Separation mechanisms of binary dye mixtures using a PVDF ultrafiltration membrane: Donnan effect and intermolecular interaction

Tran, Thi Tuong Van; Kumar, Selvaraj Rajesh; Lue, Shingjiang Jessie

doi:10.1016/j.memsci.2018.12.070

Cited by 126 publications

(27 citation statements)

References 52 publications

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“…In contrary, the MO dye was more rejected as compared with Rh-B molecules. This anionic MO dye was rejected on the PVDF-PAA surface probably due to the Donnan exclusion mechanism [47]. The electrostatic and intermolecular interactions between different charged dyes (cationic or anionic) and negatively charged membrane plays an important role for rejection behavior, as pointed out in Ghaffar et al [33] work.…”

Section: Permeance and Rejection Performance Of Dyes And Fa Solutionsmentioning

confidence: 83%

“…The surface charge was determined on the membranes. The porous PVDF (prepared using similar method) had a negative zeta potential of −17.3 mV in DI water [47]. The PVDF-PAA intermediate layer (with 10:1 mass ratio) showed a zeta potential of −19.4 mV, lower than that of PVDF, due to the protonation of PAA ionomer.…”

Section: Surface Charge and Contact Angle Measurementsmentioning

confidence: 99%

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Grafting Thin Layered Graphene Oxide onto the Surface of Nonwoven/PVDF-PAA Composite Membrane for Efficient Dye and Macromolecule Separations

2020

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This study investigates the permeance and rejection efficiencies of different dyes (Rhodamine B and methyl orange), folic acid and a protein (bovine serum albumin) using graphene oxide composite membrane. The ultrathin separation layer of graphene oxide (thickness of 380 nm) was successfully deposited onto porous polyvinylidene fluoride-polyacrylic acid intermediate layer on nonwoven support layer using vacuum filtration. The graphene oxide addition in the composite membrane caused an increased hydrophilicity and negative surface charge than those of the membrane without graphene oxide. In the filtration process using a graphene oxide composite membrane, the permeance values of pure water, dyes, folic acid and bovine serum albumin molecules were more severely decreased (by two orders of magnitude) than those of the nonwoven/polyvinylidene fluoride-polyacrylic acid composite membrane. However, the rejection efficiency of the graphene oxide composite was significantly improved in cationic Rhodamine B (from 9% to 80.3%) and anionic methyl orange (from 28.3% to 86.6%) feed solutions. The folic acid and bovine serum albumin were nearly completely rejected from solutions using either nonwoven/polyvinylidene fluoride-polyacrylic acid or nonwoven/polyvinylidene fluoride-polyacrylic acid/graphene oxide composite membrane, but the latter possessed anti-fouling property against the protein molecules. The separation mechanism in nonwoven/polyvinylidene fluoride-polyacrylic acid membrane includes the Donnan exclusion effect (for smaller-than-pore-size solutes) and sieving mechanism (for larger solutes). The sieving mechanism governs the filtration behavior in the nonwoven/polyvinylidene fluoride-polyacrylic acid/graphene oxide composite membrane.

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Section: Permeance and Rejection Performance Of Dyes And Fa Solutionsmentioning

confidence: 83%

Section: Surface Charge and Contact Angle Measurementsmentioning

confidence: 99%

Grafting Thin Layered Graphene Oxide onto the Surface of Nonwoven/PVDF-PAA Composite Membrane for Efficient Dye and Macromolecule Separations

2020

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“…In a similar study, Tran et al demonstrated high rejections for anionic dyes, eriochrome black T (EBT, 83.5%), and naphthol blue black (NBB, 89.1%) using PVDF UF membrane. They have explained that both EBT and NBB prevailed in the anion state in aqueous solution, due to strongly acidic sulfonate groups (−SO 3 ) in their molecular structures, causing them to be repulsed away from the negatively charged PVDF membrane (35).…”

