Adsorption properties of biochars obtained by KOH activation

Abstract In this study four kinds of biochars were prepared from the KOH modified biomass. As carbon precursors there was used sawdust following trees: oak, hornbeam, apple and cherry. The physicochemical properties materials characterized by N 2 adsorption, scanning electron microscopy, thermal analysis (TG, DTG DTA), infrared spectroscopy, Boehm’s titration method. Moreover, pH pzc (the point zero charge) determined. adsorption capacity temperature-programmed desorption ammonia also studied. obtained activated large specific surface area (672 to 912 m /g) total pore volume (0.30 0.4 cm 3 as well well-developed microporous structure (85–97%). These observations confirmed SEM analysis. maximum NH biochar determined be 3.05 mmol/g. results prove that various origins is appropriate prepare a cost-effective, environmentally friendly biochar.