Separation characteristics of acetic acid–water mixtures by pervaporation using poly(vinyl alcohol) membranes modified with malic acid

Işıklan, Nuran; Şanlı, Oya

doi:10.1016/j.cep.2005.01.005

Cited by 89 publications

(47 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With increasing membrane thickness, the resistance across membrane increases, therefore the water flux decreases. According to the solution-diffusion model, at steady state, diffusion flow is constant and there is an inverse relationship between the flux and membrane thickness [13,23,25]. Figure 12 shows a linear relationship between the water flux and the reciprocal of the membrane thickness, as predicted by the Fick's law from the solution-diffusion model (Eqution 5).…”

Section: Pervaporation Testingmentioning

confidence: 96%

“…Figure 12 shows a linear relationship between the water flux and the reciprocal of the membrane thickness, as predicted by the Fick's law from the solution-diffusion model (Eqution 5). Işιklan and Şanlι also reported that the permeation rate was proportional to the reciprocal of membrane thickness on the pervaporation performance of acetic acid-water mixtures through malic acid modified PVA membranes [13]. Therefore, for this system diffusion through the membrane is rate limiting.…”

Section: Pervaporation Testingmentioning

confidence: 99%

“…However, PVA has poor stability in water. Therefore, it must be insolubilised by modification reactions such as grafting [11] or crosslinking [12,13] to form a stable membrane with good mechanical properties and selective permeability to water. 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].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

133

View full text Add to dashboard Cite

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.

show abstract

Section: Pervaporation Testingmentioning

confidence: 96%

Section: Pervaporation Testingmentioning

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

133

View full text Add to dashboard Cite

show abstract

“…However, PVA is a highly hydrophilic polymer and has poor stability in water; thus, its solubility must be prevented for use in aqueous systems. To overcome this problem, PVA should be insolubilized by blending [18], copolymerization [19], grafting [20,21], and cross-linking [22,23]. Recently our laboratory developed modified IPN-based carbohydrate polymers for CR systems of various types of drugs [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of pH sensitive poly(vinyl alcohol)/sodium carboxymethyl cellulose IPN microspheres for in vitro release studies of an anti-cancer drug

et al. 2011

View full text Add to dashboard Cite

Interpenetrating polymeric network microspheres (IPNMs) consisting of poly(vinyl alcohol) and sodium carboxymethylcellulose were prepared by water-inoil emulsion method and were cross-linked with glutaraldehyde. 5-Fluorouracil (5-FU), an anti-cancer drug, was loaded into IPNMs via in situ method. These IPNMs have been characterized by Fourier transform infrared spectroscopy, which confirms the cross-linking of IPNMs through glutaraldehyde. Differential scanning calorimetry and X-ray diffraction analysis of the drug-loaded IPNMs have confirmed uniform molecular dispersion of 5-FU in the IPNMs. Particle size measured using optical microscopy gave an average size of 80-250 lm. Scanning electron microscopy also confirmed the formation of microspheres with smooth surface and spherical shape. Encapsulation efficiency of 5-FU in these IPNMs was achieved up to 62%. Drug release profiles of the IPNMs at different pH conditions (pH 1.2 and 7.4) confirmed that microspheres formed are pH sensitive, resulting controlled release of drug during in vitro dissolution experiments. It has been analyzed with an empirical equation to understand the diffusion nature of drug through the IPNMs. Both encapsulation efficiency and release patterns are found to depend on the nature of the cross-linking agent as well as amount of drug loading. In vitro release studies indicated the release of 5-FU for more than 10 h.

show abstract

“…However, PVA is a highly hydrophilic polymer and has poor stability in water, thus its solubility must be prevented for use in aqueous systems. To overcome this problem, PVA should be insolubilize by blending (Feng and Huang 1996); copolymerization (Lee et al 1995); grafting (Huang and Yeom 1991;Isiklan and Sanli 2004), and cross-linking (Isiklan and Sanli 2005;Sanli et al 2007).…”

Section: Introductionmentioning

confidence: 97%

Interpenetrating polymer network microspheres of hydroxy propyl methyl cellulose/poly (vinyl alcohol) for control release of ciprofloxacin hydrochloride

et al. 2010

View full text Add to dashboard Cite

Hydroxypropylmethylcellulose and Poly (vinyl alcohol) blend microspheres were prepared by water in oil emulsion method and Ciprofloxacin Hydrochloride (CFHcl) was loaded into the interpenetrating polymer network (IPN) microspheres that are crosslinked with glutaraldehyde (GA). Blend microspheres were characterized using Fourier transform infrared Spectroscopy (FT-IR), Scanning electron microscopy, X-ray diffraction and Differential scanning Calorimetry. FTIR spectra results confirmed crosslinking reaction between -OH groups of Poly (vinyl alcohol) and -CHO groups of glutaraldehyde. Scanning electron micrograph showed the formation of plain, uniform and smooth microspheres. X-ray diffraction and thermal studies of plain and drug loaded microspheres indicates that the drug is dispersed at the molecular level in the IPN matrix. In vitro dissolution experiments were performed in pH 7.4 buffer medium at 35°C which indicates a sustained and controlled release of ciprofloxacin hydrochloride (CFHcl) from the IPN microspheres up to 10 h.

show abstract

Separation characteristics of acetic acid–water mixtures by pervaporation using poly(vinyl alcohol) membranes modified with malic acid

Cited by 89 publications

References 29 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

Preparation and characterization of pH sensitive poly(vinyl alcohol)/sodium carboxymethyl cellulose IPN microspheres for in vitro release studies of an anti-cancer drug

Interpenetrating polymer network microspheres of hydroxy propyl methyl cellulose/poly (vinyl alcohol) for control release of ciprofloxacin hydrochloride

Contact Info

Product

Resources

About