Structural and proactive safety aspects of oxidation debris from multiwalled carbon nanotubes

Stéfani, Diego; Paula, Amauri J.; Vaz, Boniek G.; Silva, Rodrigo A.; Andrade, N. F.; Justo, Giselle Z.; Ferreira, Carmen V.; Filho, A. G. Souza; Eberlin, Marcos N.; Alves, Oswaldo Luiz

doi:10.1016/j.jhazmat.2011.02.050

Cited by 57 publications

(38 citation statements)

References 63 publications

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“…The spectra collected for the samples modified with nitric acid exhibit the additional absorption bands at 1355 and 1568 cm -1 providing the presence of nitro groups on the carbon surface [39][40][41][42]. It is noteworthy that the intensity of the discussed above bands increases with concentration of the oxidizing agent suggesting a higher content of surface oxygen-containing groups compared to the unmodified sample.…”

Section: Surface Composition Of Modified Cmk-3 Replicamentioning

confidence: 91%

“…Broad complex bands in the range of 1300-1450 and 1100-1300 cm -1 correspond to the C-H bending vibrations (in -CH 2 and -CH 3 groups) and stretching vibrations of carbonyl and ether moieties, respectively [39][40][41]. The spectra collected for the samples modified with nitric acid exhibit the additional absorption bands at 1355 and 1568 cm -1 providing the presence of nitro groups on the carbon surface [39][40][41][42].…”

Section: Surface Composition Of Modified Cmk-3 Replicamentioning

confidence: 99%

“…The DRIFT spectra recorded for the undiluted samples after subtracting the spectrum of the parent carbon replica are displayed in and/or carboxylic anhydride [18,[37][38][39][40]. The band at 1587 cm -1 can be ascribed to the C-C stretching vibrations in aromatic ring as well as quinone and keto-enol groups [18,37,39,40].…”

Section: Surface Composition Of Modified Cmk-3 Replicamentioning

confidence: 99%

“…The band at 1587 cm -1 can be ascribed to the C-C stretching vibrations in aromatic ring as well as quinone and keto-enol groups [18,37,39,40].…”

Section: Surface Composition Of Modified Cmk-3 Replicamentioning

confidence: 99%

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Chemically activated poly(furfuryl alcohol)-derived CMK-3 carbon catalysts for the oxidative dehydrogenation of ethylbenzene

Janus

Kuśtrowski

et al. 2014

Catalysis Today

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The surface of CMK-3 carbon, synthesized by the reversible replication of mesoporous silica (SBA-15) using poly(furfuryl alcohol) as a carbon precursor, was activated by wet oxidation with an aqueous solution of HNO 3 or H 2 O 2 . The process was performed at 50°C using solution containing different concentrations of the oxidizing agent. It was found that during the modification no significant changes in textural and structural properties of CMK-3 replica occurred. However, the treatment resulted in the formation of appreciable amounts of surface species containing oxygen. XPS and DRIFT spectroscopy allowed to identify and quantify the surface functional groups. Their stability was studied by TG-FTIR measurements. CO and CO 2 were found as main gaseous products evolved during thermal decomposition under inert atmosphere. Finally, the modified samples were tested in the catalytic oxidative dehydrogenation * Corresponding author. Tel. +48 12 6632006. Fax +48 12 6340515. E-mail address: kustrows@chemia.uj.edu.pl (P. Kuśtrowski) 2 of ethylbenzene to styrene at 350°C in the presence of oxygen as an oxidizing agent (at O 2 /ethylbenzene molar ratio of 1.0 and 3.0). At the beginning of the catalytic run, the highest styrene yield and selectivity was achieved at the lower O 2 content over the catalysts treated with nitric acid. Nevertheless, all studied catalysts underwent a gradual deactivation due to coke formation and changes in the distribution of surface moieties.

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Section: Surface Composition Of Modified Cmk-3 Replicamentioning

confidence: 91%

Section: Surface Composition Of Modified Cmk-3 Replicamentioning

confidence: 99%

Section: Surface Composition Of Modified Cmk-3 Replicamentioning

confidence: 99%

“…The band at 1587 cm -1 can be ascribed to the C-C stretching vibrations in aromatic ring as well as quinone and keto-enol groups [18,37,39,40].…”

Section: Surface Composition Of Modified Cmk-3 Replicamentioning

confidence: 99%

See 2 more Smart Citations

Chemically activated poly(furfuryl alcohol)-derived CMK-3 carbon catalysts for the oxidative dehydrogenation of ethylbenzene

Janus

Kuśtrowski

et al. 2014

Catalysis Today

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“…And the peak at 1081 cm −1 (Fig. 1F) can be assigned to C O C asymmetrical stretching [35]. The peak at 1630 cm −1 (Fig.…”

Section: Resultsmentioning

confidence: 91%

Carbon nanoparticles pillared multi-walled carbon nanotubes for adsorption of 1-naphthol: Thermodynamics, kinetics and isotherms

Jiao

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Redox‐enzymes, cells and micro‐organisms acting on carbon nanostructures transformation: A mini‐review

Seabra

Paula

Durán

2013

Biotechnology Progress

Self Cite

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Carbon nanotubes, graphene and fullerenes are actual nanomaterials with many applications in different industrial areas, with increasing potentialities in the field of nanomedicine. Recently, different proactive approaches on toxicology and safety management have become the focus of intense interest once the industrial production of these materials had a significant growth in the last years, even though their short- and long-term behaviors are not yet fully understood. The most important concerns involving these carbon-based nanomaterials are their stability and potential effects of their life cycles on animals, humans, and environment. In this context, this mini review discuss the biodegradability of these materials, particularly through redox-enzymes, micro-organisms and cells, to contribute toward the design of biocompatible and biodegradable functionalized carbon nanostructures, in order to use these materials safely and with minimum impact on the environment.

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Structural and proactive safety aspects of oxidation debris from multiwalled carbon nanotubes

Cited by 57 publications

References 63 publications

Chemically activated poly(furfuryl alcohol)-derived CMK-3 carbon catalysts for the oxidative dehydrogenation of ethylbenzene

Chemically activated poly(furfuryl alcohol)-derived CMK-3 carbon catalysts for the oxidative dehydrogenation of ethylbenzene

Carbon nanoparticles pillared multi-walled carbon nanotubes for adsorption of 1-naphthol: Thermodynamics, kinetics and isotherms

Redox‐enzymes, cells and micro‐organisms acting on carbon nanostructures transformation: A mini‐review

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