Production and characterization of activated carbon from apricot stones

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Bilimleri Enstitüsü, Fen Bilimleri Enstitüsü, Türkiye

Tezin Onay Tarihi: 2004

Öğrenci: NEZİH URAL YAĞŞİ

Danışman: HAYRETTİN YÜCEL

Özet:

In this study, characterization of activated carbon produced from apricot stones by chemical activation technique using phosphoric acid (H3PO4) as activating agent, at relatively low temperatures (300, 400 and 500oC), was investigated. To produce activated carbon acid impregnated samples were heated; at a heating rate of 20oC/min to the final carbonization temperatures, 300oC, 400oC and 500oC. For each temperature four different carbonization time (90, 120, 180 and 210 min.) were used to produce twelve different activated carbons. The pore structures of activated carbons were determined as follows: The volume and area of macropores in the pore diameter range of 8180-50 nm were determined by mercury intrusion porosimetry. Mesopore (in the range of 50-2 nm) areas and volumes were determined by N2 gas adsorption technique at -195.6oC, BET surface areas of the samples were also determined, in the relative pressure range of 0.05 to 0.02, by the same technique. The pore volume and the area of the micropores with diameters less than 2 nm were determined by CO2 adsorption measurements at 0oC by the application of Dubinin Radushkevich equation. N2 (BET) and CO2 (D-R) surface areas of the samples were in the range of 444-709m2/g and 433-650m2/g, respectively. AC4.2 sample (carbonization temperature of 400oC and carbonization time of 120 min.) was found to have the maximum BET and CO2 area as 709m2/g and 650m2/g, respectively. Surface areas of the samples consisting of around 10% mesopores and over 90% micropores. N2 adsorption isotherms also confirm that pores are in the micropore range.