Abstract
Crushed apricot stone shells were impregnated with varying H 3 PO 4 acid concentrations (20-50 wt%), followed by carbonisation at 573-773 K. The products were characterised by nitrogen gas adsorption. Analysis of the nitrogen isotherms by the DR and α s methods proved that most of the obtained carbons are highly microporous, with high surface areas (≥1000 m 2 /g) and very low mesoporosity. Increasing acid concentration, at 573 and 673 K, increases surface area and pore volume, whereas at 733 K a small decrease in both parameters appears at higher H 3 PO 4 concentrations. Whole apricot stones produce activated carbon of inferior porous characteristics. Development of the extensive pore structure was described in light of the effect of H 3 PO 4 on the lignocellulosic material during carbonisation.
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