Adsorption behavior of α -cypermethrin on cork and activated carbon

Abstract

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 (q m ) (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.

Use of green coating (cork) in solid-phase microextraction for the determination of organochlorine pesticides in water by gas chromatography-electron capture detection

“…The sorption potential of cork for the removal of some pollutants, such as PAHs, bifenthrin, alphacypermethrin, acetaminophen and chrysoidine, from aqueous solutions has been evaluated [14][15][16][17][18]. The use of cork as a new (green) coating for SPME was introduced by our group and initially the new fiber was employed for the determination of PAHs in river water samples [11].…”

Organic xenobiotics removal in constructed wetlands, with emphasis on the importance of the support matrix

“…The list of materials that have been tested in such studies is long (and still increasing). Some examples include pine bark [282,283,302,304,305], almond shells [292,307], banana peels [284,293], sawdust [153,285,300], coconut fibers [285], rice bran [271,287], rice husk [271,287], moringa pods [271], hazelnut shells [299,300], wood residues [286], cork wastes [85,153,154,289,295,303,306] and chickpea husk [288]. In addition, assays have also been conducted with some of these materials after submitting them to more or less complex treatments (usually thermal), e.g.…”

“…A small illustrative sample of the tests that have been conducted to study the adsorption of organic pollutants by activated carbon is presented in Table 2. Among the most commonly tested organic substances, several examples can be found including dyes [141][142][143][144][145][146], phenolic compounds [147][148][149], pesticides [150][151][152][153][154], pharmaceuticals [155][156][157][158] and many other organic pollutants [159][160][161].…”

“…Recent literature reports several studies on the effective adsorption of many organic compounds such as pesticides [153,154,271,[282][283][284][285][286][287][288][289], phenolic compounds [290][291][292][293][294][295], dyes [144,[296][297][298][299][300][301], PAHs [302,303], explosives [304] and pharmaceuticals and hormonal compounds [85,[305][306][307] by a variety of adsorbents prepared from agricultural wastes. The list of materials that have been tested in such studies is long (and still increasing).…”

Binding interactions between suberin monomer components and pesticides

“…Raw cork biosorption features towards organic pollutants have been recently investigated (Crespo-Alonso et al, 2013;Domingues et al, 2005Domingues et al, , 2007Nurchi et al, 2014;Olivella et al, 2011aOlivella et al, , 2011b. Nevertheless, studies regarding the role of suberin in sorption processes are still scarce.…”