Preparation and characterization of ZnO/polyethersulfone (PES) hybrid membranes

Shen, Liguo; Bian, Xiaokai; Lu, Xin; Liuqing, Shi; Liu, Zhongying; Chen, Lifang; Hou, Zhufeng; Fan, Kai

doi:10.1016/j.desal.2012.02.019

Cited by 192 publications

(98 citation statements)

References 20 publications

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“…Therefore, when the casting solution was immersed in the coagulation bath, longer exchange between solvent and non-solvent led to form larger finger-like pores [45]. Also, these metal nanoparticles had strong interactions with PES/NMP, which was reflected in a significant increase in viscosity (data not shown) and was confirmed by other authors, who worked with incorporating nano-ZnO in PES structures [46,47]. These effects caused a delay in the precipitation of the polymer (a decrease in the diffusion rate of water into the polymer film) and then, the existing macrovoids in the synthesized membranes were partially suppressed due to the delayed liquid-liquid demixing [11,31].…”

Section: Morphological Studysupporting

confidence: 72%

“…Shen et al demonstrated that the presence of ZnO nanoparticles on the PES surface and in its matrix structure generated two effects: an increase in the hydrophilicity and also, an increase in the viscosity, as it was observed during the preparation of the polymer solutions [46]. When the ZnO concentration increased in the membrane (from 0.05 to 0.25 wt% ZnO/PES ratio), contact angle did not change significantly which indicates that the presence of ultra-low concentrations of ZnO can notably improve the hydrophilicity of a membrane, as it has been confirmed in other studies [38,62].…”

Section: Morphological Studymentioning

confidence: 99%

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Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

García-Ivars

Iborra–Clar

Alcaina–Miranda

et al. 2015

Journal of Membrane Science

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ElsevierGarcía Ivars, J.; Iborra Clar, MI.; Alcaina Miranda, MI.; Van Der Bruggen, B. (2015). Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes. ABSTRACTInorganic nanoparticles have been applied as additive in membrane synthesis for improving different properties from the base polymer such as hydrophilicity, fouling resistance or permselectivity. To investigate the changes caused by the presence of the inorganic nanoparticles in the formation of the membrane structure, two different metallic compounds with opposite hydrophilicity were used as additives: hydrophilic zinc oxide (ZnO) and hydrophobic tungsten disulphide (WS 2 ). For this purpose, the effect of these metal nanoparticles at ultra-low concentrations (0.05 and 0.25 wt% metal nanoparticles/polymer ratio) in the preparation of flat-sheet membranes based on polyethersulphone (PES) by immersion-precipitation method was investigated. Nmethyl-2-pyrrolidone (NMP) was used as solvent. The influence of both metal nanoparticles on the characteristics and permselective properties of PES membranes was studied with microscopic observations, contact angle measurements, and filtration experiments. Although the incorporation of metal nanoparticles could turn the system into thermodynamically unstable, the demixing process during formation of membranes was slightly delayed, suppressing the macrovoid formation (remarkably using WS 2 ).Regardless the nature of the metal nanoparticles, results showed an overall improvement in membrane hydrophilicity and permselectivity by adding metal nanoparticles compared to the control PES membrane, demonstrating that the behaviour of both metal nanoparticles at ultra-low concentrations was very similar.

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Section: Morphological Studysupporting

confidence: 72%

Section: Morphological Studymentioning

confidence: 99%

Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

García-Ivars

Iborra–Clar

Alcaina–Miranda

et al. 2015

Journal of Membrane Science

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“…The hydrophilic nature of the PSF-ZnO-EG also enhanced the water permeation rate, wettability of membrane surface, and also improved fouling resistance toward organic matter. The reduction size of functionalized ZnO NPs had higher reacting surface area and well dispersion in the structure [25]. The ZnO-EG NPs decreased agglomerations problem and caused less pores blockage in membrane structure.…”

Section: Membrane Performancementioning

confidence: 99%

Functionalization of zinc oxide (ZnO) nanoparticles and its effects on polysulfone-ZnO membranes

Chung

Ba‐Abbad

Mohammad

et al. 2015

Desalination and Water Treatment

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Incorporation of nanoparticles in membranes has recently been reported to lead to enhancement of the membrane performance for various applications. In this study, ZnO nanoparticles were synthesized via sol-gel method using zinc acetate and oxalic acid as starting materials. However, the influence of additive, in this case ethylene glycol (EG), on the size of ZnO nanoparticles produced was investigated. All diffraction peaks of XRD patterns indicated the wurtzite structure and the hexagonal phase of ZnO nanoparticles. Uniform spherical particle sizes with lower sizes and reduced agglomeration were observed when EG was used under the same experimental conditions. The particle size was found in the range of 20-30 nm when EG was used as compared to those without EG, which was between 50-60 nm. Dispersion property of the ZnO NPs was further verified by zetasizer analysis. Subsequent incorporation of the smaller size ZnO nanoparticles in membranes has shown improvement in the characteristics and performance of the membranes. Membranes incorporated with ZnO showed improved hydrophilicity and enhancement of membrane performance in terms of permeability, porosity, and rejection ability.

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“…Theoretically each polymer can be used as membrane material, but in practice, only a restricted group of polymers have been used of certain chemical and physical properties [6]. Because of its very attractive properties, very often polyethersulfone is used [7]. It shows good thermal stability, high mechanical resistance, chemical neutrality, wide range of tolerated pH, and physiological neutrality [8].…”

Section: Introductionmentioning

confidence: 99%

Metals Ions Removal by Polymer Membranes of Different Porosity

Jasiewicz

Pietrzak

2013

The Scientific World Journal

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The effect of the amount of pore generating agent (polyvinylpyrrolidone) added to standard polymer membranes containing 18 wt.% of polyethersulfone on the physicochemical properties of the membranes and their capacity for removal of iron and copper ions from the liquid phase was studied. The membranes were obtained by the phase inversion method. The results have shown that the modification of polymer membranes by the use of different amounts of the pore forming agent in their syntheses leads to significant changes in porosity and has beneficial effect on equilibrium water content. The membranes studied were found to show different acid-base surface character, but for all membranes studied, a significant dominance of oxygen groups of acidic character was evidenced. The most effective were the membranes of the lowest content of polyvinylpyrrolidone, while the lowest values of resistance showed the membranes of the highest content of PVP, and so the ones of the greatest porosity.

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Preparation and characterization of ZnO/polyethersulfone (PES) hybrid membranes

Cited by 192 publications

References 20 publications

Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

Functionalization of zinc oxide (ZnO) nanoparticles and its effects on polysulfone-ZnO membranes

Metals Ions Removal by Polymer Membranes of Different Porosity

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