Adsorption behavior of alpha-cypermethrin on cork and activated carbon

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Valentina E Domingues (Author) Other; Giuseppe Priolo (Author) Other; Arminda C Alves (Author) FEUP; Miguel E Cabral (Author) Other; Cristina Delerue Matos (Author) Other

Journal

Title: Journal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes

Vol. 42

Pages: 649-654

ISSN: 0360-1234

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 33 Citations

Scopus - 34 Citations

Scientific classification

FOS: Medical and Health sciences > Health sciences

Other information

Authenticus ID: P-004-8GA

DOI: 10.1080/03601230701465635

Abstract (EN): Studies were undertaken to determine the adsorption behavior of ci-cypermethrin [R)-ci-cyano-3-phenoxybenzyl(IS)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, and (S)-a-cyano-3-phenoxybenzyl (IR)-cis-3-(2,2-dichlorovinyl)-2,2dimethylcyclopropanecarboxylate] 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 a-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 alpha-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 a-cypermethrin (q(m),) (303 mu g/g); followed by GAC (186 mu g/g) and cork 3-4 mm (136 mu g/g). The standard deviation (SD) values, demonstrate that Freundlich model better describes the a-cypermethrin adsorption phenomena on GAC, while a-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 a-cypermethrin from water.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6