Hierarchical hybrid carbon nano-structures as robust and reusable adsorbents: Kinetic studies with model dye compound

Vijwani, Hema; Nadagouda, Mallikarjuna N.; Namboodiri, Vasudevan; Mukhopadhyay, Sharmila M.

doi:10.1016/j.cej.2015.01.027

Cited by 45 publications

(26 citation statements)

References 52 publications

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“…Here, (NP CNT ) is # of NPs per unit length of CNT, (L CNT ) is the average length of the CNT carpet, and (CNT A ) is the number of CNTs per unit area of the substrate. Previous studies of CNT carpet growth on the same grade of HOPG substrate under identical conditions [28] have reported that the best estimates for (L CNT ) and (CNT A ) using this deposition method are about 20 μm and 280 μm −2 , which match well with direct physical property measurements [6].…”

Section: Influence Of Cnt Functionalization On Agnp Distributionsupporting

confidence: 75%

“…CNTs offer several advantages as NP supports and several earlier studies have discussed the influence of the physical and chemical nature of various support structures on advanced applications [4]. The CNT-enhanced substrates reported by our group have proved to be useful for several applications such as nanocomposite formation [5], surface adsorption [6], cell scaffolding [7], thermal management materials [8] in addition to support for metallic NPs [9][10][11].…”

Section: Q1mentioning

confidence: 99%

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Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

et al. 2016

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The effectiveness of nanoparticle-based functional devices depends strongly on the surface morphology and area of the support. An emerging powerful approach of increasing the available surface area without decreasing strength or increasing bulk is to attach arrays of suitable nanotubes on the surface, and to attach the necessary nanoparticles to them. Earlier publications by this team have shown that carpet-like arrays of carbon nanotubes (CNT) can be successfully grown on a variety of larger carbon substrates such as graphite, foams and fabric, which offer hierarchical multiscale supporting architecture suitable for the attachment of silver nanoparticles (AgNPs). A limiting factor of pure CNT arrays in fluid-based applications is their hydrophobicity, which can reduce the percolation of an aqueous medium through individual nanotubes. Previous studies have demonstrated that the treatment of CNT carpets with dry (oxygen) plasma can induce reversible wettability, and treatment with wet (sol-gel) coating can impart permanent wettability. In this paper, we report the influence of such treatments on the attachment of AgNPs, and their effectiveness in water disinfection treatments. Both types of hydrophilic surface treatments show an increase in silver loading on the CNT carpets. Oxygenplasma treated surfaces (O-CNTs) show fine and densely packed AgNP, whereas silica-coated nanotubes (silica-CNTs) show uneven clusters of AgNPs. However, O-CNT surfaces lose their hydrophilicity during AgNP deposition, whereas silica-CNT surfaces remain hydrophilic. This difference significantly impacts the antibacterial effectiveness of these materials, as tested in simulated water containing Gram negative Escherichia coli (E. coli, JM109). AgNPs on silicacoated CNT substrates showed significantly higher reduction rates of E. coli compared to AgNPs on plasma-treated CNT substrates, despite the finer and better dispersed AgNP distribution in the latter. These results provide important insights into different aspects of surface modification approaches that can control the wettability of CNT carpets, and their applicability in water treatment applications.

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Section: Influence Of Cnt Functionalization On Agnp Distributionsupporting

confidence: 75%

Section: Q1mentioning

confidence: 99%

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

et al. 2016

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“…These assumptions are; all adsorption energy sites are similar, all adsorbed molecules do not contact each other, all molecules are isolated in themselves and it can be mentioned about maximum adsorption capacity because of formation of monolayer. [14] The Langmuir isotherm parameters are given in Table 3 and the isotherm plots are given in Figure 2. The Langmuir isotherm is best fitted to experimental data as shown in Figure. The adsorption capacities depending on temperature change are compared using Q m values.…”

Section: Langmuir Adsorption Isothermmentioning

confidence: 99%

“…[14,19] Different types of kinetic models were developed. In this study, three different kinetic models were used.…”

Section: Adsorption Kinetic Studiesmentioning

confidence: 99%

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Oxalic acid removal from wastewater using multi-walled carbon nanotubes: Kinetic and equilibrium analysis

Özcan¹,

İncı̇

Aşçı

et al. 2016

Journal of Dispersion Science and Technology

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Oxalic acid adsorption from aqueous solution studied in this work. Multi-walled carbon nanotubes (MWCNT) were used as an adsorbent. The investigated adsorption variables are equilibrium time, initial acid concentration, and temperature. The experimental results were presented using equilibrium isotherm and kinetic models. The used equilibrium models are Langmuir, Freundlich, and Temkin adsorption isotherms. And the kinetic models are Elovich, Lagergren pseudo first-order and pseudo second-order kinetic models. The thermodynamics studies were carried out at three different temperatures.These values are 278, 298 and 318 K. Langmuir isotherm was the best fitted equilibrium model for the experimental data. The all applied kinetic models were fitted the data, suitably. Graphical Abstract: Downloaded by [University of Bath] at 01:50 22 June 2016 2

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Water Pollution Remediation Techniques with Special Focus on Adsorption

Mandal

Muralidharan

Mandal

2019

Advanced Research in Nanosciences for Water Technology

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Hierarchical hybrid carbon nano-structures as robust and reusable adsorbents: Kinetic studies with model dye compound

Cited by 45 publications

References 52 publications

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

Oxalic acid removal from wastewater using multi-walled carbon nanotubes: Kinetic and equilibrium analysis

Water Pollution Remediation Techniques with Special Focus on Adsorption

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