Enhanced Adsorption of Cadmium onto Microplastics Derived from Polyethylene Mulching Film by Weathering

IF 3.8 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Water, Air, & Soil Pollution Pub Date : 2024-11-20 DOI:10.1007/s11270-024-07650-z

Lu Wang, Ruichang Zhang, Shufa Zhu, Jing Li, Xinquan Zhou, Ning Zhang, Shuge Peng, Xuefeng Wei

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引用次数: 0

Abstract

The interaction between microplastics (MPs) and heavy metals would significantly determine their environmental impacts. The aim of this study was to investigate the influences of weathering on the affinity of MPs derived from polyethylene mulching film towards Cd(II). Weathered (w-PEMP) and pristine MPs (p-PEMP) were prepared from mulching film sampled from a garlic planting field and the pristine one, respectively. MPs were characterized by spectrum, surface charge and hydrophobicity analysis to determine the variations in physicochemical properties during the weathering process. Batch adsorption and desorption experiments were conducted to compare the affinity of MPs towards Cd(II) before and after the weathering process. Results showed that the Pseudo-second-order dynamics model satisfactorily described the adsorption of Cd(II) onto w-PEMP, indicating the different binding sites on the surface and the main role of chemical adsorption in the interaction. According to Langmuir model, maximum adsorption capacity of w-PEMP was more than 4 times higher than that of p-PEMP, corresponding to the coarse microscopic surface and the exogenous elements and more oxygen containing groups introduced in weathering process. A higher K_f value of w-PEMP in Freundlich model suggested that the weathered microplastics surfaces had a higher adsorption affinity for the Cd(II) than p-PEMP. The weathering process also significantly increased desorption capacity of the MPs for Cd(II), and mitigated the influence of pH on the adsorption of Cd(II) onto the MPs. The weathering process markedly altered the surface morphology and physicochemical properties of MPs, and significantly enhanced the adsorption and desorption capacity of Cd(II).

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风化作用增强了聚乙烯覆盖膜微塑料对镉的吸附能力

微塑料（MPs）与重金属之间的相互作用将在很大程度上决定其对环境的影响。本研究旨在探讨风化对从聚乙烯地膜中提取的微塑料对镉（II）的亲和力的影响。研究人员分别从大蒜种植地的地膜和原始地膜中取样，制备了风化多孔质（w-PEMP）和原始多孔质（p-PEMP）。通过光谱、表面电荷和疏水性分析对 MPs 进行表征，以确定风化过程中物理化学性质的变化。进行了批量吸附和解吸实验，以比较风化过程前后 MPs 对 Cd（II）的亲和力。结果表明，伪二阶动力学模型对 Cd（II）在 w-PEMP 上的吸附有满意的描述，表明其表面有不同的结合位点，化学吸附在相互作用中起主要作用。根据 Langmuir 模型，w-PEMP 的最大吸附容量是 p-PEMP 的 4 倍以上，这与其粗糙的微观表面以及风化过程中引入的外源元素和更多含氧基团有关。在 Freundlich 模型中，w-PEMP 的 Kf 值较高，这表明风化后的微塑料表面对镉(II)的吸附亲和力高于 p-PEMP。风化过程还大大提高了微塑料对镉(II)的解吸能力，并减轻了 pH 值对微塑料吸附镉(II)的影响。风化过程明显改变了 MPs 的表面形态和理化性质，并显著提高了对 Cd（II）的吸附和解吸能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.