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首页> 外文期刊>Journal of environmental science and health >Adsorption behavior of α-cypermethrin on cork and activated carbon
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Adsorption behavior of α-cypermethrin on cork and activated carbon

机译：α-氯氰菊酯在软木和活性炭上的吸附行为

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摘要

Studies were undertaken to determine the adsorption behavior of α-cypermethrin [R)-α-cyano-3-phenoxybenzyl(lS)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, and (S)-α-cyano-3-phenoxybenzyl (lR)-ciy-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 a-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 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 a-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.
机译：进行了研究以确定α-氯氰菊酯[R]-α-氰基-3-苯氧基苄基（IS）-顺式3-（2,2-二氯乙烯基）-2,2-二甲基环丙烷羧酸酯和（S）-软木和活性炭（GAC）颗粒上的溶液中的α-氰基-3-苯氧基苄基（lR）-ciy-3-（2,2-二氯乙烯基）-2,2-二甲基环丙烷羧酸盐]。吸附研究是使用间歇平衡技术进行的。使用C18圆盘固相萃取后，使用带有电子捕获检测器（GC-ECD）的气相色谱仪分析α-氯氰菊酯。通过水银孔隙率法评估包括软木塞的实际密度，孔体积，表面积和孔径的物理性质。软木颗粒的表征显示出变化，从而表明了材料的高度异质结构。软木颗粒的平均表面积低于GAC。动力学吸附研究可以确定软木（1-2 mm和3-4 mm）和GAC的平衡时间-24小时。对于所研究的α-氯氰菊酯浓度范围，GAC显示是更好的吸附剂。然而，通过Langmuir和Freundlich模型获得的平衡浓度的吸附参数显示，软木塞1-2 mm具有最大量的α-氯氰菊酯（q_m）吸附（303μg/ g）。 GAC（186μg/ g）和软木3-4 mm（136μg/ g）。标准偏差（SD）值表明，Freundlich模型可以更好地描述a-氯氰菊酯在GAC上的吸附现象，而α-氯氰菊酯在软木塞（1-2 mm和3-4 mm）上的吸附可以用Langmuir更好地描述。鉴于这项研究中获得的吸附结果，看来软木塞软膏可能是从水中去除α-氯氰菊酯的GAC的更好，更便宜的替代品。

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