Section: Discussionmentioning

confidence: 99%

Azo dye removal via surfactant-assisted polyvinylidene fluoride membrane

Darbandi

Mousavi

Lotfabad

et al. 2021

Environ Health Eng Manag

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Background: Recently, concerns have been raised regarding the environmental and public health safety of azo dyes, the most widely used synthetic dyes. The membrane technique has been introduced as one of the efficient methods for dye removal treatments. Polyvinylidene fluoride (PVDF) membrane manipulated by surfactants was studied for removal of the azo dye, carmoisine. Methods: PVDF membrane was prepared via non-solvent-induced phase separation (NIPS) and used to remove the azo dye, carmoisine. Three nonionic surfactants including Tween 20, Tween 60, and Tween 80 were used individually as additives in casting solutions to improve PVDF membrane properties. Results: Fourier-transform infrared spectroscopy (FTIR) demonstrated the presence of functional groups of carbonyl (C=O) and hydroxyl (OH), assigned to Tween molecules, in the membrane chemical structure. All Tween species caused a decrease in the surface hydrophobicity of PVDF membranes illustrated by the reduced contact angles. Each Tween at a 2% concentration in the dope solution led to an increase in the pore-size of PVDF membranes, which was estimated by scanning electron microscopy (SEM). However, this impact was reversed at Tween concentrations of 4%. Membranes were assessed for dye removal efficiency and permeate flux in a cross-flow system. Permeability of PVDF membranes improved (~78%) with adding Tween 80 at a concentration of 2%. Tween 60 at a 2% concentration resulted in a ~45% increase in dye removal efficiency of PVDF membranes. And, atomic force microscopy (AFM) showed that Tween 60 increased membrane surface roughness. Conclusion: Surfactant-mediated changes in the surface properties of PVDF membrane improved dye removal efficacy.

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“…The Pore size of nanocomposite membrane was reduced due to excellent compatibility of filler content (PANI-TNT) with polyvinylidene difluoride [44]. The average diameter of pores in composite membranes decreases which improve the performance of membranes due to their excellent sieving mechanism [42]. The graphs of pore size distribution are shown in Fig.…”

Section: Surface Morphology Of Synthesised Membranesmentioning

confidence: 98%

“…SEM images of the synthesised membrane represent that the roughness and asymmetry on the membrane's surface enhance with the increase in the concentration of PANI-TNT within nanocomposite membranes. The membrane's surfaces also showed porous structures [42]. When the casting solution is immersed in a coagulation bath, the DMF from the casted membrane was exchanged with water from a coagulation bath.…”

Section: Surface Morphology Of Synthesised Membranesmentioning

confidence: 99%

Photodegradation of textile pollutants by nanocomposite membranes of polyvinylidene fluoride integrated with polyaniline–titanium dioxide nanotubes

Nawaz

Umar

Nawaz

et al. 2021

Chemical Engineering Journal

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In this research article, the PVDF (polyvinylidene fluoride)-PANI (polyaniline)-titanium nanotube (TNT) based nanocomposite membranes were synthesised through phase inversion method. The composition and structural properties of nanocomposite membranes were characterised by X-ray photoelectron spectroscopy (XPS), Fouriertransform infrared spectroscopy (FTIR), X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscope (SEM). The significant properties of synthesised membranes such as distribution of pore size, thermal properties, mechanical properties, and photocatalytic behaviour of membranes were also studied. The hydrophilic properties of the composite membranes increased with filler content (PANI-TNT) and results in improved pure water flux (484.8 ± 2.9 L/m 2 h −1 ) compared to that (312.0 ± 1.91 L/m 2 h −1 ) of the pure PVDF membrane. The pure PVDF and nanocomposite membrane were further analysed in terms of their filtration properties such as adsorption of dyes (methyl orange, Allura red) and UV self-cleaning properties. The newly developed nanocomposite membranes showed excellent pollutant removal efficiency (~90%). The synthesised nanocomposite membranes also showed photocatalytic activities due to the presence of TNTs, and adsorption of methyl orange (MO) reduces significantly with the UV light irradiations. The UV self-cleaning property of the composite membrane was further confirmed due to their high flux recovery ratio of about 94%. The results show that embedded PANI-TNT within nanocomposite was photo-catalytically active and degrade the dye molecules from the surface of the nano composite membrane.

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Separation mechanisms of binary dye mixtures using a PVDF ultrafiltration membrane: Donnan effect and intermolecular interaction

Cited by 126 publications

References 52 publications

Grafting Thin Layered Graphene Oxide onto the Surface of Nonwoven/PVDF-PAA Composite Membrane for Efficient Dye and Macromolecule Separations

Grafting Thin Layered Graphene Oxide onto the Surface of Nonwoven/PVDF-PAA Composite Membrane for Efficient Dye and Macromolecule Separations

Azo dye removal via surfactant-assisted polyvinylidene fluoride membrane

Photodegradation of textile pollutants by nanocomposite membranes of polyvinylidene fluoride integrated with polyaniline–titanium dioxide nanotubes

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