Analysis of annealing effect on pervaporation properties of PVA-GPTMS hybrid membranes through PALS

Peng, Feifei; Lu, Lianyu; Sun, Honglei; Jiang, Zhongyi

doi:10.1016/j.memsci.2006.04.031

Cited by 49 publications

(31 citation statements)

References 20 publications

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“…Based on Fick's law, the permeation flux of component i can be expressed as [9,16,17] For simplicity, the apparent diffusion coefficient can be calculated by the equation [17]:…”

Section: Pervaporation Testingmentioning

confidence: 99%

“…The combination of these two different building blocks at a molecular level could provide novel properties that are not obtained from conventional organic or inorganic materials [6][7][8][9]. The sol-gel method is a common process to synthesise polymer-inorganic nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

“…Among various insolubilisation techniques, hybridisation between PVA and inorganic particles has received significant interest as it not only restricts the swelling of PVA but also provides the inherent advantages of the organic and inorganic compounds [14]. Previous studies have shown that introducing an inorganic component derived from Si-containing precursors into PVA can form a homogeneous nanocomposite membrane with enhanced physicochemical stability and separation performance in pervaporation separation of benzene/cyclohexane mixtures [9,15] and aqueous ethanol solution [15]. However, there is little published result on application of this type of membranes for pervaporation desalination.…”

Section: Introductionmentioning

confidence: 99%

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Sol–gel derived poly(vinyl alcohol)/maleic acid/silica hybrid membrane for desalination by pervaporation

Xie

Hoang

Duong

et al. 2011

Journal of Membrane Science

136

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Highly dispersed homogeneous hybrid polymer-inorganic membranes based on poly(vinyl alcohol) (PVA), maleic acid (MA) and inorganic silica were synthesized via a sol-gel method. Tetraethoxy-silane (TEOS) was used as the silica precursor with MA as an additional crosslinking agent. A range of techniques such as FTIR, SEM, TGA, XRD and DSC were used to characterise the nanostructure and properties of hybrid membranes. Results revealed silica nanoparticles (<10 nm) were well dispersed in the polymer matrix with chemical bonding between the organic and inorganic phases. Thermal properties of the hybrid membranes were significantly enhanced when compared with pure PVA membranes, and swelling of PVA based hybrid membranes was greatly suppressed.The chemically crosslinked PVA with maleic acid and silica resulted in the formation of new hybrid membranes with improved pervaporation properties for desalination application. The pervaporation separation performance of aqueous salt solution was found to be directly related to the diffusion coefficient of water through hybrid PVA/MA/silica membranes. Introduction of MA and silica at given amounts into the polymer chain increased the amorphous region of the membrane and favoured the diffusion of water molecules through the membrane. A water flux of 6.93 kg/m 2 ·hr with salt rejection of >99.5% was achieved at a 6 Torr vacuum and 22°C.

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“…Based on Fick's law, the permeation flux of component i can be expressed as [9,16,17] For simplicity, the apparent diffusion coefficient can be calculated by the equation [17]:…”

Section: Pervaporation Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sol–gel derived poly(vinyl alcohol)/maleic acid/silica hybrid membrane for desalination by pervaporation

Xie

Hoang

Duong

et al. 2011

Journal of Membrane Science

136

View full text Add to dashboard Cite

show abstract

“…Hybrid organic-inorganic membrane materials have been rapidly developing recently as a promising alternative to conventional organic or inorganic membrane materials [5,6]. More specifically, organic-inorganic hybrid membranes, in which the organic and inorganic components are linked together through strong ionic/covalent bonding, have attracted significant research interest due to better dispersion and stronger bonding of organic and inorganic moieties [1,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…More specifically, organic-inorganic hybrid membranes, in which the organic and inorganic components are linked together through strong ionic/covalent bonding, have attracted significant research interest due to better dispersion and stronger bonding of organic and inorganic moieties [1,5,6,7]. Among various polymers, poly(vinyl alcohol) (PVA) based hybrid organic-inorganic membranes have received significant interest as the inorganic moieties restrict swelling of the PVA but maintain their excellent film forming properties [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on pervaporation separation of aqueous salt solution using hybrid PVA/MA/TEOS membrane

Xie

Hoang

et al. 2014

Separation and Purification Technology

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Heat treatment is believed to be an important step in controlling the morphology and properties of polymer based membranes. In this study, hybrid organic-inorganic membrane based on poly(vinyl alcohol) (PVA), maleic acid (MA) and tetraethyl orthosilicate (TEOS) was synthesised via a sol-gel route. The effects of heating temperature and heating time on pervaporation separation performance of aqueous salt solution were studied in relation to swelling and hydrophilic properties, the free volume, salt transport properties, and water diffusivity of the membrane. The free volume of the hybrid membrane under different heat treatment conditions were well correlated with the pervaporation testing results. With increasing heating temperature or time, the fractional free volume of the hybrid membrane was reduced due to a more compact structure by crosslinking among PVA, MA and TEOS. As a result, the water flux decreased and the salt rejection increased. The salt transport properties followed a similar trend as the water uptake, indicating the hydrated NaCl was solvated by water in the membrane phase.

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Dual‐layer PBI/P84 hollow fibers for pervaporation dehydration of acetone

2011

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in Wiley Online Library (wileyonlinelibrary.com).Acetone dehydration via pervaporation is challenging, because acetone and water have close molecular sizes, and acetone has a much higher vapor pressure than water. Acetone is also a powerful solvent, which dissolves or swells most polymers. We have developed novel polybenzimidazole/BTDA-TDI/MDI (PBI/P84) dual-layer hollow fibers for pervaporation dehydration of acetone for industrial and biofuel separations. Both thermal and chemical crosslinking modifications were applied to the membranes to investigate their effectiveness to overcome acetone-induced swelling. Thermal treatment can effectively enhance separation performance, but performance stability can only be achieved through the crosslinking modification of PBI. Crosslinking by p-xylene dichloride followed by a thermal treatment above 250 C show significant effectiveness to improve and stabilize pervaporation performance. The fractional free volume of the PBI selective layer reduces from 3.27 to 1.98% and 1.33%, respectively, after thermal treatment and a combination of chemical/thermal crosslinking modifications characterized by positron annihilation spectroscopy.The as-spun PBI/P84 dual-layer hollow fiber membrane shows an acetone/water separation factor of only 2.2 and a Figure 2. Sorption results of PBI and P84 dense films after one-week and one-month immersion in acetone and water.Figure 3. FE-SEM images of the cross-section morphology of the original PBI/P84 dual-layer hollow fiber. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.] Figure 7. FE-SEM images of the cross-section morphology of the outer layer outer edge of original and thermaltreated PBI/P84 dual-layer hollow fibers at various temperatures.

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Analysis of annealing effect on pervaporation properties of PVA-GPTMS hybrid membranes through PALS

Cited by 49 publications

References 20 publications

Sol–gel derived poly(vinyl alcohol)/maleic acid/silica hybrid membrane for desalination by pervaporation

Sol–gel derived poly(vinyl alcohol)/maleic acid/silica hybrid membrane for desalination by pervaporation

Effect of heat treatment on pervaporation separation of aqueous salt solution using hybrid PVA/MA/TEOS membrane

Dual‐layer PBI/P84 hollow fibers for pervaporation dehydration of acetone

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