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United States Department of Agriculture

Agricultural Research Service

Title: Nutshells As Granular Activated Carbons: Physical, Chemical and Adsorptive Properties

item Wartelle, Lynda
item Marshall, Wayne
item Toles, Christopher - NORTHEASTER UNIV MA

Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: January 16, 2001
Publication Date: N/A

Technical Abstract: Nutshells from five different sources (almond, black walnut, English walnut macadamia nut, pecan) were converted to granular activated carbons (GACs) b carbon dioxide activation. A portion of the GACs were exposed to compresse air and the physical (yield, surface area, attrition), chemical (pH, surfac charge) and adsorptive (organics uptake, metal ion uptake) properties of bo ooxidized and non-oxidized carbons were determined. The source material appeared to affect all three groups of properties for both oxidized and non oxidized carbons with major differences observed between almond shells and other four nutshells. Differences in organics uptake, especially of polar compounds, were also found between GACs made from almond shells, the group consisting of black walnut shells, English walnut shells and pecan shells, macadamia nutshells. Oxidation had its greatest effects on pH, surface cha and uptake of metal ions. The changes due to oxidation were found to be independent of carbon source material. GACs with specific properties can produced with judicious selection of carbon precursor and oxidative treatme

Last Modified: 4/18/2015
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