COMPOSITE OF GRAPHENE OXIDE AND HUMIC ACIDS: RESULTS OF HIGH-TEMPERATURE TREATMENT

Humic acids (HA) and HA derived carbon (HADC), obtained by heating HA at 900 oC in inert atmosphere, has been studied by solid-state nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Raman spectroscopy and the method of standard contact porosimetry (SCP). Mass spectrometry was also used for analysis of gases released upon heating of the samples. The composite of HA with graphene oxide (HA+GO) derived carbon has been prepared using carbonization of HA+GO in an inert atmosphere at 900 °C. Small agglomerates of carbon with sharply defined edges have been obtained because of carbonization of HA, and the composite of HA+GO forms only large aggregates at the same condition. The values of specific surface area of HADC and (HA+GO)DC are 173 and 474 m2 /g, respectively. The value of specific surface correspond to the area of all pores (Spore) is equal to only 3 m2 /g in the case of HADC. In the case of the (HA+GO)DC, Spore is equal to 237 m2 /g.

humic acids, graphene oxide, composite, heat treatment, porosity

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