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Adsorption-Desorption Behaviour of Pyridalyl on Clays

机译：吡啶基在粘土上的吸附-解吸行为

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摘要

The study reports the adsorption-desorption of pyridalyl on three clays. Clays showed very high adsorption of pyridalyl and the Freundlich adsorption coefficient (K_f) values for pyridalyl on kaolinite, montmorillonite and nano-bentonite were 885.1, 4360.1 and 6031.1, respectively. Thus, nano-bentonite clay showed maximum pyridalyl adsorption followed by montmorillonite and kaolinite. Pyridalyl sorption in clay showed positive correlation with cation exchange capacity of clays while negative correlation was observed with clay particle size. Desorption of pyridalyl from clays followed the order: montmorillonite > nano-bentonite > kaolinite. Thus, nano-bentonite, which showed maximum pyridalyl adsorption, did not retain maximum amount of sorbed insecticide. The K_f desorption coefficient for pyridalyl in montmorillonite clay was 10 times higher than that in nano-bentonite clay. The study suggested that clays can play a significant role in environmental behaviour of pyridalyl.
机译：该研究报道了吡啶基在三种粘土上的吸附-解吸。粘土显示出对吡啶鎓的极高吸附，吡啶鎓在高岭石，蒙脱土和纳米膨润土上的弗氏吸附系数（K_f）值分别为885.1、4360.1和6031.1。因此，纳米膨润土显示出最大的吡啶基吸附，其次是蒙脱土和高岭土。粘土中吡啶基吸附与粘土的阳离子交换能力呈正相关，而与粘土粒径呈负相关。吡啶基从粘土中的解吸顺序为：蒙脱石>纳米膨润土>高岭石。因此，纳米膨润土表现出最大的吡啶酮吸附能力，没有保留最大量的杀虫剂吸附。蒙脱石粘土中吡咯的K_f解吸系数比纳米膨润土高10倍。研究表明，粘土可以在哒哒唑的环境行为中发挥重要作用。

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