N-butyl Mercaptan Adsorption on Activated Carbon in Aqueous Phase

Adsorption of aqueous n-butyl mercaptan on Granular/Powder Activated Carbon is studied at pH 5-12.4 and 301 K/313 K. In GAC mercaptan blocks micropores and mesopores, whereas in PAC the broader mesopores remain intact providing access to micropores. Mercaptan is transformed into isomer disulfides an...

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Bibliographic Details
Published inSeparation science and technology Vol. 46; no. 13; pp. 2004 - 2021
Main Authors Matsis, Vassileios M., Grigoropoulou, Helen P.
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.08.2011
Subjects
activated carbon
adsorption
aqueous phase
N-butyl mercaptan
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Summary:Adsorption of aqueous n-butyl mercaptan on Granular/Powder Activated Carbon is studied at pH 5-12.4 and 301 K/313 K. In GAC mercaptan blocks micropores and mesopores, whereas in PAC the broader mesopores remain intact providing access to micropores. Mercaptan is transformed into isomer disulfides and non-extractable sulfur forms following acid-base or oxidation-reduction reaction depending on carbon surface groups and iron, and dissolved oxygen. Adsorption obeys a Langmuir isotherm, with oxygen competing with mercaptan (<100 mg mercaptan/L), followed by a Dubinin-Raduschkevich isotherm. Mercaptan uptake increases with temperature. Free energy values suggest that the Langmuir part represents hydrogen bonds whereas the Dubinin-Raduschkevic part the van der Waals ones.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2011.591647