PVA composite catalytic membranes for hyacinth flavour synthesis in a pervaporation membrane reactor

Ceia, Tiago F.; Silva, A. G.; Ribeiro, C. S. da C.; Pinto, Joana; Casimiro, Maria Helena; Ramos, A.M.; Vital, J.

doi:10.1016/j.cattod.2014.02.052

Cited by 32 publications

(15 citation statements)

References 27 publications

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“…FTIR‐ATR spectra for the pure components reveal characteristic absorption bands pertaining to PVA and GA, which correspond to spectra as presented in the literature. Characteristic peaks for PVA can be found at wavenumbers 3323 cm −1 (OH stretching band), 2936 cm −1 (CH stretch vibration band) and 1429 cm −1 (CH 2 deformation band), together with an acetal bridge peak for COC at 1150–1085 cm −1 …”

Section: Resultssupporting

confidence: 88%

Immobilization of bacteriocin nisin into a poly(vinyl alcohol) polymer matrix crosslinked with nontoxic dicarboxylic acid

Hrabalíková

Holčapková

Šuly

et al. 2016

J of Applied Polymer Sci

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This work is focused on novel methodology of poly(vinyl alcohol) crosslinking by non-toxic dicarboxylic acid, glutaric acid. The cross-linked system was used as a matrix for immobilization of bacteriocin nisin. Effect of the crosslinking degree on physico-chemical, morphology, mechanical, and thermal properties of poly(vinyl alcohol) films were investigated by using swelling test, Fourier transform infrared spectroscopy, scanning electron microscopy, stress-strain analysis, differential scanning calorimetry, and thermogravimetry. Release profile of the nisin from the cross-linked poly(vinyl alcohol) was studied by high performance liquid chromatography. Antibacterial activity of the prepared systems was tested by agar diffusion test and dilution and spread plate technique. Results showed suitability of glutaric acid as effective crosslinking agent of poly(vinyl alcohol) that acts synergistically with bacteriocin nisin against the tested Gram-positive and Gram-negative bacterial strains. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43674.

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Section: Resultssupporting

confidence: 88%

Immobilization of bacteriocin nisin into a poly(vinyl alcohol) polymer matrix crosslinked with nontoxic dicarboxylic acid

Hrabalíková

Holčapková

Šuly

et al. 2016

J of Applied Polymer Sci

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“…The absence of negative values for the activation energy data reveals that the permeation of the species presented in these MMMs is less governed by the adsorption [44]; indeed, polymer cross-linking strongly tends to affect the membrane adsorption, e.g. in PVA [46]. Moreover, the diffusion of a binary liquid mixture is typically characterized by self-and cross (coupled) -plasticization of a permeant.…”

Section: Effect Of Go Loading and Temperature On Pv Performancementioning

confidence: 96%

Towards the dehydration of ethanol using pervaporation cross-linked poly(vinyl alcohol)/graphene oxide membranes

Castro-Muñoz

Buera-González

Iglesia

et al. 2019

Journal of Membrane Science

184

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Highly hydrophilic inorganic material graphene oxide (GO) was successfully prepared and incorporated into a cross-linked poly(vinyl alcohol) (PVA) matrix. The obtained mixed matrix membranes (MMMs) have been used for the dehydration of ethanol (10:90% water-ethanol) by pervaporation (PV), monitoring their performance in terms of total permeate flux, partial components fluxes, as well as their separation factor. The effect of filler was analyzed by doubling the GO content (at 0.5, 1.0, and 2.0 wt.%) in the MMMs.A complete analysis of the operating temperature (between 40-70 ºC) was carried out by means of Arrhenius relationship. Moreover, the membranes were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), measurements of degree of swelling (uptake), water contact angle (CA) and mechanical properties. At 40 ºC, the best performance was provided by the MMMs containing 1 wt.% GO, showing a separation factor of 263 and a permeate flux of about 0.137 kg•m -2 •h -1 (in which 0.133 kg•m -2 •h -1 corresponds to water). This represents a 75 % enhancement of the original permeation rate of pristine cross-linked PVA membranes. Taking into account the promising results, it is likely that these MMMs will provide featured benefits in green processes, e.g. ethanol purification by means of less-energy consumption.

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“…[1][2][3][4]. These membranes have a highly hydrophilic nature, which is considered as an advantage for some applications, but in most cases it becomes a hindrance due to the high swelling capacity of the membranes in water.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of PVA/SiO2 and PVA/SiO2/glutaraldehyde (GA) nanocomposite membranes prepared by single-step solution casting method

et al. 2015

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We prepared poly(vinyl alcohol) (PVA)/SiO 2 and PVA/SiO 2 /glutaraldehyde (GA) nanocomposite membranes in a single step using the solution casting method. The structure, morphology, and properties of these nanocomposite membranes were characterized by Raman spectroscopy, atomic force microscopy, small-and wideangle X-ray scattering, thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis (DMA). The influence of silica and GA loading on the meso-scale characteristics of the composite membranes was investigated. The results showed that silica deposited in the form of small nanoparticles (*1 nm) in the PVA/ SiO 2 membranes, while bigger submicron particles ([25 nm) were formed in the PVA/SiO 2 /GA membranes. The water uptake of the PVA/SiO 2 membranes increased with temperature, but the PVA/SiO 2 /GA membranes were completely dissolved above 50°C. We can therefore conclude that the addition of GA deteriorated the properties of PVA/SiO 2 membranes. The thermal stability of the PVA/ SiO 2 membranes increased with the increasing silica loading with a maximum char yield of 46 % for PVA/SiO 2 / 4T. Even DMA profiles indicated a promising increase in E R (rubbery modulus) from 6 MPa (PVA membrane) to 1015 MPa (PVA/SiO 2 /4T) at 250°C, showing high mechanical strength of these membranes.

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PVA composite catalytic membranes for hyacinth flavour synthesis in a pervaporation membrane reactor

Cited by 32 publications

References 27 publications

Immobilization of bacteriocin nisin into a poly(vinyl alcohol) polymer matrix crosslinked with nontoxic dicarboxylic acid

Immobilization of bacteriocin nisin into a poly(vinyl alcohol) polymer matrix crosslinked with nontoxic dicarboxylic acid

Towards the dehydration of ethanol using pervaporation cross-linked poly(vinyl alcohol)/graphene oxide membranes

Comparative study of PVA/SiO2 and PVA/SiO2/glutaraldehyde (GA) nanocomposite membranes prepared by single-step solution casting method

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