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Synthesis and Growth of Green graphene from Biochar Revealed by Magnetic Properties of Iron Catalyst

Abstract : Understanding the mechanism of iron-catalyzed graphitization of biomass is an important step for the large-scale synthesis of green graphene. Although iron is known to be the most active transition metal for the catalytic graphitization of cellulose-derived biochar, the direct effect of the iron molecular structure on the formation of highly graphitic carbon remains elusive. Here, biochar has been produced from pyrolysis of iron-impregnated cellulose at three different temperatures 1000°C, 1400°C, and 1800°C. X-ray diffraction, X-ray photoelectron spectroscopy and magnetic measurements are used to probe changes in biochar nanostructure that is catalyzed by the inclusion of iron. We find that an increase of pyrolysis temperature leads to an increase in the iron particle size and the degree of iron reduction, as well as the formation of larger graphitic carbon crystallite sizes, and these two attributes of iron are seen to positively affect the biochar graphitization usually challenging under 2000°C.
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Submitted on : Monday, November 7, 2022 - 1:59:11 PM
Last modification on : Wednesday, November 9, 2022 - 3:06:25 AM

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Amel Ghogia, Lina Maria Romero Millan, Claire White, Ange Nzihou. Synthesis and Growth of Green graphene from Biochar Revealed by Magnetic Properties of Iron Catalyst. ChemSusChem, In press, ⟨10.1002/cssc.202201864⟩. ⟨hal-03842181⟩

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