Differential adsorption of dinotefuran by biodegradable PBAT and PLA microplastics and the vectoring risk to Escherichia coli

IF 6.7 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

NanoImpact Pub Date : 2026-04-01 Epub Date: 2026-04-20 DOI:10.1016/j.impact.2026.100627

Shuixia Qiu, Xianzhao Zhang, Yan Fang, Fengmao Liu

{"title":"Differential adsorption of dinotefuran by biodegradable PBAT and PLA microplastics and the vectoring risk to Escherichia coli","authors":"Shuixia Qiu, Xianzhao Zhang, Yan Fang, Fengmao Liu","doi":"10.1016/j.impact.2026.100627","DOIUrl":null,"url":null,"abstract":"<div><div>Biodegradable mulch microplastics (BMPs), such as PBAT and PLA, are widely used in agriculture but can persist in soils and carry coexisting pesticides like dinotefuran (DIN). Despite its widespread use, DIN's environmental fate and microbial toxicity remain insufficiently understood. This study explores the adsorption behavior of DIN on PBAT and PLA and assesses the toxicity of MPs‑neonicotinoid complexes. To provide a more comprehensive understanding, two structurally related neonicotinoids, imidacloprid (IMI) and clothianidin (CLO), were included as comparative references. Adsorption kinetics and isotherms were measured, along with multi-scale characterization (SEM, XRD, FT-IR, XPS, contact angle). The results were integrated with <em>Escherichia coli</em> (<em>E.coli</em>) inhibition assays to assess microbial toxicity. PBAT exhibited a rougher surface with lower crystallinity (7.8% vs 17.1%), and greater hydrophobicity (contact angle 107.7° vs 92.9°) compared to PLA. This increased hydrophobicity likely contributed to the higher adsorption capacity of PBAT for DIN, as confirmed by Langmuir isotherm fitting (Q<sub>m</sub> ≈ 15.2 mg·kg<sup>−1</sup> for PBAT vs Q<sub>m</sub> ≈ 4.69 mg·kg<sup>−1</sup> for PLA). FT-IR/XPS indicated hydrogen-bonding/dipole interactions acting cooperatively with hydrophobic association. Increasing CaCl<sub>2</sub> (0–0.1 mol·L<sup>−1</sup>) enhanced adsorption while NaCl produced a biphasic response, that is low-level promotion, mid-high suppression. MPs-DIN mixtures more strongly inhibited <em>E.coli</em> than single exposures. These results identify BMPs as potential vectors of neonicotinoids and highlight polymer chemistry and environmental modulators in co-exposure risk assessments.</div></div>","PeriodicalId":18786,"journal":{"name":"NanoImpact","volume":"42 ","pages":"Article 100627"},"PeriodicalIF":6.7000,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"NanoImpact","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2452074826000170","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/4/20 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

Biodegradable mulch microplastics (BMPs), such as PBAT and PLA, are widely used in agriculture but can persist in soils and carry coexisting pesticides like dinotefuran (DIN). Despite its widespread use, DIN's environmental fate and microbial toxicity remain insufficiently understood. This study explores the adsorption behavior of DIN on PBAT and PLA and assesses the toxicity of MPs‑neonicotinoid complexes. To provide a more comprehensive understanding, two structurally related neonicotinoids, imidacloprid (IMI) and clothianidin (CLO), were included as comparative references. Adsorption kinetics and isotherms were measured, along with multi-scale characterization (SEM, XRD, FT-IR, XPS, contact angle). The results were integrated with Escherichia coli (E.coli) inhibition assays to assess microbial toxicity. PBAT exhibited a rougher surface with lower crystallinity (7.8% vs 17.1%), and greater hydrophobicity (contact angle 107.7° vs 92.9°) compared to PLA. This increased hydrophobicity likely contributed to the higher adsorption capacity of PBAT for DIN, as confirmed by Langmuir isotherm fitting (Q_m ≈ 15.2 mg·kg⁻¹ for PBAT vs Q_m ≈ 4.69 mg·kg⁻¹ for PLA). FT-IR/XPS indicated hydrogen-bonding/dipole interactions acting cooperatively with hydrophobic association. Increasing CaCl₂ (0–0.1 mol·L⁻¹) enhanced adsorption while NaCl produced a biphasic response, that is low-level promotion, mid-high suppression. MPs-DIN mixtures more strongly inhibited E.coli than single exposures. These results identify BMPs as potential vectors of neonicotinoids and highlight polymer chemistry and environmental modulators in co-exposure risk assessments.

Abstract Image

查看原文本刊更多论文

可生物降解PBAT和PLA微塑料对呋喃的差异吸附及其对大肠杆菌的传播风险

可生物降解的地膜微塑料（BMPs），如PBAT和PLA，广泛用于农业，但可以在土壤中持续存在，并携带共存的杀虫剂，如呋喃（DIN）。尽管它被广泛使用，DIN的环境命运和微生物毒性仍然没有得到充分的了解。本研究探讨了DIN在PBAT和PLA上的吸附行为，并评估了MPs -新烟碱复合物的毒性。为了提供更全面的认识，我们选取了两种结构相关的新烟碱类，吡虫啉（IMI）和噻虫胺（CLO）作为比较参考。测定了吸附动力学和等温线，并进行了多尺度表征（SEM， XRD, FT-IR， XPS，接触角）。结果与大肠杆菌（E.coli）抑制试验相结合，以评估微生物毒性。PBAT表面较粗糙，结晶度较低（7.8% vs 17.1%），疏水性较好（接触角107.7°vs 92.9°）。Langmuir等温线拟合（PBAT的Qm≈15.2 mg·kg−1 vs PLA的Qm≈4.69 mg·kg−1）证实，这种疏水性的增加可能有助于PBAT对DIN的更高吸附能力。FT-IR/XPS表明氢键/偶极相互作用与疏水缔合协同作用。增加CaCl2 （0 ~ 0.1 mol·L−1）可增强吸附，而NaCl则产生低水平促进、中高抑制的双相反应。MPs-DIN混合物比单独暴露对大肠杆菌的抑制作用更强。这些结果确定了bmp是新烟碱类杀虫剂的潜在载体，并强调了聚合物化学和环境调节剂在共暴露风险评估中的作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

NanoImpact Social Sciences-Safety Research

CiteScore

11.00

自引率

6.10%

发文量

审稿时长

23 days

期刊介绍： NanoImpact is a multidisciplinary journal that focuses on nanosafety research and areas related to the impacts of manufactured nanomaterials on human and environmental systems and the behavior of nanomaterials in these systems.