<br>农业用可生物降解地膜中农药吸附/解吸过程的评价,Chemosphere

当前位置： X-MOL 学术 › Chemosphere › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

农业用可生物降解地膜中农药吸附/解吸过程的评价
Chemosphere ( IF 8.1 ) Pub Date : 2024-01-09 , DOI: 10.1016/j.chemosphere.2024.141183
Harshit Sahai ₁ , María Dolores Hernando ₂ , María Jesús Martínez Bueno ₃ , Ana M Aguilera Del Real ₃ , Amadeo R Fernández-Alba ₃

Affiliation

地膜中的微塑料可能是农业土壤化学污染的来源。在这种背景下，可生物降解薄膜已被广泛定位为更环保的选择。然而，与传统塑料类型相比，它们的吸附/解吸能力仍未得到充分研究。正是由于这个原因，客观评估它们与残留农业污染物的相互作用变得很重要。我们的研究结果表明，聚乙烯 (PE) 地膜保留了较低量的农药残留，并表现出较高的解吸/释放量 [中位解吸 = 71.86 μg/L 或约 50%]，而聚己二酸对苯二甲酸丁二醇酯 (PBAT) 地膜保留了较高量的农药残留。农药残留在其表面上，并且在喷洒事件后表现出低得多的解吸[中值解吸 = 24.27 μg/L 或约 17%]。较高的环境温度对 PE [中值 = 65.27 μg/L（20 °C 时）和 74.23 μg/L（40 °C 时）] 和 PBAT（中值 = 24.26 μg/L（20 °C 时）和 PBAT）的最终解吸量没有显着影响。 40 °C 时为 24.78 μg/L] 地膜。然而，它确实有利于 PE 薄膜更快的解吸速度。 PBAT 和 PE 塑料类型的解吸与 log K 值相关 [Spearman 相关性：分别为 0.857 和 0.837，p < 0.05]。然而，在 PBAT 中仅观察到与 pKa 具有中等相关性 [Spearman 相关性：0.478，p < 0.05]，而 PE 塑料类型则没有观察到。 Elovich [R: 0.937–0.959] 和伪二级动力学 [R: 0.942–0.987] 最好地解释了农药在可生物降解的 PBAT 微塑料上的吸附，表明存在化学吸附。此外，韦伯莫里斯图表明存在多步骤过程，博伊德图表明薄膜扩散或化学键形成是控制这种现象的限速步骤。

"点击查看英文标题和摘要"

Evaluation of the sorption/desorption processes of pesticides in biodegradable mulch films used in agriculture

Microplastics from mulch films can be a source of chemical contamination to agricultural soils. In this context, biodegradable films have been widely positioned as a greener choice. However, their sorption/desorption capabilities, in contrast to the conventional plastic types remain understudied. It is for this reason that objective evaluation of their interactions with residual agricultural contaminants becomes important. Our findings reveal that polyethylene (PE) mulch films retained lower amounts of pesticide residues and demonstrated a higher desorption/release [median desorption = 71.86 μg/L or about 50%], while polybutylene adipate terephthalate (PBAT) mulch films retained higher amounts of pesticide residues onto their surface and demonstrated a much lower desorption [median desorption = 24.27 μg/L or about 17%] after a spraying event. A higher ambient temperature had no significant effect on final desorption amounts in both PE [median = 65.27 μg/L at 20 °C and 74.23 μg/L at 40 °C] and PBAT [median = 24.26 μg/L at 20 °C and 24.78 μg/L at 40 °C] mulch films. However, it did favour a faster desorption pace in PE films. Desorption in PBAT and PE plastic types was correlated with the log K value [Spearman's correlation: 0.857 and 0.837 respectively, p < 0.05]. However, only a moderate correlation with pKa was observed in PBAT [Spearman's correlation: 0.478, p < 0.05], while none for PE plastic type. Sorption of pesticides onto biodegradable PBAT microplastics were best explained by Elovich [R: 0.937–0.959] and pseudo-second order kinetics [R: 0.942–0.987], suggesting the presence of chemisorption. Furthermore, Weber Morris plots suggested the presence of a multi-step process and Boyd plots indicated that film diffusion or chemical bond formation was the rate-limiting step governing this phenomenon.

更新日期：2024-01-09

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南