Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/2983
Título: Adsorption behavior of α-cypermethrin on cork and activated carbon
Autor: Domingues, Valentina F.
Priolo, Giuseppe
Alves, Arminda
Cabral, Miguel
Delerue-Matos, Cristina
Palavras-chave: Adsorption
Activated carbon
Cypermethrin
Cork
Pesticide
Pyrethroid
Data: 2007
Editora: Taylor & Francis
Relatório da Série N.º: Journal of Environmental Science and Health Part B; Vol. 42, Issue 6
Resumo: Studies were undertaken to determine the adsorption behavior of α-cypermethrin [R)-α-cyano-3-phenoxybenzyl(1S)-cis- 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, and (S)-α-cyano-3-phenoxybenzyl (1R)-cis-3-(2,2-dichlorovinyl)-2,2- dimethylcyclopropanecarboxylate] in solutions on granules of cork and activated carbon (GAC). The adsorption studies were carried out using a batch equilibrium technique. A gas chromatograph with an electron capture detector (GC-ECD) was used to analyze α-cypermethrin after solid phase extraction with C18 disks. Physical properties including real density, pore volume, surface area and pore diameter of cork were evaluated by mercury porosimetry. Characterization of cork particles showed variations thereby indicating the highly heterogeneous structure of the material. The average surface area of cork particles was lower than that of GAC. Kinetics adsorption studies allowed the determination of the equilibrium time—24 hours for both cork (1–2 mm and 3–4 mm) and GAC. For the studied α-cypermethrin concentration range, GAC revealed to be a better sorbent. However, adsorption parameters for equilibrium concentrations, obtained through the Langmuir and Freundlich models, showed that granulated cork 1–2 mm have the maximum amount of adsorbed α-cypermethrin (qm) (303 μg/g); followed by GAC (186 μg/g) and cork 3-4 mm (136 μg/g). The standard deviation (SD) values, demonstrate that Freundlich model better describes the α-cypermethrin adsorption phenomena on GAC, while α-cypermethrin adsorption on cork (1-2 mm and 3-4 mm) is better described by the Langmuir. In view of the adsorption results obtained in this study it appears that granulated cork may be a better and a cheaper alternative to GAC for removing α-cypermethrin from water.
Peer review: yes
URI: http://hdl.handle.net/10400.22/2983
Versão do Editor: http://www.tandfonline.com/doi/abs/10.1080/03601230701465635#.UpXQqUr6Q25
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