Silica coating of vapor grown carbon fibers

Jafry, Huma R.; Whitsitt, Elizabeth A.; Barron, Andrew R.

doi:10.1007/s10853-007-1596-8

Cited by 11 publications

(14 citation statements)

References 19 publications

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“…Uptake was 1.6 mg/g consistent with the previous results on non-supported acid treated MWCNTs 25 . We propose that the lower levels of oxygen functionality observed with acid treatment 26 versus epoxidation 15 accounts for the exceptional improvement in metal uptake for the SENTs. Catalytic de-oxygenation of SENTs using ReMeO 3 /PPh 3 14 , 15 indicates 48–63 CNT carbon atoms (C CNT ) per oxygen depending on the sample.…”

Section: Discussionmentioning

confidence: 91%

Easily Regenerated Readily Deployable Absorbent for Heavy Metal Removal from Contaminated Water

Alagappan

Heimann

Morrow

et al. 2017

Sci Rep

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Although clean and abundant water is the keystone of thriving communities, increasing demand and volatile climate patterns are depleting rivers and aquifers. Moreover, the quality of such water sources is threatened by noxious contaminants, of which heavy metals represents an area of growing concern. Recently, graphene oxide (GO) has been suggested as an adsorbent; however, a support is desirable to ensure a high surface area and an immobile phase. Herein, we described the preparation and characterization of a supported-epoxidized carbon nanotube (SENT) via the growth of multi walled carbon nanotubes (MWNTs) onto a quartz substrate. Subsequent epoxidation provides sufficient functionality to enable adsorbent of heavy metals (Cd2+, Co2+, Cu2+, Hg2+, Ni2+, and Pb2+) from aqueous solution with initial concentrations (60–6000 ppm) chosen to simulate high industrial wastewater contamination. The SENT adsorption efficiency is >99.4% for all metals and the saturation concentration is significantly greater than observed for either GO or acid treated MWNTs. The SENT adsorbent may be readily regenerated under mild conditions using a globally available household chemical, vinegar. 1 g of SENT has the potential to treat 83,000 L of contaminated water down to WHO limits which would be sufficient for 11,000 people.

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Section: Discussionmentioning

confidence: 91%

Easily Regenerated Readily Deployable Absorbent for Heavy Metal Removal from Contaminated Water

Alagappan

Heimann

Morrow

et al. 2017

Sci Rep

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“…Irrespective of the type of the graphene structure, heating a suspension of the fullerenes, carbon fibers and CNTs in nitric acid till it dries gives good results in terms of the growth of nanoparticles around the graphene surface and there is a correlation between the percentage of hydroxyls present on the graphene surface and on the type of growth that occurs on the graphene structure. [34] It has also been reported that the acidtreated CNTs have a shorter length (of approximately 1 mm) than the untreated one due to the stronger reaction of oxidised acids (the acidic mixture of nitric and sulphuric acids) on the graphene structure than nitric acid itself, which introduce several kinds of high oxidation state functional groups and enhance the de-capping and cutting of the CNTs to short segments by introducing carboxylic groups on the graphene structure. [35] The acid treatments of the MWCNTs by oxidised acids (acidic mixture of nitric and sulphuric acids) modify the surface of the graphene structure by introducing functional groups, such as carboxylic, carbonyl and hydroxyl groups on the CNT surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…Also, the most important feature of the polyol process is the deposition of PtNi nanoparticles on the surface of CNTs without any intermediate molecule or nucleus as in the case of the sensitised method. [34][35][36][37][38][39][40][41][42] In the second fabrication method of the Pt/CNTs and the related PtNi/CNT nanocomposites, G4 PAMAM dendrimer is anchored on the CNTs as a platform to load the Pt or PtNi nanoparticles, and sodium borohydride reacts as a reducing agent for the Pt and Ni ions. It is known that well-defined dendrimers with unique structures and compositions could be used to control the size, shape and solubility of Pt and PtNi nanoparticles on the surface of CNTs.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of PtNi bimetallic nanoparticles supported on multi-walled carbon nanotubes

Daoush

Imae

2013

Journal of Experimental Nanoscience

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Platinum/nickel bimetallic nanoparticles supported on multi-walled carbon nanotubes (xPtNi/CNTs) were synthesised. The fabrication process includes the chemical modification on the graphene surface of CNTs by acid treatment and the subsequent deposition of Pt or PtNi bimetallic nanoparticles with different compositions of Pt (x ¼ 100, 90, 80 and 70 wt%). The deposition was carried out using ethylene glycol as a reducing agent in the polyol method or using poly (amidoamine) dendrimer as a platform and sodium borohydride as a reducing agent to load the metal nanoparticles on the CNT surface. The structures of the produced PtNi/CNT nanoparticles were investigated by ultraviolet absorption spectra, X-ray diffraction (XRD) and the composite ratio consisting of 70 wt% of metal content and 30 wt% of CNTs was confirmed by the thermogravimetric analysis. The morphology and the phase identification of the produced PtNi/CNT nanoparticles were investigated by high-resolution scanning electron microscope, transmission electron microscope and XRD measurements. It was observed that the deposited Pt and PtNi bimetallic nanoparticles on the surface of CNTs had average particle sizes of 2-16 nm, when they were prepared from the polyol method. On the other hand, the PtNi/CNT nanoparticles prepared by using a dendrimer as an intermediate had a smaller particle size and more uniform size distribution of the quantum dot size ranged from 2 to 4 nm.

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“…5c and d). This latter observation is reminiscent of silica coated CNTs [22,23], which is expected since SA was used to grow silica coatings on SDS-solubilized SWCNTs. Thus, it would appear that the initial formation of SiO2-coated MWCNTs is followed by silicate growth on the template, while excess CaCO3 crystals may be seen as large crystallites (ca.…”

mentioning

confidence: 87%

“…We have reported that surfactants typically used to solubilize CNTs also modify the morphology in the CaCO3/SiO2 system [20] and so it is important to differentiate between the effects of the CNTs and those of the surfactant. The hydration of the calcium silicate materials reported by Allen et al determines the final morphology and particle size, which is related with various mechanical and chemical properties of cement based materials as well as other composites [21], so a study of the effect of the CNTs on the hydration processes in different CaCO3/SiO2 systems is of interest given the effects observed in the SiO2 and CaCO3 systems [16,22,23].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanotubes on calcium carbonate/calcium silicate phase and morphology

Gómez

Correas

Barron

2017

MGC

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The composition and microstructure of different CaCO3-Ca2SiO4-carbon nanotube composites have been studied. Materials have been characterized by X-ray diffraction (XRD), high resolution scanning electron microscopy (SEM), thermogravimetric/differential thermal analysis (TG/DTA), and Fourier-transform infrared (FTIR) spectroscopy. The morphology and structure of the inorganic systems are affected by the presence of multiwall carbon nanotubes (MWCNT) during the hydration processes and the nature of the MWCNT/SDS interface plays a role in the curing stages of the composite enhancing the growth of calcium silicate.

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Silica coating of vapor grown carbon fibers

Cited by 11 publications

References 19 publications

Easily Regenerated Readily Deployable Absorbent for Heavy Metal Removal from Contaminated Water

Easily Regenerated Readily Deployable Absorbent for Heavy Metal Removal from Contaminated Water

Fabrication of PtNi bimetallic nanoparticles supported on multi-walled carbon nanotubes

Effect of carbon nanotubes on calcium carbonate/calcium silicate phase and morphology

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