【作者】 张智昱； 杨琛；

【Author】 Zhang Zhiyu;Yang Chen;School of Environment and Energy, South China University of Technology;Key Laboratory of Industrial Pollution Control and Ecological Restoration;

【机构】 华南理工大学环境与能源学院； 工业污染控制与生态恢复重点实验室；

【摘要】 一直以来,天然沉积物中微塑料、矿物和有机污染物的共存广受关注,微塑料和有机物之间的相互作用可能会受到天然矿物的影响。因此,为了阐明天然矿物对微塑料与有机物相互作用的影响,本研究采用聚氯乙烯(PVC)微塑料、针铁矿(GOE)和一种多环芳烃衍生物(1-羟基菲)进行了一系列实验。在中性条件下(pH=7),PVC微塑料与针铁矿(设置悬浮液浓度为20、100、200mg/L)的共同作用抑制了微塑料对1-羟基菲的吸附能力。形态学表征表明,纳米针铁矿颗粒分散在PVC微塑料的表面上;Zeta电位和pH效应的结果表明,由于针铁矿与微塑料表面带电性相反,GOE占据了PVC上的部分静电吸附位点,从而降低了微塑料对1-羟基菲的吸附能力。因此,针铁矿的存在减弱了多环芳烃衍生物在微塑料表面的吸附。本研究表明,沉积环境中天然矿物的存在可以改变微塑料的表面性质,从而影响有机污染物在水-沉积物界面的积累和迁移。更多还原

【Abstract】 The coexistence of microplastics, minerals, and organic pollutants in natural sediments has long been of concern, and the interaction between microplastics and organic matter may be influenced by natural minerals. Therefore, in order to elucidate the effect of natural minerals on the interaction between microplastics and organic matter, a series of experiments were conducted using polyvinyl chloride(PVC) microplastics, goethite(GOE), and a polycyclic aromatic hydrocarbon derivative(1-hydroxyphenanthrene). Under neutral conditions(pH=7), the combined action of PVC microplastics and goethite(suspension concentrations were set at 20, 100, 200mg/L)inhibited the adsorption capacity of 1-hydroxyphenanthrene. Morphological characterization showed that nangogoethite particles dispersed on the surface of PVC microplastics. The results of Zeta potential and pH effect showed that GOE occupied part of electrostatic adsorption sites on PVC because goethite was opposite to microplastics, which reduced the adsorption capacity of microplastics to 1-hydroxyphenanthrene. Therefore, the presence of goethite weakens the adsorption of PAHs derivatives on microplastics. This study shows that the presence of natural minerals in the sedimentary environment can alter the surface properties of microplastics, thereby affecting the accumulation and migration of organic pollutants at the water-sediment interface.更多还原