Sorption and permeation of binary water-alcohol systems through PVA membranes crosslinked with multifunctional crosslinking agents

Burshe, M. C.; Sawant, S.B.; Joshi, Jyeshtharaj B.; Pangarkar, Vishwas G.

doi:10.1016/s1383-5866(97)00042-7

Cited by 98 publications

(52 citation statements)

References 8 publications

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“…It was also noted there was a slight shift in the peak a: with MA b: without MA position of hybrid PVA/silica and PVA/MA/silica sample. As explained by Kulkarni et al [2] and Burshe et al [21], this implies silanol groups of TEOS crosslink with the reactive -OH groups of PVA in a crystalline domain, leading to a more compact structure in the amorphous region due to the expansion of the crystal lattice. This is supported by the higher d-spacing value of the crystalline peak of the hybrid membrane which increased from 4.462 (PVA membrane) to 4.560 (PVA/MA/silica membrane).…”

Section: Morphologymentioning

confidence: 88%

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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Section: Morphologymentioning

confidence: 88%

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

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“…As citric acid is known for crosslinking reactions with polyhydroxy compounds like polyvinylalcohols, an interaction between the excess deflocculant molecules and the Optapix PA 4 G binder is assumed. [31] Consequently, this crosslinking process of the PVA binder increasing its molecular weight and ability to interact with a larger number of alumina particles results in the observed increase in yield stress and high-shear viscosity for the slurries with 1.1 wt% Dolapix CE 64.…”

Section: à2mentioning

confidence: 99%

Impact of Slurry Composition on Properties of Cellular Alumina: A Computed Tomographic Study

et al. 2017

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Fine-pored, 45 ppi (pores per linear inch) alumina foams are prepared from ceramic slurries with varying contents of additives (deflocculant, binder) and solid loading following a standardized procedure. Rheological key parameters (yield stress, high-shear viscosity) of the respective slurries are determined by approximation of the experimental flow curves with appropriate rheological models. The resulting ceramic foams are characterized by computed tomography (CT) followed by a morphometric analysis of the reconstruction volume data. The main scope of the work involves the development of a procedure to reliably define the binarization threshold during these morphometric calculations, which is based on the analysis of the differential course of the total porosity results from calculations performed at varying binarization threshold values ("differential thresholding"). A very good match of the CT porosity results with experimental data is achieved, despite the unfavorable CT voxel resolution to foam structure fineness relation. The CT evaluation results are finally correlated to the rheological properties of the respective slurries used in foam manufacturing. The dominant slurry composition parameters are the weight fraction of the ceramic powder and the binder concentration. Increasing binder and solid content result in an increased yield stress and viscosity of the respective dispersion and consequently in a decreased porosity and cell size of the finally manufactured cellular ceramic.

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“…In addition, the mobility of the polymer chains also increased with the feed temperature, which led to the increase of the free volume of the membranes. According to the free volume theory [17], the thermal motion of polymer chains in the amorphous region creates momentary free volumes. As the temperature increases, the frequency and amplitude of the chain motion increase and the resulting free volumes become larger.…”

Section: Effect Of Permeate Pressurementioning

confidence: 99%

Separation of aqueous salt solution by pervaporation through hybrid organic–inorganic membrane: Effect of operating conditions

et al. 2011

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Hybrid polymer-inorganic membranes were prepared by crosslinking poly(vinyl alcohol) (PVA), maleic acid (MA) and silica via an aqueous sol-gel route. Membrane characterisation results revealed silica nanoparticles (<10 nm) were well dispersed in the polymer matrix and significantly reduced swelling of the membrane. The membranes were tested for pervaporation separation of aqueous salt solution with NaCl concentrations of 0.2-5.0 wt% at temperatures 20-65°C, feed flowrates 30-150 mL/min and permeate pressures 2-40 Torr. The salt rejection remained high (up to 99.9%) under all operating conditions. A high water flux of 11.7 kg/m 2 ·hr could be achieved at a feed temperature of 65°C and a vacuum of 6 Torr. The effect of operating conditions on water flux is discussed in relation to diffusion coefficients of water and fundamental transport mechanism through the membrane. The activation energy for water permeation was found to vary from 23.8 to 20.1 kJ/kmol when the salt concentration in the feed was increased from 0.2 to 5.0 wt%.

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Sorption and permeation of binary water-alcohol systems through PVA membranes crosslinked with multifunctional crosslinking agents

Cited by 98 publications

References 8 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

Impact of Slurry Composition on Properties of Cellular Alumina: A Computed Tomographic Study

Separation of aqueous salt solution by pervaporation through hybrid organic–inorganic membrane: Effect of operating conditions

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