Physicochemical effects of hydrolyzed asymmetric polyacrylonitrile membrane microstructure on dehydrating butanol

Lai, Cheng-Lee; Chao, Wei-Chi; Hung, Wei‐Song; An, Quan‐Fu; Guzman, Manuel Reyes De; Hu, Chien‐Chieh; Lee, Kueir‐Rarn

doi:10.1016/j.memsci.2015.05.008

Cited by 44 publications

(12 citation statements)

References 46 publications

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“…At lower ionic strength, it may explain that the Debye length decreases along with the salt concentration increases, thus the ζ-potential which is determined at a fixed distance from the membrane surface, surface of shear, becomes lower . On the contrary, the higher salt concentrations compressed the diffuse electrical double layer on membrane surface at high pH …”

Section: Resultsmentioning

confidence: 99%

“…The 19% PAN membranes (19 wt % PAN membrane have higher permeance than 20% PAN after hydroxylation, Figure S3) were immersed a 2 M aqueous solution of NaOH at 50 °C to modify their surface for different durations (1–4 h). By hydrolysis, parts of the CN groups of PAN were converted to CONH 2 and COOH groups . The resulting hydrolyzed PAN membranes were rinsed with water until the pH of the rinsed water reached about 7.0.…”

Section: Methodsmentioning

confidence: 99%

“…By hydrolysis, parts of the CN groups of PAN were converted to CONH 2 and COOH groups. 29 The resulting hydrolyzed PAN membranes were rinsed with water until the pH of the rinsed water reached about 7.0. Finally, the hydrolyzed PAN membranes were stored in water for further use.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of High-Flux Nanoporous Solvent Resistant Polyacrylonitrile Membrane with Potential Fractionation of Dyes and Na₂SO₄

Lin

Gao

et al. 2017

Ind. Eng. Chem. Res.

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In this study, a high-flux organic solvent nanofiltration (OSN) membrane with the permeance of 66.7 Lm −2 h −1 bar −1 in methanol and 38.0 Lm −2 h −1 bar −1 in ethanol was successfully prepared from nanoporous PAN by phase inversion and hydrolyzation in sodium hydroxide solution. The polymer concentration and hydrolysis time were varied to control the final morphology and performance. The ternary phase diagram and viscosity measurements were used to describe precipitation thermodynamics and kinetics of the phase inversion process. The prepared membranes had a typical asymmetric structure, which could be observed from images of the cross section, comprising a dense skin layer and a porous substructure in the sublayer. It was found that the polymer concentration has an apparent influence on the morphology, selectivity and permeability of the prepared membranes. FTIR analysis, ζ-potential and water contact angle measurements confirm a molecular chain rearrangement as hydrogen bonds were formed between CONH 2 and COOH groups during the carboxyl modification process. Moreover, an increase of the surface hydrophilicity was obtained by hydrolysis. A good solvent resistance and a satisfactory separation performance in the nanofiltration range were achieved with hydrolyzed PAN membranes in polar as well as nonpolar solvents. The relationship between solvent permeation and combined solvent properties (viscosity, molar diameter and solubility parameter) indicated a strong interaction of selected solvents with polymers except alkanes. The hydrolyzed PAN membrane was applied to fractionation of dyes and Na 2 SO 4 solution compared to commercial NF membrane. The high dye rejection and salt permeance remained constant with the salt addition for high flux hydrolyzed PAN showing the fractionation potential for dyes and divalent salts, and establishing the strong advantage over commercial NF membranes.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Preparation of High-Flux Nanoporous Solvent Resistant Polyacrylonitrile Membrane with Potential Fractionation of Dyes and Na₂SO₄

Lin

Gao

et al. 2017

Ind. Eng. Chem. Res.

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“…On the other hand, there are no discernable pores in the SEM image for the surface of the PAN-A substrate. All of these observations indicate that the PAN polymer network was shrunk, owing to the stress relaxation of PAN polymer in the water bath at an elevated temperature of 45 °C [ 44 ]; the swelling of the PAN polymer network resulting from the alkaline treatment further reduced the pore size [ 45 , 46 ], which is probably due to the synergic effect of the alkaline treatment and the elevated temperature. The enlarged SEM images of the original PAN substrate and the PAN substrates with the heat treatment and alkaline treatment are exhibited in Figure S1 .…”

