{"title":"Adsorption properties and influencing factors of antibiotics on microplastics under simulated gastric fluid environment.","authors":"Jie Jiang, Jiaqian Zhang, Boyan Liu, Yuelin Huang, Hecheng Bai, Meng Zhang, Xinpei Li, Meng Xu, Yanxiao Jiang","doi":"10.1007/s10653-025-02573-y","DOIUrl":null,"url":null,"abstract":"<p><p>Microplastics (MPs) and antibiotics (ATs) are emerging pollutants. Recent studies have confirmed that MPs can act as carriers for toxic pollutants, releasing and accumulating these substances within organisms upon ingestion. Additionally, MPs undergo aging processes within organisms, affecting their ability to adsorb pollutants. This study investigated the adsorption behavior of three aged MPs including polypropylene (PP), polylactic acid (PLA) and polystyrene (PS) for typical ATs in a simulated human gastric fluid environment. The results indicated that the adsorption capacity of MPs for ATs decreases slightly with increasing pH and significantly with higher ionic strength. Smaller particle sizes exhibited higher adsorption capacities. MPs aged in simulated gastric fluid exhibited significantly greater adsorption capacities than their original counterparts. Among the four antibiotics tested, amoxicillin (AMX), ciprofloxacin (CIP), levofloxacin (LEV), and sulfadiazine (SD), the three microplastics exhibited the highest adsorption capacity for AMX. The adsorption capacities were determined as follows: PP-AMX (1.65 mg g<sup>-1</sup>), PLA-AMX (1.47 mg g<sup>-1</sup>), and PS-AMX (1.48 mg g<sup>-1</sup>). Furthermore, the adsorption of ATs on aged MPs followed a pseudo-second-order model, and isotherm analysis aligned with the Freundlich model, suggesting a non-uniform, multilayer surface adsorption process. These findings deepen the understanding of interactions between aged MPs and ATs in the human gastric fluid environment and provide crucial information for ecological risk assessments of MPs.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"47 7","pages":"264"},"PeriodicalIF":3.2000,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Geochemistry and Health","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s10653-025-02573-y","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
Microplastics (MPs) and antibiotics (ATs) are emerging pollutants. Recent studies have confirmed that MPs can act as carriers for toxic pollutants, releasing and accumulating these substances within organisms upon ingestion. Additionally, MPs undergo aging processes within organisms, affecting their ability to adsorb pollutants. This study investigated the adsorption behavior of three aged MPs including polypropylene (PP), polylactic acid (PLA) and polystyrene (PS) for typical ATs in a simulated human gastric fluid environment. The results indicated that the adsorption capacity of MPs for ATs decreases slightly with increasing pH and significantly with higher ionic strength. Smaller particle sizes exhibited higher adsorption capacities. MPs aged in simulated gastric fluid exhibited significantly greater adsorption capacities than their original counterparts. Among the four antibiotics tested, amoxicillin (AMX), ciprofloxacin (CIP), levofloxacin (LEV), and sulfadiazine (SD), the three microplastics exhibited the highest adsorption capacity for AMX. The adsorption capacities were determined as follows: PP-AMX (1.65 mg g-1), PLA-AMX (1.47 mg g-1), and PS-AMX (1.48 mg g-1). Furthermore, the adsorption of ATs on aged MPs followed a pseudo-second-order model, and isotherm analysis aligned with the Freundlich model, suggesting a non-uniform, multilayer surface adsorption process. These findings deepen the understanding of interactions between aged MPs and ATs in the human gastric fluid environment and provide crucial information for ecological risk assessments of MPs.
期刊介绍：
Environmental Geochemistry and Health publishes original research papers and review papers across the broad field of environmental geochemistry. Environmental geochemistry and health establishes and explains links between the natural or disturbed chemical composition of the earth’s surface and the health of plants, animals and people.
Beneficial elements regulate or promote enzymatic and hormonal activity whereas other elements may be toxic. Bedrock geochemistry controls the composition of soil and hence that of water and vegetation. Environmental issues, such as pollution, arising from the extraction and use of mineral resources, are discussed. The effects of contaminants introduced into the earth’s geochemical systems are examined. Geochemical surveys of soil, water and plants show how major and trace elements are distributed geographically. Associated epidemiological studies reveal the possibility of causal links between the natural or disturbed geochemical environment and disease. Experimental research illuminates the nature or consequences of natural or disturbed geochemical processes.
The journal particularly welcomes novel research linking environmental geochemistry and health issues on such topics as: heavy metals (including mercury), persistent organic pollutants (POPs), and mixed chemicals emitted through human activities, such as uncontrolled recycling of electronic-waste; waste recycling; surface-atmospheric interaction processes (natural and anthropogenic emissions, vertical transport, deposition, and physical-chemical interaction) of gases and aerosols; phytoremediation/restoration of contaminated sites; food contamination and safety; environmental effects of medicines; effects and toxicity of mixed pollutants; speciation of heavy metals/metalloids; effects of mining; disturbed geochemistry from human behavior, natural or man-made hazards; particle and nanoparticle toxicology; risk and the vulnerability of populations, etc.
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