Effect of Bentonite Clay on the Mechanical, Thermal, and Pervaporation Performance of the Poly(vinyl alcohol) Nanocomposite Membranes

Jose, Thomasukutty; George, Soney C.; Maya, M.G.; Maria, Hanna J.; Wilson, Runcy; Thomas, Sabu

doi:10.1021/ie502632p

Cited by 86 publications

(42 citation statements)

References 62 publications

(79 reference statements)

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“…The mass transport of binary mixtures through a membrane in the pervaporation process follows the solution–diffusion mechanism, which occurs in a three‐step process: sorption, diffusion, and evaporation. The permeation rate and selectivity are governed by the solubility and diffusivity of each component of the feed . In pervaporation, to establish the fast equilibrium distribution between the bulk feed and the upstream membrane surface, the diffusion step tends to control the migration of the penetrants .…”

Section: Resultsmentioning

confidence: 99%

“…To discuss the separation mechanism further and to compare it with other works reported, permeability, P i of the i component in pervaporation was obtained with the following equation:

P_{i} = \frac{J_{i} δ}{p_{i, f}^{vapor} - y_{i, p} p_{p}} = \frac{J {normalY}_{i} δ}{x_{i} γ_{i} p_{i}^{s} - y_{i, p} p_{p}}

where J i is the permeate flux of the i th component; Y i is the weight fraction of the i th component in the permeate; δ is the membrane thickness;

p_{_{i, f}}^{^{vapor}}

and y i,p p p are the partial pressures in the feed and permeate stream, respectively; and x i is the mass fraction of the i th component in the feed mixture. The partial pressure (

p_{i}^{S}

) was obtained from the Antoine equation for the saturated vapor pressure.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Poly(ether sulfone) supported hybrid poly(vinyl alcohol)–maleic acid–silicone dioxide membranes for the pervaporation separation of ethanol–water mixtures

Xie

et al. 2017

J of Applied Polymer Sci

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Microporous poly(ether sulfone) (PES) supported hybrid polymer–inorganic membranes were prepared by the crosslinking of poly(vinyl alcohol) (PVA), maleic acid (MA), and SiO2 via an aqueous sol–gel route and a solution‐casting method. The membrane performance was tested for the pervaporation separation of ethanol–water mixtures from 20 to 60 °C with a feed ethanol concentration of 96 wt %. The membrane characterization results reveal that different SiO2 loadings affected the crystallinity and roughness of the membranes. The PVA–MA–SiO2 membrane containing 10 wt % SiO2 showed that SiO2 nanoparticles were well dispersed within the polymer matrix; this resulted in significant enhancements in both the flux and selectivity. The membrane achieved a high water permeability of 1202 g·μm·m−2 h−1 kPa−1 and a selectivity of 1027 for the separation of a 96 wt % ethanol‐containing aqueous solution. This enhanced membrane performance might have been due to the dense crosslinking membrane network, increased free volume, and uniform distribution of SiO2 nanoparticles. Both the water and ethanol fluxes increased with the feed water concentration and temperature. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44839.

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Section: Resultsmentioning

confidence: 99%

“…To discuss the separation mechanism further and to compare it with other works reported, permeability, P i of the i component in pervaporation was obtained with the following equation:

P_{i} = \frac{J_{i} δ}{p_{i, f}^{vapor} - y_{i, p} p_{p}} = \frac{J {normalY}_{i} δ}{x_{i} γ_{i} p_{i}^{s} - y_{i, p} p_{p}}

where J i is the permeate flux of the i th component; Y i is the weight fraction of the i th component in the permeate; δ is the membrane thickness;

p_{_{i, f}}^{^{vapor}}

and y i,p p p are the partial pressures in the feed and permeate stream, respectively; and x i is the mass fraction of the i th component in the feed mixture. The partial pressure (

p_{i}^{S}

) was obtained from the Antoine equation for the saturated vapor pressure.…”

Section: Methodsmentioning

confidence: 99%

Poly(ether sulfone) supported hybrid poly(vinyl alcohol)–maleic acid–silicone dioxide membranes for the pervaporation separation of ethanol–water mixtures

Xie

et al. 2017

J of Applied Polymer Sci

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show abstract

“…Many modifications in the composition were tested in order to find the most suitable for the hydrogel film preparation (Table S1). Differently from the previously developed films [36], bentonite nanoclay was introduced in the composition as filler [39] to improve the hydrogel film mechanical properties. A preliminary selection was made based on the following criteria: (i) hydrogel aspect (homogeneity and consistency) and physical stability, (ii) easy casting (difficult for very viscous gels) and (iii) final film appearance (detection of visible imperfection under visual inspection).…”

Section: Hydrogel Film Preparationmentioning

confidence: 99%

Bioadhesive Polymeric Films Based on Red Onion Skins Extract for Wound Treatment: An Innovative and Eco-Friendly Formulation

et al. 2020

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The onion non-edible outside layers represent a widely available waste material deriving from its processing and consumption. As onion is a vegetable showing many beneficial properties for human health, a study aiming to evaluate the use of extract deriving from the non-edible outside layers was planned. An eco-friendly extraction method was optimized using a hydroalcoholic solution as solvent. The obtained extract was deeply characterized by in vitro methods and then formulated in autoadhesive, biocompatible and pain-free hydrogel polymeric films. The extract, very soluble in water, showed antioxidant, radical scavenging, antibacterial and anti-inflammatory activities, suggesting a potential dermal application for wounds treatment. In vitro studies showed a sustained release of the extract from the hydrogel polymeric film suitable to reach concentrations necessary for both antibacterial and anti-inflammatory activities. Test performed on human keratinocytes showed that the formulation is safe suggesting that the projected formulation could be a valuable tool for wound treatment.

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“…Na Bentonit_1-80_Dowanol_1h Na Bentonit_1-80_Etildiglikol_1h philic nature of bentonite is attached to its polar interaction between bentonite and solvent [8] [9]. At the same time, when solution concentration is decreased, the water contact angle is decreased [10].…”

Section: X-ray Diffraction Analysis (Xrd)mentioning

confidence: 99%

Modification of Clay Crystal Structure with Different Alcohols

Seydibeyoğlu¹,

Demiroglu²,

Atagür³

et al. 2017

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Clays attract attention as a nano size material to reinforce the polymers and resins. In this study, montmorillonite clay was modified using industrial solvents that are used in the paint industry. It was shown that the water contact angle could be varied from 20˚ to 140˚ which is a real influence for the clay mineral. X-ray diffraction analysis shows that planar basal space could be altered significantly from 12.57 to 15.40 nm showing 22.5% increase in the interlayer spacing and that is really critical for many polymers and coating applications. This study will highlight many new clay nanocomposites and the formation of various clay nanocomposites.

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Effect of Bentonite Clay on the Mechanical, Thermal, and Pervaporation Performance of the Poly(vinyl alcohol) Nanocomposite Membranes

Cited by 86 publications

References 62 publications

Poly(ether sulfone) supported hybrid poly(vinyl alcohol)–maleic acid–silicone dioxide membranes for the pervaporation separation of ethanol–water mixtures

Poly(ether sulfone) supported hybrid poly(vinyl alcohol)–maleic acid–silicone dioxide membranes for the pervaporation separation of ethanol–water mixtures

Bioadhesive Polymeric Films Based on Red Onion Skins Extract for Wound Treatment: An Innovative and Eco-Friendly Formulation

Modification of Clay Crystal Structure with Different Alcohols

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