Carbon nanotube-nanoporous anodic alumina composite membranes with controllable inner diameters and surface chemistry: Influence on molecular transport and chemical selectivity

Alsawat, Mohammed; Altalhi, Tariq; Kumeria, Tushar; Santos, Abel; Lošić, Dušan

doi:10.1016/j.carbon.2015.05.090

Cited by 33 publications

(32 citation statements)

References 41 publications

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“…The fabrication of CNTs-AAO with controllable diameter and length of CNTs is demonstrated by Alsawat et al [48], which indicated that the dimensional features of CNTs-AAO can be precisely engineered by controlling the anodization time of AAO during electrochemical anodization process and the deposition time of carbon source during CVD process. Similarly, vertically aligned CNTs were implanted in the AAO template through CVD with acetylene and nickel severing as carbon source and catalyst, respectively (as shown in Figure 7).…”

Section: Fabrication Methods Of Cnts-based Composite Membranesmentioning

confidence: 99%

Fabrication and Water Treatment Application of Carbon Nanotubes (CNTs)-Based Composite Membranes: A Review

et al. 2017

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Membrane separation technology is widely explored for various applications, such as water desalination and wastewater treatment, which can alleviate the global issue of fresh water scarcity. Specifically, carbon nanotubes (CNTs)-based composite membranes are increasingly of interest due to the combined merits of CNTs and membrane separation, offering enhanced membrane properties. This article first briefly discusses fabrication and growth mechanisms, characterization and functionalization techniques of CNTs, and then reviews the fabrication methods for CNTs-based composite membranes in detail. The applications of CNTs-based composite membranes in water treatment are comprehensively reviewed, including seawater or brine desalination, oil-water separation, removal of heavy metal ions and emerging pollutants as well as membrane separation coupled with assistant techniques. Furthermore, the future direction and perspective for CNTs-based composite membranes are also briefly outlined.

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Section: Fabrication Methods Of Cnts-based Composite Membranesmentioning

confidence: 99%

Fabrication and Water Treatment Application of Carbon Nanotubes (CNTs)-Based Composite Membranes: A Review

et al. 2017

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“…This approach is adequate for describing track membranes [16] or membranes made of porous anodic aluminum oxide [26,27] with a continuous conductive coating, which is present both on the pore walls and on the outer membrane surface. Ion transport is carried out only through the membrane pores.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

“…The authors first demonstrated an increase in the rejection of monovalent ions at a constant value of liquid permeability by applying a given potential to the membrane. The ionic selectivity of porous anodic aluminum oxide membranes with a conductive carbon coating are being studied at present [25][26][27]. These membranes represent a array of aligned cylindrical nanopores.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Conductive Nanoporous Membranes with Switchable Ionic Selectivity

Ryzhkov

Vyatkin

Mikhlina

2020

Membr. Membr. Technol.

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An interesting area of modern membrane science is the development of "smart" membranes, which can affect the transport properties of selected components via external tuning. When the target components are ions, such a tuning can be realized with the help of electric field created by the conductive pore surface. We have proposed in this work a mathematical model of ions transport in a cylindrical nanopore with the electronic charge at the conductive surface and the chemical charge, which is separated from the surface by the Stern layer. The model is based on one-dimensional equations for potential, ion concentrations, and pressure in the diffuse layer. It is applied for describing the membrane potential at zero current, which characterizes the type and strength of ionic selectivity. It is shown that the change of surface potential in the direction from negative to positive results in the continuous change of pore selectivity from cation to anion. The decrease in the Stern layer capacitance and increase in the pore radius lead to the decrease in ionic selectivity. The presence of positive (negative) chemical charge causes the shift of potential value, at which the selectivity is switched, in the direction of negative (positive) values. At this value of potential, the membrane becomes non-selective, the diffusive flux of ions reaches maximum, and the osmotic flow ceases. The suggested model provides a qualitative and quantitative description of experimental results on switchable selectivity of tracketched membranes modified by the gold coating.

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“…Carbon nanotubes (CNTs) are among the key nanostructures that have been actively developed and investigated during the last two decades due to their unique electrophysical properties, such as high electrical and thermal conductivity, high mechanical strength, relative chemical inertness, the ability to absorb electromagnetic radiation over a wide range of wavelengths, etc. CNTs are considered as promising candidates for many potential applications such as nanocomposite materials, catalyst and catalyst supports, field emitters, sensors, energy storage devices, hydrogen storage, fuel cells, nanoelectronics, bionanomaterials, and nanomedicine . Generally, most of multi‐walled carbon nanotubes (MWCNTs) are used to improve the physical and chemical characteristics of numerous composite materials based on polymeric, metal and oxide matrices .…”

Section: Introductionmentioning

confidence: 99%

Fe–Mo and Co–Mo Catalysts with Varying Composition for Multi‐Walled Carbon Nanotube Growth

Kazakova

Кузнецов

Bokova‐Sirosh

et al. 2017

Physica Status Solidi (b)

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The formation of active component of Fe-Mo and Co-Mo catalysts for carbon nanotube growth with variable Mo content is studied with in situ XRD, XPS, and STEM&EDX. The activation of bimetallic Fe-Mo catalysts under the growth conditions leads to the formation of Fe-Mo alloy particles in contrast to Co-containing catalysts in which active alloy incorporates only a small portion of Mo (<2-3 at.%). The stable carbide formation for these systems is not detected. The effect of Mo content in Fe-Mo and Co-Mo catalysts on the properties of MWCNTs is additionally investigated using the Raman spectroscopy in combination with measurements of the temperature dependence of conductivity. It is shown that MWCNT defectiveness depends on the active component composition for both Fe-Mo and Co-Mo catalysts. The current carrier concentration for the MWCNTs grown on Fe-Mo catalysts slightly increases with the Mo content. The opposite effect is observed for the tubes grown on Co-Mo catalysts, showing a decrease in the current carrier concentration with the increase of Mo concentration.

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Carbon nanotube-nanoporous anodic alumina composite membranes with controllable inner diameters and surface chemistry: Influence on molecular transport and chemical selectivity

Cited by 33 publications

References 41 publications

Fabrication and Water Treatment Application of Carbon Nanotubes (CNTs)-Based Composite Membranes: A Review

Fabrication and Water Treatment Application of Carbon Nanotubes (CNTs)-Based Composite Membranes: A Review

Modelling of Conductive Nanoporous Membranes with Switchable Ionic Selectivity

Fe–Mo and Co–Mo Catalysts with Varying Composition for Multi‐Walled Carbon Nanotube Growth

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