separation processes such as distillation, and can be applied to mixtures that are difficult to separate, such as azeotropes. Here the principles of pervaporation and its industrial applications are outlined. Two classes of material that show promise for use in PV membranes are described: Polymers of intrinsic microporosity (PIMs) and 2D materials such as graphene. The literature regarding PV utilizing the prototypical PIM (PIM-1) and it hydrophilic hydrolysed form (cPIM-1) is reviewed. Self-standing PIM-1 membranes give competitive results compared to other membranes reported in the literature for the separation of alcohols and other volatile organic compounds from aqueous solution, and for organic/organic separations such as methanol/ethylene glycol and dimethyl carbonate/methanol mixtures. Blends of cPIM-1 with conventional polymers improve the flux for dehydration of alcohols. The incorporation of fillers, such as functionalised graphene-like fillers, into PIM-1 to form mixed matrix membranes can enhance the separation performance. Thin film composite (TFC) membranes enable very high fluxes to be achieved when a suitable support with high surface porosity is utilised. When functionalised graphene-like fillers are introduced into the selective layer of a TFC membrane, the lateral size of the flakes needs to be carefully controlled. There is a wide range of PIMs and 2D materials yet to be explored for PV applications, which offer potential to create bespoke membranes for a wide variety of organic/aqueous and organic/organic separations.

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Chitosan/polyvinyl alcohol/amino functionalized multiwalled carbon nanotube pervaporation membranes: Synthesis, characterization, and performance

Cited by 30 publications

References 45 publications

Development and Characterization of New Pervaporation PVA Membranes for the Dehydration Using Bulk and Surface Modifications

Development and Characterization of New Pervaporation PVA Membranes for the Dehydration Using Bulk and Surface Modifications

Poly (caprolactone)/poly (ethylene glycol) pervaporation blend membranes: Synthesis, characterization, and performance

The potential of polymers of intrinsic microporosity (PIMs) and PIM/graphene composites for pervaporation membranes

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