The porous structure of activated carbon-based on waste coffee grounds

Abstract

In this paper proposes the development of a reproducible technique for obtaining nanoporous carbon material (NСM) based on waste coffee grounds. Therefore, the processes of carbonization of raw materials from waste coffee grounds were studied using differential thermal and thermogravimetric analyses. It has been established that the mass loss mainly occurs in the temperature range of 250-500 ºС. The characteristics of the porous structure of the obtained carbon materials were determined based on the low-temperature porometry adsorption/desorption isotherms, and it was shown that the carbonization temperature has a significant effect on the specific surface area and pore volume of the NCM. It has been shown that the proposed technique allows obtaining carbon materials with a specific surface area of up to 1050 m2/g. Moreover, the structural parameters of the NCM are determined, namely, the interplanar distance d002, the crystallites size D002, and the number of layers in the crystallite N, which determine the structure of the obtained material by X-ray diffractometer.