School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China.
School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009, China.
Mar Pollut Bull. 2018 Nov;136:516-523. doi: 10.1016/j.marpolbul.2018.09.048. Epub 2018 Oct 2.
The aim of the present study was to evaluate the sorption and desorption of sulfamethoxazole (SMX), propranolol (PRP) and sertraline (SER) by polyethylene (PE) microplastics in water. After the 96 h mixture, the sorption percentages of pharmaceuticals on PE microplastics decreased according to the following order: SER (28.61%) > PRP (21.61%) > SMX (15.31%). The sorption kinetics were fitted well with the pseudo-second-order model. Both linear and Freundlich models were able to describe the sorption isotherm. The results suggest that the sorption process of the pharmaceuticals may be adequately described by their hydrophobicity and electrostatic interactions. The desorption results showed that 8% and 4% of PRP and SER, respectively, were released from the microplastics within 48 h, but the sorption of SMX was irreversible. The results indicate the potential risks of PRP and SER for bioaccumulation in aquatic organisms via ingestion of the microplastics in aquatic environments.
本研究旨在评估聚乙烯（PE）微塑料在水中对磺胺甲恶唑（SMX）、普萘洛尔（PRP）和舍曲林（SER）的吸附和解吸作用。在 96 小时的混合后，药物在 PE 微塑料上的吸附百分比按以下顺序降低：SER（28.61%）>PRP（21.61%）>SMX（15.31%）。吸附动力学很好地符合伪二级模型。线性和 Freundlich 模型都能够描述吸附等温线。结果表明，药物的吸附过程可以通过其疏水性和静电相互作用来充分描述。解吸结果表明，在 48 小时内，分别有 8%和 4%的 PRP 和 SER 从微塑料中释放出来，但 SMX 的吸附是不可逆的。结果表明，PRP 和 SER 通过在水生环境中摄入微塑料，存在在水生生物中生物累积的潜在风险。
