Novel nanocomposite pervaporation membranes composed of poly(vinyl alcohol) and chitosan-wrapped carbon nanotube

Peng, Feifei; Pan, Fusheng; Sun, Honglei; Lu, Lianyu; Jiang, Zhongyi

doi:10.1016/j.memsci.2007.06.008

Cited by 193 publications

(87 citation statements)

References 21 publications

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“…124 This property coupled with their high specic surface area with low density, exceptional mechanical properties, nanoscale dimensions and highly precise diameters, high thermal stability, very low frictional coefficients on their internal surface, high strength-to weight ratio, formation of highly porous structures, and chemical stability makes CNTs a promising candidate for complementing or substituting conventional NPs in the fabrication of new generation nanocomposite membranes. [125][126][127][128][129][130][131][132][133][134][135][136][137][138] The excellent mechanical properties of CNTs arise from the presence of C-C bonds in the graphite layer, which are most probably the strongest chemical bonds known in nature. CNTs can be synthesized either as a series of shells of different diameters spaced around a common axis, called multi-walled carbon nanotubes, MWCNTs (consisting of up to 10-100 carbon shells), or as singular tubes, called single-walled carbon nanotubes (SWCNTs).…”

Section: Embedding Cntsmentioning

confidence: 99%

Recent advances in hydrophilic modification and performance of polyethersulfone (PES) membrane via additive blending

2018

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The blending of additives in the polyethersulfone (PES) matrix is an important approach in the membrane industry to reduce membrane hydrophobicity and improve the performance (flux, solute rejection, and reduction of fouling). Several (hydrophilic) modifications of the PES membrane have been developed.Given the importance of the hydrophilic modification methods for PES membranes and their applications, we decided to dedicate this review solely to this topic. The types of additives embedded into the PES matrix can be divided into two main categories: (i) polymers and (ii) inorganic nanoparticles (NPs). The introduced polymers include polyvinylpyrrolidone, chitosan, polyamide, polyethylene oxide, and polyethylene glycol. The introduced nanoparticles discussed include titanium, iron, aluminum, silver, zirconium, silica, magnesium based NPs, carbon, and halloysite nanotubes. In addition, the applications of hydrophilic PES membranes are also reviewed. Reviewing the research progress in the hydrophilic modification of PES membranes is necessary and imperative to provide more insights for their future development and perhaps to open the door to extend their applications to other more challenging areas. IntroductionPolyethersulfone (PES) is a recognized polymeric material, which is widely employed in the fabrication of membranes for various applications. Due to its high glass transition temperature (225 C), and amorphous and transparent properties, PES possesses a high mechanical and hydrolytic stability, thermal and chemical resistance, and outstanding oxidative characteristics, 1 making it ideal for the preparation of asymmetric membranes with different surfaces and pore sizes. 1-3Asymmetric PES membranes are generally prepared via a phaseseparation method. The nal membrane properties and performance are inuenced by the composition (additives, View Article OnlineView Journal | View Issue concentration, and solvent), temperature of the doping solution, the non-solvent or the mixture of non-solvents, and the coagulation bath or the environment. 4 The risk of the fouling effect due to the high hydrophobicity of PES, especially in protein-contacting applications and aqueous ltrations, limits their wide applications.2,3 Numerous research studies have reported efforts to enhance the hydrophilicity of the PES membrane surface. 1,5Basically, the water contact angle (WCA) formed between the membrane-liquid boundary and liquid-gas tangent is generally employed to evaluate the hydrophilic properties of the membrane.6 Commercial PES membranes are hydrophobic in nature with high mechanical, chemical, and thermal stability. 7Usually, these membranes possesses high WCA values and are prone to solute adsorption from various feed streams. It has been well documented that membranes with hydrophilic surfaces are less prone to the fouling effect with microorganisms and organic substances due to: (i) a decreased interaction between the membrane surface and foulant, and (ii) no interaction of hydrogen bonds in the boundary layer betw...

