The Evaluation of Properties of Chars Produced from Wastes of Different Origins

This paper presents a screening of primary char samples produced through the hydrothermal liquefaction of biomass. Currently, numerous studies demonstrate the potential of hydrothermal conversion char residues as sorbents. The relevance of this work lies in utilizing materials that are rarely used in other areas of production, such as aquatic vegetation, organic waste, algae, bark and wood waste, food waste, and waste from the agro-industrial complex. This study aims to evaluate the sorption capacity (for iodine, phenol, and methylene blue) of char sorbents obtained from various raw materials via hydrothermal liquefaction and to identify the most suitable raw materials. To assess the charcoals, their elemental composition and sorption capacities for methylene blue, iodine, and phenol were analyzed. The average yield of charcoal was 35%. The results indicate that the obtained chars demonstrated the highest sorption capacity for methylene blue (up to 239 mg.g-1), while phenol sorption was the lowest (not exceeding 19 mg.g-1). These findings suggest that the produced chars are promising raw materials for the production of sorbents.