Abstract
The article discusses the synthesis of activated biocarbon from wheat straw and the study of the structural parameters of this biocarbon. The synthesis occurs without a protective atmosphere, and a 5% aqueous solution of orthophosphoric acid is used as an activator during thermal activation. X-ray diffraction, small-angle X-ray scattering, and isothermic adsorption/desorption of nitrogen were used to study the synthesized activated biocarbon. It is found that the synthesized biocarbon is has an amorphous structure, as evidenced by the wide diffuse maxima on the radiographs, close in position to the reflexes of polycrystalline graphite. The analysis of the X-ray low-angle scattering spectra shows that this formation has a fractal structure, which consists of mass fractals with the size of fractal aggregates of 45–57 nm and 60–80 nm. It is shown that nitrogen adsorption/desorption isotherms are characterized by the presence of a hysteresis loop of Type H4. This corresponds to the porous structure, which is mainly determined by slit-like micropores in the presence of a certain number of mesopores of a small radius. The parameters of the porous structure are evaluated using various methods. It was found that the suggested synthesis method allows obtaining biocarbon with pores of a nanometer size of about 2 nm.
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Ptashnyk, V., Bordun, I., Szymczykiewicz, E. et al. The investigation of the structure of biocarbon synthesized from wheat straw after weakly concentrated phosphoric acid pretreatment. Appl Nanosci 13, 4883–4890 (2023). https://doi.org/10.1007/s13204-022-02641-0
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DOI: https://doi.org/10.1007/s13204-022-02641-0