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Section: Embedding Cntsmentioning

confidence: 99%

Recent advances in hydrophilic modification and performance of polyethersulfone (PES) membrane via additive blending

2018

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“…Sometimes, their pores are polluted with chemicals which diminish their performance. Membranes based on CNTs with a unique structure have overcome this problem (Brady-Estévez et al 2008;Miller et al 2001;Peng et al 2007;Srivastava et al 2004;Thomas and McGaughey 2008;Whitby et al 2008). In the following, the historical perspective, and then the properties and applications of CNTs in the different gas separation fields will be introduced.…”

Section: Separation Of Gaseous Mixtures Using Carbonbased Nanomateriamentioning

confidence: 99%

Review on carbon nanotubes and carbon nanotube bundles for gas/ion separation and water purification studied by molecular dynamics simulation

Fatemi

Foroutan

2015

Int. J. Environ. Sci. Technol.

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Water and air pollutants have huge impacts on the entire living system. In addition, the newly emerging nanopollutants, increasing global warming, and consequent climate changes are posing major threats to the freshwater or fresh air availability. This has made it urgent to invent an appropriate water/air treatment technology that removes nanopollutants and also desalinates water to a significant extent. Carbon-based nanomaterials have generated marvelous interest in a wide range of research activities due to their high adsorption capacities. Carbon nanotubes, carbon nanotube bundles, and related materials have potential applications in gas/ion separation and water purification. Recently, gas/ion separation and water purification through carbon-based nanomaterials have received increasing attention. This review summarizes the properties of carbon nanotubes and carbon nanotube bundles related to gas separation, ion separation, and water purification using molecular dynamics simulations. Membranes-based carbon nanomaterials show promise of water purification and gas separation. These attractive properties of carbon nanotubes-based and carbon nanotube bundles-based nanomaterials make them proper candidates for gas separation, gas molecular-sieving processes, and desalination purposes in nanoscale dimensions.

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“…Afterward, a certain amount of CNTs (3 mg in ml) was added to the solution which then was stirred, and subsequently sonicated in ultrasonic bath for 2 hr. A stable black suspension was obtained which indicates formation of a nondestroyable surface decoration/wrapping of CNTs with biopolymers [36,37].…”

Section: Decoration Of Cntsmentioning

confidence: 99%

Wrapping carbon nanotubes by biopolymer chains: Role of nanointerfaces in detection of vapors in conductive polymer composite transducers

2015

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Chitosan (CS) and hydrophobic-modified chitosan (HM-CS) chains were wrapped onto multiwalled carbon nanotubes (MWNTs) and introduced to polyvinyl alcohol (PVA) matrices as nanohybrid conductive polymer composites (CPCs) for detection of polar vapors. The effect of grafted alkyl groups on polarity of CS chains were studied by quantum mechanics (QM). The designed composites were applied as sensitive layers to clarify the response mechanism in CPCs gas sensors. It was realized that the wrapped biopolymers intensely influenced the sensitivity of the composites. Experiment results specified that the nature of biomacromolecules and their interactions with vapor molecules affects the resistance change in CPCs. The higher interaction of CS with polar vapor molecules caused more plasticization of polymer segments in the MWNTs connections. Such phenomenon enhanced the resistance change in the presence of analytes. Moreover, it was inferred that the semiconductor character of MWNTs has an important effect in the final signals. The more polar structure of CS in comparison with HM-CS enhanced the adsorption of vapor molecules on the surface of MWNTs, and the electron donor analytes decreased the conductivity of p-type MWNTs increasing the final responses. The presented results corroborate that the performance of CPCs gas sensors could be finely tuned through manipulation of the nanointerfaces. POLYM. COMPOS., 00:000-000, 2015.

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Novel nanocomposite pervaporation membranes composed of poly(vinyl alcohol) and chitosan-wrapped carbon nanotube

Cited by 193 publications

References 21 publications

Recent advances in hydrophilic modification and performance of polyethersulfone (PES) membrane via additive blending

Recent advances in hydrophilic modification and performance of polyethersulfone (PES) membrane via additive blending

Review on carbon nanotubes and carbon nanotube bundles for gas/ion separation and water purification studied by molecular dynamics simulation

Wrapping carbon nanotubes by biopolymer chains: Role of nanointerfaces in detection of vapors in conductive polymer composite transducers

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