Preparation and characterization of porous PVDF hollow fiber membranes for CO2 absorption: Effect of different non-solvent additives in the polymer dope

Mansourizadeh, Amir; Ismail, Ahmad Fauzi

doi:10.1016/j.ijggc.2011.03.009

Cited by 77 publications

(43 citation statements)

References 36 publications

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“…Also, the shift towards the polymernonsolvent was too small (less than 1%), compared to those of the other membranes, to cause a significant change in the physical structure of the membrane. Ismail and Mansourizadeha (2011) investigated the effect of anon-solvent additive on PVDF hollowfibre membranes and concluded that two processes were responsible for the appearance of oval-shaped microvoids and the observed variation in the width of the sub-layer macrovoids: the thermodynamic demixing effect and the kinetic effect of viscosity. The thermodynamic effect is characterised by rapid demixing induced by the presence of a viscous solvent, NMP, and overrides the kinetic effect of viscosity increases via lignin addition.…”

Section: Membrane Morphologymentioning

confidence: 99%

Investigating the Usability of Alkali Lignin as an Additive in Polysulfone Ultrafiltration Membranes

2015

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The effects of natural and synthetic polymer additives on the properties of ultrafiltration membranes were studied. The use of NaOH to remove the residual additive remaining in the membranes during coagulation was also investigated, as was the effect of NaOH post-treatment relative to membrane performance. To evaluate the residual additives present, ATR-FTIR was used. Contact-angle analysis and water-absorption experiments were used to examine the hydrophilic properties of the prepared membranes. Membranes modified with lignin (Lig) were found to absorb more water (94% water uptake) than other membranes. In general, the contact angles were found to be low for membranes treated with NaOH. Membrane permeability was greatest in lignin_polysulfone (Lig_PSf), followed by polyvinylpyrrolidone_polysulfone (PVP_PSf), and with polyethylene glycol_polysulfone (PEG_PSf) the least permeable, similar to the trend observed in water uptake. A 'Robeson plot' analogue showed that Lig_PSf membranes had high separation factors regardless of the size of the solute being rejected. This study indicates the feasibility of using cheap, readily available additives to increase the performance of membranes.

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Section: Membrane Morphologymentioning

confidence: 99%

Investigating the Usability of Alkali Lignin as an Additive in Polysulfone Ultrafiltration Membranes

2015

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“…The additives for polymer membrane preparation can be categorized into different types (Liu et al, 2011b;Mansourizadeh and Ismail, 2011), including macromolecular polymeric additives, micromolecular alcohols or organic acids, inorganic acid or salts, and the strong non-solvent additive, water. Polyvinyl pyrrolidone (PVP) and polyethylene glycol (PEG) are commonly used polymer additives for both hydrophobic and hydrophilic membrane preparation, and they are considered to be strong pore formers.…”

Section: Introductionmentioning

confidence: 99%

“…Thus water soluble organic and inorganic micromolecule additives are more appropriate for hydrophobic membrane preparation from this point of view. Organic alcohols and acids like methanol, ethanol, 1-propanol, glycerol, butanol, diethylene glycol, ethylene glycol, acetic acid, methanoic acid, and ethanedioic acid have been investigated in many cases (Feng et al, 2006;Khayet et al, 2002;Mansourizadeh and Ismail, 2011;Shih et al, 1990;Sukitpaneenit and Chung, 2009;Wang et al, 2000). Lithium halides like LiCl, LiBr, and LiF have been researched widely, as well as other lithium salts such as LiClO 4 and LiNO 3 , due to the formation of acid-base complexes between the LiCl and solvent and the interaction between Li + ions and electron donor groups of PVDF, which may dramatically affect the phase inversion process during coagulation (Idris et al, 2010;Kurdi and Tremblay, 2001;Wang et al, 2000;Yeow et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Lithium halides like LiCl, LiBr, and LiF have been researched widely, as well as other lithium salts such as LiClO 4 and LiNO 3 , due to the formation of acid-base complexes between the LiCl and solvent and the interaction between Li + ions and electron donor groups of PVDF, which may dramatically affect the phase inversion process during coagulation (Idris et al, 2010;Kurdi and Tremblay, 2001;Wang et al, 2000;Yeow et al, 2005). Other metal salts and inorganic acids such as ZnCl 2 , CaCl 2 , AlCl 3 , NaBr, KClO 4 , Mg(ClO 4 ) 2 , NaNO 3 , and H 3 PO 4 have also been evaluated, and due to the strong interaction among additives, solvent, non-solvent, and polymers, these additives have significant effects on the membrane preparation process and the resultant membranes (Kraus et al, 1979;Kurdi and Tremblay, 2001;Mansourizadeh and Ismail, 2011;Noor et al, 2013;Shinde et al, 1999;Yang and Liu, 2003). H 2 O is another commonly used additive with a slight addition in the casting solution.…”

