Structure, morphology and separation efficiency of hybrid Alg/Fe 3 O 4 membranes in pervaporative dehydration of ethanol

Dudek, Gabriela; Krasowska, Monika; Turczyn, Roman; Gnus, Małgorzata; Strzelewicz, Anna

doi:10.1016/j.seppur.2017.03.043

Cited by 31 publications

(23 citation statements)

References 40 publications

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“…In addition, the degree of self-similarity ∆α (homogeneity, the arrangement of morphological elements) has the same value for all membranes. In previous work [7], we have suggested that the arrangement of morphological elements may affect the transport properties. Here, however, the degree of self-similarity has the same value for all the investigated membranes, and thus cannot be used to explain their different transport properties.…”

Section: Structure Analysismentioning

confidence: 95%

Characterization of the Structure and Transport Properties of Alginate/Chitosan Microparticle Membranes Utilized in the Pervaporative Dehydration of Ethanol

et al. 2020

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The structure and transport properties of alginate/chitosan microparticle membranes used in ethanol dehydration processes were investigated. The membranes were characterized based on images obtained from high-resolution microscopy. The following parameters were determined: the observed total amount of void space, the average size of the void domains, their length and diameter, the fractal dimension, and the generalized stochastic fractal parameters. The total amount of void space was determined to be between 54% and 64%. The average size of the void domains is smaller for alginate membranes containing neat (CS) and phosphorylated (CS-P) chitosan particles when compared to those membranes filled with glycidol-modified (CS-G) and glutaraldehyde crosslinked (CS-GA) chitosan particles. Furthermore, the transport of ethanol and water particles through the studied membranes was modelled using a random walk framework. It was observed that the results from the theoretical and experimental studies are directly correlated. The smallest values of water to ethanol diffusion coefficient ratios (i.e., 14) were obtained for Alg (sodium alginate) membranes loaded with the CS and CS-P particles, respectively. Significantly larger values (27 and 19) were noted for membranes filled with CS-G and CS-GA particles, respectively. The simulation results show that the size of channels which develop in the alginate matrix is less suited for ethanol molecules compared to water molecules because of their larger size. Such a situation facilitates the separation of water from ethanol. The comparison of the structural analysis of the membranes and random walk simulations allows one to understand the factors that influence the transport phenomena, in the studied membranes, and comment on the effect of the length, diameter, number of channels, and variations in the pore diameters on these transport parameters.Polymers 2020, 12, 411 2 of 17 Current research in the pervaporation field is focused on the development of new membrane materials and optimization of the pervaporation process parameters. To advance in both areas, it is necessary to characterize the membrane structure and understand the mass transport processes that are involved in the pervaporation process. One of the methods to study the structure and morphology of the membranes is the fractal analysis. Using the fractal dimension D F and the generalized fractal dimension Dq, it is possible to quantify the structure and morphology of self-similar objects. In our previous work [7], we have shown that there is a strong relationship between the degree of multifractality ∆D and the separation efficiency. Comparing the trends in the changes of the Pervaporation Separation Index (PSI) and the corresponding ∆D values, we have noted, that the maximum PSI was always reached for the lowest values of ∆D. The lower value of ∆D is related to a more homogeneous and self-similar membrane structure. In order to predict the membrane's performance and to design membranes for specific applications, a funda...

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Section: Structure Analysismentioning

confidence: 95%

Characterization of the Structure and Transport Properties of Alginate/Chitosan Microparticle Membranes Utilized in the Pervaporative Dehydration of Ethanol

et al. 2020

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“…Dehydration of organic solvents, particularly the ones having an azeotrope with water, is the most important application of pervaporation . Dehydration of isopropanol has received great attention because of its various applications especially at pharmaceutical laboratories.…”

Section: Introductionmentioning

confidence: 99%

“…Polymeric membranes have received great attention thanks to their wide range of good properties such as acceptable costs, easy fabrication, and scale up . Because of favorable water solubility and diffusivity in hydrophilic matrix, hydrophilic membranes are mainly used for pervaporation dehydration of organic solvent …”

