Studies on the porosity control of MWCNT/polysulfone composite membrane and its effect on metal removal

Shah, Prachi; Murthy, C. N.

doi:10.1016/j.memsci.2013.02.042

Cited by 161 publications

(73 citation statements)

References 42 publications

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“…The largest visible pore size of the unblended polysulfone membrane (Fig. 17 a) at lower magnification, while in the blended membrane containing 1 % nanotubes, is less than 1 mm [83]. The increased amount is also reflected by the membrane pore form, size and contact angle measurements.…”

Section: Multi-walled Carbon Nanotube/polysulfone Composite Membranesmentioning

confidence: 89%

“…The increase in carbon nanotube makes the surface of the membrane more smooth (Fig. 17 b and 17 c) as the exchange process becomes slower, owing to the increase in the viscosity of the blended solution [83]. The largest visible pore size of the unblended polysulfone membrane (Fig.…”

Section: Multi-walled Carbon Nanotube/polysulfone Composite Membranesmentioning

confidence: 99%

“…The addition of MWNTs can help to reduce the pore size, due to nano size (110-117 nm) diameters of MWNTs, as shown in Fig. 17 [83]. The functionalization of the surface of nanotubes elucidates the required physical bonds between the polysulfone and the incorporated nanotube, which can influence the formation of the porous structure.…”

Section: Multi-walled Carbon Nanotube/polysulfone Composite Membranesmentioning

confidence: 99%

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Morphology Control of Polysulfone Membranes in Filtration Processes: a Critical Review

et al. 2015

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Polysulfone (PSU) membranes have been widely applied in microfiltration and ultrafiltration processes due to their excellent properties, such as chemical inertness across the entire pH range, compressive strength, and thermal stability. Despite these advantages, the application of PSU membranes in filtration processes has often been restricted due to their hydrophobic nature, which results in serious membrane fouling and a reduced permeate flux. Moreover, PSU membranes suffer from several disadvantages, including bulky structure, low binding force between fibers, and poor mechanical properties. The key factor in the development and application of polymeric membranes is the control of its polymeric morphology due to the significant influence of membrane morphology on the membrane performance. Effective techniques of controlling PSU membrane morphology are accessed, and the effects of the morphological control on mechanical properties, chemical stability, membrane performance, and membrane fouling are investigated. Findings from various individual studies were analyzed and discussed in order to provide a critical review of this subject. The results emphasized that the membrane pore size and surface porosity mostly governs PSU membrane morphology, which enhances membrane performance and reduces membrane fouling.

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Section: Multi-walled Carbon Nanotube/polysulfone Composite Membranesmentioning

confidence: 89%

Section: Multi-walled Carbon Nanotube/polysulfone Composite Membranesmentioning

confidence: 99%

Section: Multi-walled Carbon Nanotube/polysulfone Composite Membranesmentioning

confidence: 99%

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Morphology Control of Polysulfone Membranes in Filtration Processes: a Critical Review

et al. 2015

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“…35 In brief, the washed and cleaned CNTs were treated with a 3:1 mixture of concentrated nitric and sulfuric acid (40 mL) for 24 h. These oxidized nanotubes were repeatedly washed with distilled water and then dried under vacuum. Both the single-walled and the multi-walled nanotubes were evaluated for the degree of functionalization in terms of the concentration of the -COOH groups generated on the surface.…”

Section: Purification and Functionalization Of Nanotubesmentioning

confidence: 99%

“…34 Comparing PS and polyethersulfone (PES), it is expected that the compatibility of CNTs and PS will be better than that between CNTs and PES due to the structural differences between PS and PES. We had previously reported the control of porosity by the blending of functionalized MWCNTs with PS to get composite membranes 35 and with SWCNTs to get composite membranes 36 with enhanced removal capacity for various ions separately. A better understanding of the surface structure in terms of pore sizes and pore distribution is still lacking.…”

Section: Introductionmentioning

confidence: 99%

Polysulfone‐based composite membranes with functionalized carbon nanotubes show controlled porosity and enhanced electrical conductivity

Mangukiya

Prajapati

Kumar

et al. 2016

J of Applied Polymer Sci

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Composite membranes of functionalized (-COOH, -CONH 2 , -N 3 ) carbon nanotubes/polysulfone (CNT/PS) synthesized by the phase-inversion method show unique properties with respect to surface characteristics and the selective separation of metal ions from aqueous solution. Apart from the reduction in the pore size depending on the type of functionalities on the nanotubes, the pure water permeation could reach up to as high as 600 L m 22 h 21 (LMH) at reduced pressures and could be due to the functionalized tips of the nanotubes on the membrane surface resulting from the phase inversion process used for the membrane fabrication. The membranes were characterized by small angle neutron scattering (SANS) to confirm the uniform distribution of the nanopores and the surface morphology of the membranes. Results show that rejection of Cu(II) was better than Pb(II) depending on the surface functionality. Interestingly, these membranes also showed enhanced conductivities in the range of 1.0 3 10 22 S cm 21 , the conductivity depending on the type of functionality on the nanotubes, thus confirming the presence of functionalized nanotubes tips on the membrane surface.

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Nanotubes

Vengatesan¹,

Varghese²,

Mittal³

2017

Kirk-Othmer Encyclopedia of Chemical Technology

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Nanotubes are one‐dimensional tubular nanomaterial having a great length to diameter ratio. The substantial research interest of nanotubes for miscellaneous applications is triggered from their unusual and superlative properties. This article narrates the different types of nanotubes and their synthesis and applications. The techniques used to modify various nanotubes properties and thus its performances for various applications are also discussed. Nanotubes have been incorporated with a number of inorganic and organic materials and then used in diverse applications such as sensors, biomedical, energy storage, environmental, and engineering. The presence of tubular structure, large aspect ratio and surface area, porous nature, chemical inertness, and enhanced mechanical and thermal properties are the highlights of nanotubes for vast acceptance in broad range of applications.

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Studies on the porosity control of MWCNT/polysulfone composite membrane and its effect on metal removal

Cited by 161 publications

References 42 publications

Morphology Control of Polysulfone Membranes in Filtration Processes: a Critical Review

Morphology Control of Polysulfone Membranes in Filtration Processes: a Critical Review

Polysulfone‐based composite membranes with functionalized carbon nanotubes show controlled porosity and enhanced electrical conductivity

Nanotubes

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