Synthesis of magnetite in poly(vinyl alcohol) matrix and its use in separation of acetone/water mixtures via pervaporation, vapor permeation with and without temperature difference methods

Olukman, Merve; Şanlı, Oya; Solak, Ebru Kondolot

doi:10.1016/j.vacuum.2015.06.014

Cited by 15 publications

(6 citation statements)

References 49 publications

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“…In the presence of the OH groups of KOH and various polar functionalities of the copolymer black color Fe 3 O 4 nanoparticles is formed for 1:1 molar ratio of Fe(III)/Fe(II) while 2:1 molar ratio results in the formation of brown color γ‐Fe 2 O 3 [ 28,29 ] as shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…In fact, in in-situ method, the generation of low and high concentration (0%-60%) of FeNPs within the copolymer matrix is possible after the percolation threshold. [30] In the presence of the OH groups of KOH and various polar functionalities of the copolymer black color Fe 3 O 4 nanoparticles is formed for 1:1 molar ratio of Fe(III)/Fe(II) while 2:1 molar ratio results in the formation of brown color γ-Fe 2 O 3 [28,29] as shown in Figure 1.…”

Section: Synthesis Of the Composite Hydrogelmentioning

confidence: 96%

“…FeNPs and KC-filled copolymer gels (noted as NPCPK) were prepared by co-precipitation of hydrated ferrous and ferric salts followed by alkali treatment. [28,29] Accordingly, FeSO 4 Á7H 2 O and FeCl 3 Á6H 2 O were first mixed in water in 1:2 molar ratios. [29] The resulting iron hydroxide precipitate was removed by filtration with a Whatman-41 filter paper.…”

Section: Synthesis Of the Adsorbent Hydrogelmentioning

confidence: 99%

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Adsorption and photocatalytic degradation of tetracycline from water by kappa‐carrageenan and iron oxide nanoparticle‐filled poly (acrylonitrile‐co‐N‐vinyl pyrrolidone) composite gel

Bhangi

Ray

2022

Polymer Engineering & Sci

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Iron oxide nanoparticles (FeNPs) based magnetic hydrogels were prepared by in-situ co-precipitation of ferric/ferrous salts during copolymerization of acrylonitrile (AN) and N-vinyl-2-pyrrolidone (NVP) at different molar ratios by emulsion polymerization in the presence of different wt% of kappacarrageenan (KC) and N, N 0 -methylenebisacrylamide (MBA)crosslinker. The hydrogels were characterized by FTIR, proton and13C-NMR, XPS, XRD, DTA-TGA, DLS, VSM, UV-Visible spectroscopy, TEM, EDX, PZC, compressive strength and contact angle measurement. The network parameters of the gel networks were determined from equilibrium swelling using Flory and Rehner model. The nanocomposite gels were used for batch and column adsorption of tetracycline (TC) from water. After repeated adsorptions, the TC-loaded gels were further used for their photocatalytic degradation for safe removal. The NPs-loaded nanocomposite prepared with 5:1 AN:NVP molar ratio, 1 wt% initiator, 1 wt% MBA and 2 wt% KC showed a rejection of 90.2% and an equilibrium adsorption capacity of 38.9 mg/g for continuous adsorption of 50 mg/L TCs in water in a fixed bed of height 25 mm for an inflow rate of 20 ml/min and the same TC-loaded composite showed a photo-degradation efficiency of 86.1% in 2 h.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis Of the Composite Hydrogelmentioning

confidence: 96%

Section: Synthesis Of the Adsorbent Hydrogelmentioning

confidence: 99%

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Adsorption and photocatalytic degradation of tetracycline from water by kappa‐carrageenan and iron oxide nanoparticle‐filled poly (acrylonitrile‐co‐N‐vinyl pyrrolidone) composite gel

Bhangi

Ray

2022

Polymer Engineering & Sci

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“…Over the past decades, several researches have been conducted using different kinds of hydrophilic polymers, particularly poly(vinyl alcohol) (PVA), poly(acrylic acid) (PAA) and some polysaccharides including cellulose, hydroxyl ethyl cellulose (HEC), chitosan (CS), and sodium alginate as membranes for PV dehydration of IPA/water mixtures . Within them, PVA is considered as the most important material applied in PV separation of organic‐water compounds due to its high hydrophilicity, excellent film‐forming ability along with high thermal, chemical, and mechanical stability . However, flux of PVA membranes in PV dehydration of organics is not satisfactory owing to the glassy and semi‐crystalline character of PVA .…”

