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Adsorption Characteristics of Microporous Carbons from Apricot Stones Activated by Phosphoric Acid
Author(s) -
Philip Christine A.,
Girgis Badie S.
Publication year - 1996
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199611)67:3<248::aid-jctb557>3.0.co;2-1
Subject(s) - microporous material , phosphoric acid , adsorption , nitrogen , activated carbon , porosity , volume (thermodynamics) , chemical engineering , materials science , specific surface area , carbon fibers , chemistry , organic chemistry , composite material , metallurgy , catalysis , physics , quantum mechanics , composite number , engineering
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 ‐1 ) 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 mataerial during carbonisation.