Preparation of chelating resin filled composite membranes and selective adsorption of Cu(II)

Guang-ling, Pei; Cheng, Guoxiang; Du, Qiyun

doi:10.1016/s0376-7388(01)00583-x

Cited by 14 publications

(3 citation statements)

References 14 publications

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“…1). This effect of evaporation time on the water permeation has been observed in numerous studies, including Pei et al,23 who tested polysulfone membranes, Bindal et al,24 for polyetheramide hydrazide polymer with a novel solvent exchange technique, and Jian et al,25 with a poly(phtalazine ether sulfone ketone) membrane. Although the base polymer and the membrane preparation techniques were different, all of them observed a decrease on the water permeation rate with an increase of the solvent evaporation period.…”

Section: Resultsmentioning

confidence: 71%

Effects of preparation conditions on the surface modification and performance of polyethersulfone ultrafiltration membranes

Mosqueda-Jimenez¹,

Narbaitz²,

Matsuura³

2006

J of Applied Polymer Sci

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ABSTRACT:The impact that some membrane preparation steps had on ultrafiltration (UF) membrane characteristics and performance was studied. Polyethersulfone (PES) was employed as base polymer, while N-methyl pyrrolidone (NMP) was used as a solvent, and polyvinylpyrrolidone (PVP) was used as a nonsolvent pore-forming additive. The manufacturing variables studied were solvent evaporation time and membrane surface modification, using a fluorinebased copolymer referred to as surface-modifying macromolecule (SMM). The flat sheet membranes, prepared via phase inversion, were characterized using solute transport data, X-ray photoelectron spectroscopy (XPS), and contact angle measurements. Membrane performance was evaluated via filtration test protocol that included a 6-day filtration of concentrated river water. The flux reduction with time was modeled using single and dual mechanisms of fouling. The pore blockage/cake filtration model described better the behavior of the permeation rate along the experiments. Increasing the solvent evaporation time decreased the size of the pores and the permeation rate. However, it did not significantly affect the removal of the organic compounds naturally present in the river water used as feed. XPS and contact angle measurements proved that the short evaporation periods did not allow enough SMM migration to the surface to provoke a significant effect on the membrane performance.

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Section: Resultsmentioning

confidence: 71%

Effects of preparation conditions on the surface modification and performance of polyethersulfone ultrafiltration membranes

Mosqueda-Jimenez¹,

Narbaitz²,

Matsuura³

2006

J of Applied Polymer Sci

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“…Extensive studies with UF membranes − have shown that the evaporation time, which is the term used by the researchers to describe the period between the time when the film of dope solution is cast on the supporting surface and the time when the film is submerged in a nonsolvent medium (e.g., water) to induce phase inversion, has significant impacts on the properties of corresponding membranes. It was demonstrated that longer evaporation time in the fabrication of UF membranes would generally result in a denser membrane with smaller surface pore size, lower water flux, and slightly higher rejection characteristics. − ,− Nevertheless, although the potentially significant effects of evaporation time have been noted previously, very few works have been done to explore these effects in the development of MD membranes. One example of related research involves the use of surface modifying macromolecules (SMM) to increase the hydrophobicity of poly(ether sulfone) (PES) membranes.…”

Section: Introductionmentioning

confidence: 99%

Effects of Polymer Ratio and Film-Penetration Time on the Properties and Performance of Nanocomposite PVDF Membranes in Membrane Distillation

Baghbanzadeh

Hirceaga

Rana

et al. 2016

Ind. Eng. Chem. Res.

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Nanocomposite membranes were prepared for vacuum membrane distillation (VMD) by casting the dope suspension on top of a nonwoven polyester backing material. The dope consisted of 7.0 wt % hydrophilic SiO 2 nanoparticles and a polyvinylidene fluoride (PVDF) blend of high molecular weight (H) and low molecular weight (L). The effects of the blend ratio (H:L) and the penetration time (τ), defined as the period between the completion of membrane casting and the immersion in the coagulation bath, on the membrane properties and performance were studied. It was found that the VMD flux is governed by the pore size and thickness of the top layer (defined as the layer formed above the backing material), both of which are affected by the H:L ratio and the penetration time. Results indicate that the VMD flux increased as the portion of L in the casting dope increased at constant τ, while a maximum flux was observed at τ = 2 min when the penetration time was changed at constant H:L ratio. It was also observed that the liquid entry pressure of water (LEP w ) of membranes changed with the PVDF blend ratio and penetration time due to alteration of the maximum pore size. Considering all the data collected, the combination of H:L = 2:8 and penetration time of 3 min was identified as the best condition for the preparation of nanocomposite membranes, achieving one of the highest VMD fluxes, 12.1 kg/m 2 h at 27.5 °C and 1.2 kPa, an improved LEP w of 27.0 psig, and a near complete NaCl rejection.

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“…The choice of membrane materials depends on both chemical and physical compatibility of the selective layer with the substrate, which in turn determines the stability and performance of the resulting composite membranes. Several researchers studied different methods for The preparation of composite NF membranes, for example, vapor deposition, plasma initiated polymerization, photo initiated polymerization, the dip coating method, electron beam irradiation, atom transfer radical polymerization, resin-filled chelating, in situ amines cross-linking, and vacuum coating process [2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Polyvinyl Alcohol/Polyvinyl Chloride (Pva/Pvc) Hollow Fiber Composite Nanofiltration Membranes for Water Treatment

Alsalhy¹,

Figoli²,

Algebory³

et al. 2010

IJCPE

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Two different polyvinyl alcohol/polyvinyl chloride (PVA/PVC) hollow fiber composite nanofiltration membranes were prepared after PVC hollow fiber membranes were coated using dip-coating method with PVA aqueous solution, which was composed of PVA, fatty alcohol polyoxyethylene ether (AEO9), and water [PVA/AEO9/water (4:0.5:95.5) wt%]. Effect of two different PVC hollow fiber immersion times in coating solution were studied. Cross-section, internal and external surfaces of the PVC hollow fibers and PVA/PVC composite nanofiltration membranes structures were characterized by scanning electron microscopy (SEM), pure water permeation flux and solutes rejection. It was found that, the coating layer thickness on the outer surface of the 19 wt% PVC hollow fiber was thin and about (6μm), while the coating solution penetrates through the outer edge of the PVC hollow fiber and it looks like sponge-like structure with increase of the dip-coating time from 20 to 30 sec. Besides, the pure water permeation flux decreases and solutes rejection increases with an increase of the coating time from 20 to 30 sec for the two PVA/PVC composite nanofiltration membranes. Molecular weight cut-off (MWCO) of the PVA/PVC composite nanofiltration membranes were in the range of NF (i.e. 200-3000 Mw).

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Preparation of chelating resin filled composite membranes and selective adsorption of Cu(II)

Cited by 14 publications

References 14 publications

Effects of preparation conditions on the surface modification and performance of polyethersulfone ultrafiltration membranes

Effects of preparation conditions on the surface modification and performance of polyethersulfone ultrafiltration membranes

Effects of Polymer Ratio and Film-Penetration Time on the Properties and Performance of Nanocomposite PVDF Membranes in Membrane Distillation

Polyvinyl Alcohol/Polyvinyl Chloride (Pva/Pvc) Hollow Fiber Composite Nanofiltration Membranes for Water Treatment

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