Adsorption behavior of commercial biodegradable plastics towards pollutants during the biodegradation process: Taking starch-based biodegradable microplastics, oxytetracycline and Cu (II) as examples

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2024-12-15 DOI:10.1016/j.envpol.2024.125538

Liuyu Chen, Ying Sun, Xuejiang Wang, Siqing Xia, Jianfu Zhao

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Abstract

With the widespread use of biodegradable plastic bags, their potential environmental risks need further assessment. This study focused on commercial starch-based blended biodegradable microplastics (70% Poly(butylene adipate-co-terephthalate) (PBAT)+5% Poly(lactic acid) (PLA)+20% Thermoplastic starch (TPS), PPT MPs) to investigate their adsorption behaviors towards Cu(II) and oxytetracycline (OTC) under microbial colonization and biodegradation. Post-biodegradation, the hydroxyl (–OH) peak intensity of starch in PPT significantly decreased, while carbonyl (C=O) peaks of PBAT and PLA broadened, with O/C ratio rising from 14.65% to 35.82%. The starch’s degradation in PPT altered its thermal properties. Microbial colonization on PPT (B-PPT) enhanced Cu(II) and OTC adsorption, while biodegradation (D-PPT) reduced their adsorption. Reduced surface carbonyl and hydroxyl groups, alongside increased crystallinity, diminished D-PPT’s Cu(II) adsorption. While OTC adsorption, driven by hydrophobic partitioning, was less affected by biodegradation. In the binary pollutant system, the Cu(II) and OTC adsorption of D-PPT increased by 20.27% and 8.63 times, respectively; B-PPT showed decreased adsorption of both. Coexisting organic matter and pH significantly affected PPT’s adsorption behavior by altering Cu(II) and OTC speciation, and influencing adsorption competition, hydrogen bonding and bridging effects. This study is the first to explore biodegradation impacts of commercial starch-based microplastics on typical heavy metals and antibiotics adsorption, providing important theoretical insights for understanding their environmental risks.

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商用生物降解塑料在生物降解过程中对污染物的吸附行为：以淀粉基生物可降解微塑料、土霉素和铜（II）为例

随着生物降解塑料袋的广泛使用，其潜在的环境风险需要进一步评估。本研究以商用淀粉基混合生物可降解微塑料（70%聚己二酸丁二醇酯（PBAT）+5%聚乳酸（PLA）+20%热塑性淀粉（TPS），PPT MPs）为研究对象，考察其在微生物定植和生物降解条件下对Cu(II)和土霉素（OTC）的吸附行为。生物降解后，PPT 中淀粉的羟基（-OH）峰强度明显降低，而 PBAT 和 PLA 的羰基（C=O）峰强度增宽，O/C 比从 14.65% 上升到 35.82%。淀粉在 PPT 中的降解改变了其热性能。微生物在 PPT（B-PPT）上的定殖增强了对 Cu（II）和 OTC 的吸附，而生物降解（D-PPT）则降低了对它们的吸附。表面羰基和羟基的减少以及结晶度的增加削弱了 D-PPT 对铜（II）的吸附。而由疏水分配驱动的 OTC 吸附受生物降解的影响较小。在二元污染物体系中，D-PPT 对 Cu(II) 和 OTC 的吸附量分别增加了 20.27% 和 8.63 倍；B-PPT 对两者的吸附量都有所下降。共存有机物和 pH 显著影响了 PPT 的吸附行为，改变了 Cu(II) 和 OTC 的种类，影响了吸附竞争、氢键和架桥效应。这项研究首次探讨了商用淀粉基微塑料对典型重金属和抗生素吸附的生物降解影响，为了解其环境风险提供了重要的理论依据。

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.