微塑料(MPs)和药品和个人护理产品(PPCPs)是全球水生生态系统中广泛存在的两种新兴污染物。与这两种污染物共存相关的生态风险已引起研究人员的越来越多的关注。在这项研究中,我们选择了15种典型的亲水性PPCPs,包括磺酰胺(SA),甲砜霉素,氟苯尼考,氯霉素(CHL),氨苄青霉素,头孢氨苄,氧氟沙星,氟尿嘧啶,苯妥英,茶碱,西咪替丁,对羟基苯甲酸甲酯,二乙基甲苯酰胺,二苯甲酮-2(BP-2),和二苯甲酮-4,作为吸附物。我们评估了五种传统塑料(TP)的吸附潜力,即聚酰胺6(PA6),聚苯乙烯(PS),聚对苯二甲酸乙二醇酯(PET),聚氯乙烯(PVC),和聚氨酯(TPU),以及三种生物降解塑料(BDP),包括聚乳酸(PLA),聚丁二酸丁二醇酯(PBS),和聚(ε-己内酯)(PCL),这些吸附物。在测试的120种MP和PPCP组合中,只有24个表现出显著的吸附行为。值得注意的是,三种BDP的吸附性能强于三种典型的TP(PS,PET,和PVC)。根据它们的吸附潜力,PA6,BDP,苯妥英,和BP-2被确定为高生态风险的潜在来源。为进一步探讨吸附机理,我们研究了SA的吸附行为,BP-2和CHL对PA6。结论如下:SA,BP-2和CHL均在24h内达到吸附平衡,分配系数(Kd)的顺序如下:BP-2(8.051),SA(0.052)>CHL(0.018)。吸附的主要力量是静电相互作用,分子间氢键,和疏水相互作用,分别。此外,在CHL和BP-2的吸附中观察到弱的静电效应。pH的影响,离子强度,和富里酸对吸附能力不同。这些结果强调了水环境中MPs和亲水性污染物之间的复杂吸附机制。本研究为进一步评价MPs和PPCPs复合污染的生态风险提供了依据。
Microplastics (MPs) and pharmaceuticals and personal care products (PPCPs) are two types of emerging contaminants widely present in the global aquatic ecosystem. The ecological risks associated with the coexistence of these two contaminants have garnered increasing attention from researchers. In this study, we selected 15 typical hydrophilic PPCPs, including Sulfacetamide (SA), Thiamphenicol, Florfenicol, Chloramphenicol (CHL), Ampicillin, Cephalexin, Ofloxacin, Fluorouracil,
Phenytoin, Theophylline, Cimetidine, Methylparaben, Diethyltoluamide, Benzophenone-2 (BP-2), and Benzophenone-4, as adsorbates. We evaluated the adsorption potential of five traditional plastics (TPs), namely Polyamide 6 (PA6), Polystyrene (PS), Polyethylene terephthalate (PET), Polyvinyl chloride (PVC), and Polyurethane (TPU), as well as three biodegradable plastics (BDPs), including Polylactic acid (PLA), Polybutylene succinate (PBS), and Poly (ε-caprolactone) (PCL), for these adsorbates. Out of the 120 combinations of MPs and PPCPs tested, only 24 exhibited significant adsorption behavior. Notably, the adsorption performance of the three BDPs was stronger than that of the three typical TPs (PS, PET, and PVC). Based on their adsorption potential, PA6, BDPs,
phenytoin, and BP-2 were identified as potential sources of high ecological risk. To further explore the adsorption mechanism, we investigated the adsorption behaviors of SA, BP-2, and CHL on PA6. The conclusions were as follows: SA, BP-2, and CHL all reached adsorption equilibrium within 24 h, with the partition coefficient (Kd) following this order: BP-2 (8.051) ≫ SA (0.052) > CHL (0.018). The primary forces of adsorption were electrostatic interactions, intermolecular hydrogen bonding, and hydrophobic interaction, respectively. Additionally, weak electrostatic effects were observed in the adsorption of CHL and BP-2. The effects of pH, ionic strength, and fulvic acid on adsorption capacity varied. These results highlight a complex adsorption mechanism between MPs and hydrophilic contaminants in the aquatic environment. This study provides a basis for further evaluating the ecological risks of MPs and PPCPs combined pollution.