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Adsorption of naphthalene from aqueous solution on activated carbons obtained from bean pods

AuthorsCabal Álvarez, Belén; Budinova, Temenuzhka; Ovín Ania, María Concepción ; Tsyntsarski, Boyko; Parra Soto, José Bernardo ; Petrova, Bilyana
Bean pods
K2CO3 activation
Water vapor activation
Issue Date30-Jan-2009
CitationJournal of Hazardous Materials 161(2/3): 1150-1156 (2009)
AbstractThe preparation of activated carbons from bean pods waste by chemical (K2CO3) and physical (water vapor) activation was investigated. The carbon prepared by chemical activation presented a more developed porous structure (surface area 1580 m2 g−1 and pore volume 0.809 cm3 g−1) than the one obtained by water vapor activation (258 m2 g−1 and 0.206 cm3 g−1). These carbons were explored as adsorbents for the adsorption of naphthalene from water solutions at low concentration and room temperature and their properties are compared with those of commercial activated carbons. Naphthalene adsorption on the carbons obtained from agricultural waste was stronger than that of carbon adsorbents reported in the literature. This seems to be due to the presence of large amounts of basic groups on the bean-pod-based carbons. The adsorption capacity evaluated from Freundlich equation was found to depend on both the textural and chemical properties of the carbons. Naphthalene uptake on biomass-derived carbons was 300 and 85 mg g−1 for the carbon prepared by chemical and physical activation, respectively. Moreover, when the uptake is normalized per unit area of adsorbent, the least porous carbon displays enhanced naphthalene removal. The results suggest an important role of the carbon composition including mineral matter in naphthalene retention. This issue remains under investigation.
Description7 pages, 5 figures, 4 tables. -- PMID: 18541368 [PubMed]. -- Available online 3 May 2008.
Publisher version (URL)http://dx.doi.org/10.1016/j.jhazmat.2008.04.108
Appears in Collections:(INCAR) Artículos
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