Section: Introductionmentioning

confidence: 99%

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Effect of non-solvent additives on the morphology, pore structure, and direct contact membrane distillation performance of PVDF-CTFE hydrophobic membranes

Zheng

Zhang

et al. 2016

Journal of Environmental Sciences

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Four common types of additives for polymer membrane preparation including organic macromolecule and micromolecule additives, inorganic salts and acids, and the strong non-solvent H 2 O were used to prepare poly (vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) hydrophobic flat-sheet membranes. Membrane properties including morphology, porosity, hydrophobicity, pore size and pore distribution were investigated, and the permeability was evaluated via direct contact membrane distillation (DCMD) of 3.5 g/L NaCl solution in a DCMD configuration. Both inorganic and organic micromolecule additives were found to slightly influence membrane hydrophobicity. Polyethylene glycol (PEG), organic acids, LiCl, MgCl 2 , and LiCl/H 2 O mixtures were proved to be effective additives to PVDF-CTFE membranes due to their pore-controlling effects and the capacity to improve the properties and performance of the resultant membranes. The occurrence of a pre-gelation process showed that when organic and inorganic micromolecules were added to PVDF-CTFE solution, the resultant membranes presented a high interconnectivity structure. The membrane prepared with dibutyl phthalate (DBP) showed a nonporous surface and symmetrical cross-section. When H 2 O and LiCl/H 2 O mixtures were also used as additives, they were beneficial for solid-liquid demixing, especially when LiCl/H 2 O mixed additives were used. The membrane prepared with 5% LiCl + 2% H 2 O achieved a flux of 24.53 kg/(m 2 ·hr) with 99.98% salt rejection. This study is expected to offer a reference not only for PVDF-CTFE membrane preparation but also for other polymer membranes.

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“…PSf has a T g of 195 ˚C and soluble in chloroform, dimethylformamide, N-methyl-2-pyrrolidone (NMP) and dimethylacetamide (DMAC). Preparation of PSf via phase inversion method was done by many researchers [2,6,7]. Hansen has compiled the solubility data of polysulfone with various solvent based on dispersion, polar and hydrogen bonding parameter.…”

Section: Introductionmentioning

confidence: 99%

Effects of Water as Non-Solvent Additive on Performance of Polysulfone Ultrafiltration Membrane

Yunos

Harun

Basri

et al. 2012

AMR

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Abstract. In this work, polysulfone ultrafiltration membranes were prepared via simple phase inversion with distilled water as non-solvent additive. The main reason for the addition of water in polysulfone dope solution preparation was to enhance the membranes structure. In the dope, 15 wt. % of polysulfone was used and water was varied up to 6 wt. %. The effects of water on morphology, porosity and tensile properties were investigated in detail. From the porosity test, results showed that the addition of water has improved membrane porosity up to 53 %. The FESEM images revealed that membrane morphology has also been modified. However, the tensile properties of membrane decreased as water content increased which may be due to the porosity interaction between polysulfone/NMP with water.

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Preparation and characterization of porous PVDF hollow fiber membranes for CO2 absorption: Effect of different non-solvent additives in the polymer dope

Cited by 77 publications

References 36 publications

Investigating the Usability of Alkali Lignin as an Additive in Polysulfone Ultrafiltration Membranes

Investigating the Usability of Alkali Lignin as an Additive in Polysulfone Ultrafiltration Membranes

Effect of non-solvent additives on the morphology, pore structure, and direct contact membrane distillation performance of PVDF-CTFE hydrophobic membranes

Effects of Water as Non-Solvent Additive on Performance of Polysulfone Ultrafiltration Membrane

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