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Carbon nanostructures-modified expanded vermiculites produced by chemical vapor deposition from ethanol
Abstract In this work, chemical vapor deposition using ethanol and FeMo catalysts at 600, 700, 800 and 900°C was used to modify the surface of expanded vermiculite (EV). Scanning electron microscopy, Raman spectroscopy, X-ray diffraction, Mössbauer spectra, N2-BET surface areas, and carbon elemental analyses suggested that the FeMo catalyst promoted 2–3% growth of carbon in different forms, mainly nanofibers, on the EV surface. The amount of 2–3% carbon produced by ethanol/CVD process on EV produced a 500% increase in the absorption of soybean, diesel and engine oil, with a concomitant decrease on water absorption. These results were discussed in terms of a hydrophobization of the EV surface by the carbon structures and a “sponge-like” effect due to the entangled nanofibers structure, as it was observed by microscopy, and an increase of N2-BET surface area from 3m2 g−1 for EV up to 21m2 g–1 for the ethanol CVD-treated EV.
Highlights ► Ethanol/CVD was used to create carbon on expanded vermiculite (EV) surface. ► 3% of carbon grown on EV can increase up to 500% in the oil sorption capacity. ► The hydrophobization of the EV is discussed in terms of a “sponge-like” effect. ► The “sponge-like” effect can be explained by the entangled nanofibers structure.
Carbon nanostructures-modified expanded vermiculites produced by chemical vapor deposition from ethanol
Abstract In this work, chemical vapor deposition using ethanol and FeMo catalysts at 600, 700, 800 and 900°C was used to modify the surface of expanded vermiculite (EV). Scanning electron microscopy, Raman spectroscopy, X-ray diffraction, Mössbauer spectra, N2-BET surface areas, and carbon elemental analyses suggested that the FeMo catalyst promoted 2–3% growth of carbon in different forms, mainly nanofibers, on the EV surface. The amount of 2–3% carbon produced by ethanol/CVD process on EV produced a 500% increase in the absorption of soybean, diesel and engine oil, with a concomitant decrease on water absorption. These results were discussed in terms of a hydrophobization of the EV surface by the carbon structures and a “sponge-like” effect due to the entangled nanofibers structure, as it was observed by microscopy, and an increase of N2-BET surface area from 3m2 g−1 for EV up to 21m2 g–1 for the ethanol CVD-treated EV.
Highlights ► Ethanol/CVD was used to create carbon on expanded vermiculite (EV) surface. ► 3% of carbon grown on EV can increase up to 500% in the oil sorption capacity. ► The hydrophobization of the EV is discussed in terms of a “sponge-like” effect. ► The “sponge-like” effect can be explained by the entangled nanofibers structure.
Carbon nanostructures-modified expanded vermiculites produced by chemical vapor deposition from ethanol
Purceno, Aluir D. (author) / Barrioni, Breno R. (author) / Dias, Anderson (author) / da Costa, Geraldo M. (author) / Lago, Rochel M. (author) / Moura, Flávia C.C. (author)
Applied Clay Science ; 54 ; 15-19
2011-06-19
5 pages
Article (Journal)
Electronic Resource
English
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