Section: Introductionmentioning

confidence: 99%

“…1,2,[7][8][9][10][11][12] Within them, PVA is considered as the most important material applied in PV separation of organic-water compounds due to its high hydrophilicity, excellent film-forming ability along with high thermal, chemical, and mechanical stability. 13,14 However, flux of PVA membranes in PV dehydration of organics is not satisfactory owing to the glassy and semi-crystalline character of PVA. 15,16 Besides, hydrophilic nature of PVA limits its applications under high feed water contents, leading to increased solubility and diffusivity of organic components and subsequently decreased selectivity toward water.…”

Section: Introductionmentioning

confidence: 99%

Modified poly(vinyl alcohol)/chitosan blended membranes for isopropanol dehydration via pervaporation: Synthesis optimization and modeling by response surface methodology

Ghobadi

Mohammadi

Kasiri

et al. 2016

J of Applied Polymer Sci

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Box–Behnken (BB) design of response surface methodology (RSM) was effectively applied to optimize fabrication conditions of modified poly(vinyl alcohol) (PVA) and chitosan (CS) blended pervaporation (PV) membranes. The PVA/CS membranes were crosslinked either by chemical reaction with glutaraldehyde (GA) or by heat‐treating at different temperatures. The main objectives were to determine the optimal levels of fabricating parameters and also to investigate interactions among the variables. CS content in the blended membranes, concentration of crosslinking agent and heat‐treating temperature were the fabrication parameters, the main effects and interaction effects of which on membrane structure and PV performance toward isopropanol (IPA)/water dehydration were investigated, and for which regression models were established. The modified PVA/CS blended membranes were characterized by means of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) as well as X‐ray diffraction (XRD). It was found that the CS content is the most significant factor influencing flux and separation factor among the three studied variables and the experimental results are in excellent accordance with predicted values from the developed RSM regression models. The RSM results indicated that under preparation conditions of 80 wt % CS in the blended membrane, 0.58 wt % GA concentration, and 77 °C heat‐treating temperature, the maximum separation factor of 5222.8 and the normalized flux of 9.407 kg µm/m2h can be acquired with feed content of 85 wt % IPA at 25 °C, showing that the prepared membrane is highly efficient for PV dehydration of IPA. The models were satisfactorily validated against experimental data. Furthermore, the optimum membrane presents excellent separation performance at different feed compositions and temperatures. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44587.

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Pervaporation

Pangarkar

Ray²

2020

Kirk-Othmer Encyclopedia of Chemical Technology

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Pervaporation is a process that employs dense membrane to separates liquid mixtures. Various types of membranes: polymeric, ceramic, or composite can be used. In recent years there has been significant academic as well as industrial advancement in this attractive membrane process. Novel types of membranes have been reported. These include nanocomposite including nano‐sized metal, metal oxide, and graphene/graphene oxide incorporated ceramic/polymer membranes, polyamine‐based thin film composite membranes (earlier commercialized for reverse osmosis membranes), copolymer/interpenetrating network types membranes, template type membranes, polyelectrolyte complex, gold and silver nanoparticle‐based membranes for plasmon PV, and so on. In the application area, besides the well‐known alcohol dehydration PV has been investigated for recovery of aroma and flavor in the food and beverage industries, desulfurization of gasoline, intensification of chemical reactions, and so on. Further, PV is being extensively used as a low‐temperature environment friendly “green technology” for safe removal of volatile organic compounds using highly selective organophilic membranes. The advent of metal–organic framework membranes has resulted in significantly higher selectivities as compared to conventional membranes. PV is also being investigated for desalination with hydrophilic membranes. This article provides a state of the art discussion on PV that includes basic principles, types of membranes/modules, and important industrial applications.

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Synthesis of magnetite in poly(vinyl alcohol) matrix and its use in separation of acetone/water mixtures via pervaporation, vapor permeation with and without temperature difference methods

Cited by 15 publications

References 49 publications

Adsorption and photocatalytic degradation of tetracycline from water by kappa‐carrageenan and iron oxide nanoparticle‐filled poly (acrylonitrile‐co‐N‐vinyl pyrrolidone) composite gel

Adsorption and photocatalytic degradation of tetracycline from water by kappa‐carrageenan and iron oxide nanoparticle‐filled poly (acrylonitrile‐co‐N‐vinyl pyrrolidone) composite gel

Modified poly(vinyl alcohol)/chitosan blended membranes for isopropanol dehydration via pervaporation: Synthesis optimization and modeling by response surface methodology

Pervaporation

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