Section: Introductionmentioning

confidence: 99%

“…3 Dehydration of organic solvents, particularly the ones having an azeotrope with water, is the most important application of pervaporation. 4,5 Dehydration of isopropanol has received great attention because of its various applications especially at pharmaceutical laboratories. Because isopropanol (IPA) and water form an azeotrope at around 12 wt% water, isopropanol dehydration through conventional distillation or solvent extraction is uneconomical.…”

Section: Introductionmentioning

confidence: 99%

“…9 Because of favorable water solubility and diffusivity in hydrophilic matrix, hydrophilic membranes are mainly used for pervaporation dehydration of organic solvent. 5 So far, different types of polymers have been used as membrane materials for the PV dehydration of organic solvents. These membranes have mostly included chitosan, [10][11][12] poly (vinyl alcohol), 10,[12][13][14] and sodium alginate.…”

Section: Introductionmentioning

confidence: 99%

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Poly (caprolactone)/poly (ethylene glycol) pervaporation blend membranes: Synthesis, characterization, and performance

Afsar

Saljoughi

Mousavi

2018

Polymers for Advanced Techs

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Poly (caprolactone) membranes with addition of different poly (ethylene glycol) concentrations were prepared for separation of water/isopropanol azeotropic mixture by pervaporation process. Different characterization tests including Fourier transform infrared, scanning electron microscopy, water contact angle, and thermogravimetric analysis were carried out on the prepared membranes. In addition, the effect of poly (ethylene glycol) PEG content on the swelling degree and the performance of the prepared membranes in pervaporation process were investigated. According to the obtained results, all the membranes were water selective and the blend membrane containing 3 wt% PEG exhibited the best pervaporation performance with a water flux of 0.517 kg/m2 hour and separation factor of 1642 at the ambient temperature. Hydrophilicity improvement of the blend membranes was confirmed by constant decrease in water contact angle of the membranes as PEG content increased in the casting solution. Scanning electron microscopy cross‐sectional images indicated that the blend membranes containing PEG had a closed cellular structure. Furthermore, mechanical and thermal properties of the membranes decreased by adding PEG.

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Recent advances in sodium alginate‐based membranes for dehydration of aqueous ethanol through pervaporation

Ehsan

Razzaq

Razzaque

et al. 2022

Journal of Polymer Science

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Sodium alginate (SA) is a progressive material for membrane fabrication. The technological development of SA-based membranes has made a significant contribution to the separation techniques, especially in aqueous organic solutions. The outstanding performance of SA is attributed to its outstanding structural flexibility and hydrophilicity. In view of structural characteristics, SA membranes have immense utilization in the pervaporation separation of organics. Among various organics, dehydration of aqueous ethanol is employed as a standard to check the success of pervaporation (PV) membrane. Because ethanol and water have comparable molecular sizes, thus difficult to extract water from aqueous ethanol mixtures than it is for other organics. A literature survey shows that wide-ranging data are available on the PV performance of SA and its modified membranes. In this context, the present review addresses the recent advances made in SA membranes for enhanced ethanol dehydration performance during the last decade.Available data since 2010 has been compiled for grafted, crosslinked, blend, mixed matrix, and composite hybrid sodium alginate membranes in terms of separation factor, permeation flux, and pervaporation separation index PSI. The data are assessed with reference to the effect of feed composition, membrane selectivity, flux, and swelling behavior.

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Structure, morphology and separation efficiency of hybrid Alg/Fe 3 O 4 membranes in pervaporative dehydration of ethanol

Cited by 31 publications

References 40 publications

Characterization of the Structure and Transport Properties of Alginate/Chitosan Microparticle Membranes Utilized in the Pervaporative Dehydration of Ethanol

Characterization of the Structure and Transport Properties of Alginate/Chitosan Microparticle Membranes Utilized in the Pervaporative Dehydration of Ethanol

Poly (caprolactone)/poly (ethylene glycol) pervaporation blend membranes: Synthesis, characterization, and performance

Recent advances in sodium alginate‐based membranes for dehydration of aqueous ethanol through pervaporation

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