Diffusion and sorption studies of dyes through PVA cryogel membranes

Papancea, Adina; Valente, Artur J.M.; Paţachia, Silvia

doi:10.1002/app.30983

Cited by 25 publications

(18 citation statements)

References 80 publications

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“…However, polymer/AC composites with macroporous matrices produced by cryogelation have not been practically studied using dye adsorption [107]. Papancea et al [190] studied sorption and diffusion of three dyes: Congo red, methylthymol blue (MTB), and crystal violet (CV) through PVA membrane. After sorption, the dye-release kinetics (desorption) from the PVA membrane was monitored to evaluate regeneration of the membrane.…”

Section: Equilibrium and Kinetic Adsorptionmentioning

confidence: 99%

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Cryogels: Morphological, structural and adsorption characterisation

Gun'ko

Savina

Mikhalovsky

2013

Advances in Colloid and Interface Science

281

205

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*Graphical Abstract (for review)Cryotripic gelation technique allows the synthesis of solid and soft macroporous gels Textural characterisation of cryogel in native superhydrated state with noninvasive methods Adsorption and diffusion characteristics of macroporous cryogels with respect to macromolecules and cells Theoretical modelling of adsorption from aqueous media *Highlights (for review) Please find the revised manuscript entitled "Cryogels: morphological, structural and adsorption characterisation" by Vladimir M. Gun'ko, Irina N. Savina, Sergey V. Mikhalovsky to re-consider for publication in the "Advances in Colloid and Interface Science"The paper was completely edited and changed according to reviewers comments.Sincerely yours, Prof. V. M. Gun'koCover Letter ABSTRACTExperimental results on polymer, protein, and composite cryogels and data treatment methods used for morphological, textural, structural, adsorption and diffusion characterisation of the materials are analysed and compared. Treatment of microscopic images with specific software gives quantitative structural information on both native cryogels and freeze-dried materials that is useful to analyse the drying effects on their structure. A combination of cryoporometry, relaxometry, thermoporometry, small angle X-ray scattering (SAXS), equilibrium and kinetic adsorption of low and high-molecular weight compounds, diffusion breakthrough of macromolecules within macroporous cryogel membranes, studying interactions of cells with cryogels provides a consistent and comprehensive picture of textural, structural and adsorption properties of a variety of cryogels. This analysis allows us to establish certain regularities in the cryogel properties related to narrow (diameter 0.4 < d < 2 nm), middle (2 < d < 50 nm) and broad (50 < d < 100 nm) nanopores, micropores (100 nm < d < 100 m) and macropores (d > 100 m) with boundary sizes within modified life science pore classification. Particular attention is paid to water bound in cryogels in native superhydrated or freeze-dried states. At least, five states of water -free unbound, weakly bound (changes in the Gibbs free energy G < 0.5-0.8 kJ/mol) and strongly bound (G > 0.8 kJ/mol), and weakly associated (chemical shift of the proton resonance  H = 1-2 ppm) and strongly associated ( H = 3-6 ppm) waters can be distinguished in hydrated cryogels using 1 H NMR, DSC, TSDC, TG and other methods. Different software for image treatment or developed to analyse the data obtained with the adsorption, diffusion, SAXS, cryoporometry and thermoporometry methods and based on regularisation algorithms is analysed and used for the quantitative morphological, structural and adsorption characterisation of individual and composite cryogels, including polymers filled with solid nano-or microparticles.

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Section: Equilibrium and Kinetic Adsorptionmentioning

confidence: 99%

“…The diffusion experiments revealed that CR and MTB do not permeate the PVA membrane making it a promising candidate in the advanced purification of wastewaters. The effect of the incorporation of dyes on chemical properties of PVA cryogels was studied using DSC, SEM, and FTIR spectroscopy [190].…”

Section: Equilibrium and Kinetic Adsorptionmentioning

confidence: 99%

Cryogels: Morphological, structural and adsorption characterisation

Gun'ko

Savina

Mikhalovsky

2013

Advances in Colloid and Interface Science

281

205

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“…Permeability of heavy metal ion salts through PVA HG membranes was measured using a diffusion cell similar to that reported elsewhere 26, 27. This consists of two 250 mL compartments filled with electrolyte solution (the donor compartment) and water (the receptor compartment).…”

Section: Methodsmentioning

confidence: 99%

PVA cryogel membranes as a promising tool for the retention and separation of metal ions from aqueous solutions

Papancea

Valente

Paţachia

2010

J of Applied Polymer Sci

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ABSTRACT:The sorption and transport of metal ions by poly(vinyl alcohol) hydrogel membranes (PVA HG), obtained by physical crosslinking through the freezing/ thawing method, was analyzed using aqueous nitrate solutions of copper, lead, and nickel, at concentrations ranging from 1 to 100 mM, at 25 C. The sorption of heavy metal by PVA HG has been characterized by swelling and loading degrees. The effect of the heavy metals incorporation on the chemical properties of PVA HG matrices has been studied using SEM, to observe changes in the surface morphology of PVA HG membranes, and FTIR-ATR, aiming to monitor the heavy metals ions sorption into PVA hydrogel membranes. The analysis of permeation and diffusion coefficients of 100 mM aqueous solutions of Cu 2þ , Ni 2þ , and Pb 2þ show that the diffusion process may be mainly described by hydrodynamic models; however, the transport process shows that the distribution coefficient for the different heavy metals are always higher than one, in agreement, with the sorption studies.

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“…According to the analysis, this action was due to the large number of polar groups in GO, which occurred due to the hydrogen bonds in GO, SA, and AKP. [27][28][29] These hydrogen bonds absorbed within a certain wave-number range. 30,31 To explore and regulate the effect of the hydrogen bonds in the SA-AKP composite system after different mass fractions of GO were added, the broad peak at 3000-3700 cm 21 was smoothed, and the peak area ratio (i.e., the ratio of different types of hydrogen bonds) was calculated after we subtracted the straight line and the Gauss peak fitting of the peak analyzer.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Effect of graphene oxide on the molecules of a sodium alginate–krill protein composite system and characterization of the system's composite fiber morphology and mechanical properties

Zhang

Guo

Zhao

et al. 2018

J of Applied Polymer Sci

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Graphene oxide (GO), sodium alginate (SA), and Antarctic krill protein (AKP) were blended to get functional fibers. These GO–SA–AKP composite fibers were obtained by conventional wet spinning with 5% calcium chloride as a coagulation solution. The intermolecular interactions of the GO–SA–AKP composite system were characterized by Fourier transform infrared spectroscopy. The morphology, crystallinity, thermal stability, and mechanical properties of the GO–SA–AKP composites were investigated with scanning electron microscopy, X‐ray diffraction, thermogravimetric analysis, and differential scanning calorimetry. The results show that the number of GO layers decreased gradually during the process of wet spinning. The addition of GO promoted an increase in intramolecular hydrogen bonding and a decrease in intermolecular hydrogen bonding in the composite system. With increasing GO mass fraction, the intermolecular hydrogen‐bond content, crystallinity, breaking strength, and thermal stability in the composite system increased first and then decreased. At the same time, the mass fraction of GO and the draw ratio had significant effects on the surface morphologies of the composite fibers. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46642.

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Diffusion and sorption studies of dyes through PVA cryogel membranes

Cited by 25 publications

References 80 publications

Cryogels: Morphological, structural and adsorption characterisation

Cryogels: Morphological, structural and adsorption characterisation

PVA cryogel membranes as a promising tool for the retention and separation of metal ions from aqueous solutions

Effect of graphene oxide on the molecules of a sodium alginate–krill protein composite system and characterization of the system's composite fiber morphology and mechanical properties

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