Preparation, characterization and performance of polyethersulfone/organically modified montmorillonite nanocomposite membranes in removal of pesticides

Ghaemi, Negin; Madaeni, S.S.; Alizadeh, Abdolhamid; Rajabi, Hamid; Daraei, Parisa

doi:10.1016/j.memsci.2011.08.004

Cited by 151 publications

(75 citation statements)

References 30 publications

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“…However, the variance test, for a 5% significance level, between these two permeate flows, did not demonstrate that the variances are different. These results were expected because an improvement of pure water flux upon clay nanoparticle addition was also observed in previous studies (Mierzwa et al, 2013;Ma et al, 2012, Ghaemi et al, 2011Monticelli et al, 2007).…”

Section: Membrane Performance Evaluationsupporting

confidence: 86%

“…The contact angle results showed that clay nanoparticles and PVP addition affected membrane hydrophilicity. According to previous studies (Ghaemi et al, 2011;Anadão et al, 2010;Monticelli et al, 2007), it was expected that additives would decrease the contact angle and increase hydrophilicity, but the results have shown the opposite, since the control membrane had the lowest contact angle. Mierzwa et al (2013) and Ma et al (2012) demonstrated that the nanoclay had little effect on the hydrophilicity of membranes.…”

Section: Membrane Hydrophilicitymentioning

confidence: 94%

“…For solutions containing clay nanoparticles (2% and 4% based on PVDF mass) specific amounts of clay were added and dispersed in the previously prepared solutions. The range of clay nanoparticle concentration chosen was based on previous results obtained by Mierzwa et al (2013) and Ghaemi et al (2011). This solution was stirred for 24 hours at 50 ºC for complete clay nanoparticle dispersion.…”

Section: Solution Preparation and Membrane Casting Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Clay nanoparticles effects on performance and morphology of poly(vinylidene fluoride) membranes

Morihama

Mierzwa

2014

Braz. J. Chem. Eng.

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-In this study, a comparison between neat poly(vinylidene fluoride) (PVDF) membrane and composite (PVDF-Nanoclay and PVDF-PVP-Nanoclay) membranes is presented. All membranes were synthesized by the phase inversion process, using 18% PVDF, n-methylpyrrolidone as solvent and water as the non-solvent. Demineralized water cross-flow permeation tests were conducted to evaluate the membranes performance. Scanning electron microscopy (SEM) images of the membranes surface and cross-section and water contact angle measurements were used to estimate additives effects on membranes morphology. The results indicate that dopant addition affected membrane permeate flux and morphology. The 4% nanoclay composite membrane resulted in the highest ultrapure water permeability (0.9130 m 3 .m -2 .h -1 .MPa -1 ), lower hydraulic resistance (3.27×10 +12.m -1 ), lower contact angle (87.1º) and highest surface porosity (0.95%). Furthermore, it was verified that the membrane surface porosity increased with increasing clay nanoparticles concentrations. It was observed that the morphology of the membranes with clay nanoparticle addition is characterized by a thin surface layer, with macro-pores, a thin bottom layer, which has a sponge-like structure with micro-pores and a thick intermediate layer, with finger-like pores and macro-pores. It was also verified that the introduction of PVP promotes a denser morphology compared with membranes without it. Based on the SEM surface and cross-sectional images and permeability tests, it became evident that the internal pore morphology plays an important role in membrane performance, because the higher the frequency and extent of the finger-like pores in the intermediate layer the higher is the membrane permeability. These preliminary results indicated that the use of nanoclay as an additive for membrane casting is a promising procedure for improving membrane performance for water and wastewater treatment.

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Section: Membrane Performance Evaluationsupporting

confidence: 86%

Section: Membrane Hydrophilicitymentioning

confidence: 94%

Section: Solution Preparation and Membrane Casting Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Clay nanoparticles effects on performance and morphology of poly(vinylidene fluoride) membranes

Morihama

Mierzwa

2014

Braz. J. Chem. Eng.

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“…The permeation flux increase of the membrane was attributed to a surface hydrophilicity increase due to the added hydrophilic inorganic nano-sized Al 2 O 3 particles. Ghaemi et al (2011) reported a study of nanocomposite membranes containing polyethersulfone (PES) and organically modified montmorillonite (OMMT). The membranes were prepared by a combination of solution dispersion and wet-phase inversion methods.…”

Section: Phase Inversion Methodsmentioning

confidence: 99%

Organic-inorganic hybrid membranes in separation processes: a 10-year review

Souza

Quadri

2013

Braz. J. Chem. Eng.

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-In relation to some inorganic membranes, polymeric membranes have relatively low separation performance. However, the processing flexibility and low cost of polymers still make them highly attractive for many industrial separation applications. Polymer-inorganic hybrid membranes constitute an emerging research field and have been recently developed to improve the separation properties of polymer membranes because they possess properties of both organic and inorganic membranes such as good hydrophilicity, selectivity, permeability, mechanical strength, and thermal and chemical stability. The structures and processing of polymer-inorganic nanocomposite hybrid membranes, as well as their use in the fields of ultrafiltration, nanofiltration, pervaporation, gas separation and separation mechanism are reviewed.

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“…The addition of nanomaterials functionalized with oxygen groups to the polymer membranes is a strategy to control fouling by modifying their hydrophilicity and also giving the membrane an electric charge [1,6]. The increase of zeta potential of the membrane enhances an electrostatic repulsion between some pollutants and membrane surface thus, that would be retained without approaching neither coating the pore or membrane surfaces [7].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of polyethersulfone nanocomposite membranes for the removal of endocrine disrupting micropollutants from wastewater. Mechanisms and performance

Kamińska

Bohdziewicz

Calvo

et al. 2015

Journal of Membrane Science

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The addition of carbon nanotubes to improves the removal and adsorption of endocrine disrupting micropollutants (bisphenol A and nonylphenol). Increasing the SWCNT (single walled carbon nanotubes) content increases removal and diminishes reversible and irreversible fouling.The isoelectric point of the SWCNT containing membranes decreases when the content of nanotubes increases with more negative charges at alkaline pH. Because, the nanotube loaded membranes are also less hydrophilic and bisphenol and nonylphenol are hydrophobous, adsorption plays a key role in the removal of micropollutants. An increase in the transmembrane applied pressure decreases the removal and more steeply for the membranes containing more SWCNT.Higher porosities, leading to higher water permeabilities, are also obtained for more loaded membranes. Too high SWCNT contents lead to a saturation and decrease of removal probably because high porosities lead to a decrease in adsorption due to both a decrease in the available surface and a sweeping action of convection through the membrane.

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Preparation, characterization and performance of polyethersulfone/organically modified montmorillonite nanocomposite membranes in removal of pesticides

Cited by 151 publications

References 30 publications

Clay nanoparticles effects on performance and morphology of poly(vinylidene fluoride) membranes

Clay nanoparticles effects on performance and morphology of poly(vinylidene fluoride) membranes

Organic-inorganic hybrid membranes in separation processes: a 10-year review

Fabrication and characterization of polyethersulfone nanocomposite membranes for the removal of endocrine disrupting micropollutants from wastewater. Mechanisms and performance

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