Section: Resultsmentioning

confidence: 99%

Effects of the Substrate on Interfacial Polymerization: Tuning the Hydrophobicity via Polyelectrolyte Deposition

Liu

et al. 2020

Membranes

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Interfacial polymerization (IP) has been the key method for the fabrication of the thin film composite (TFC) membranes that are extensively employed in reverse osmosis (RO) and forward osmosis (FO). However, the role of the substrate surface hydrophilicity in the formation of the IP-film remains a controversial issue to be further addressed. This study characterized the IP films formed on a series of polyacrylonitrile (PAN) substrates whose hydrophilicities (from ~38 to ~93 degrees) were varied via different approaches, including the alkaline treatment and the deposition of various polycations. It was revealed that delamination could occur when the IP film was formed on a relatively hydrophilic surface; the integrity of the TFC membranes was substantially improved, owing to the modification of the polyelectrolyte deposition. On the other hand, the characterization indicated that the TFC membrane could have an enhanced efficiency (with a factor of ~2) when the substrate was relatively hydrophilic. It was established that the polyelectrolyte deposition could be exploited to effectively tune the substrate surface hydrophobicity, thereby providing more degrees of freedom for the optimization of the TFC membranes fabrication.

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“…In addition to these factors, the use of various types of organic or inorganic additives also significantly affects the properties of the obtained membranes [19]. In order to increase the hydrophilic properties and to reduce fouling, polyacrylonitrile can be chemically modified relatively easily, for example, by primary amines, by sodium hydroxide treatment, or by physical surface treatment using plasma [13,20]. An interesting solution seems to be to enrich polyacrylonitrile with conductive polymer in order to evacuate charges accumulated on the membrane and reduce fouling.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Composite PAN/PANI Membranes

Fryczkowska

Piprek

Sieradzka

et al. 2017

International Journal of Polymer Science

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The methods of modifying PAN membranes have been known and used for many years. An interesting solution seems to be to give the sensory properties to this type of membranes. This paper presents the results of research on the method of obtaining PAN/PANI membranes using phase inversion method from a solution in DMF, following two methods: (1) dissolving both polymers (PAN and PANI) and then coagulating in water or in an aqueous solution of CSA and (2) forming the membranes from polyacrylonitrile solution and coagulation in water, followed by coating of CSA with a solution of TFE. The membranes obtained as a result of the experiment were tested for physical and chemical properties, transport properties, surface morphology, degree of dispersion of composite components, and sensitivity to the presence of dilute acids and bases. FTIR microspectroscopy and scanning electron microscopy were used to study the surface morphology. The sensory properties of membranes that are inherently colored were determined visually and by UV-Vis spectrophotometry. Furthermore, when choosing the method of membrane forming, we can obtain membranes with good physical and chemical and transport properties or ones characterized by high sensitivity to the pH of the solution.

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Physicochemical effects of hydrolyzed asymmetric polyacrylonitrile membrane microstructure on dehydrating butanol

Cited by 44 publications

References 46 publications

Preparation of High-Flux Nanoporous Solvent Resistant Polyacrylonitrile Membrane with Potential Fractionation of Dyes and Na₂SO₄

Preparation of High-Flux Nanoporous Solvent Resistant Polyacrylonitrile Membrane with Potential Fractionation of Dyes and Na₂SO₄

Effects of the Substrate on Interfacial Polymerization: Tuning the Hydrophobicity via Polyelectrolyte Deposition

Preparation and Properties of Composite PAN/PANI Membranes

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Physicochemical effects of hydrolyzed asymmetric polyacrylonitrile membrane microstructure on dehydrating butanol

Cited by 44 publications

References 46 publications

Preparation of High-Flux Nanoporous Solvent Resistant Polyacrylonitrile Membrane with Potential Fractionation of Dyes and Na2SO4

Preparation of High-Flux Nanoporous Solvent Resistant Polyacrylonitrile Membrane with Potential Fractionation of Dyes and Na2SO4

Effects of the Substrate on Interfacial Polymerization: Tuning the Hydrophobicity via Polyelectrolyte Deposition

Preparation and Properties of Composite PAN/PANI Membranes

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Product

Resources

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Preparation of High-Flux Nanoporous Solvent Resistant Polyacrylonitrile Membrane with Potential Fractionation of Dyes and Na₂SO₄

Preparation of High-Flux Nanoporous Solvent Resistant Polyacrylonitrile Membrane with Potential Fractionation of Dyes and Na₂SO₄