Removal of microplastics from water by magnetic nano-Fe3O4

微塑料 海水 聚丙烯 聚乙烯 聚苯乙烯 污水 材料科学 聚对苯二甲酸乙二醇酯 聚合物 污染 环境科学 环境化学 制浆造纸工业 环境工程 化学 复合材料 生态学 生物 工程类
作者
Xiahong Shi,Xiaoting Zhang,Wei Gao,Yalin Zhang,Defu He
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:802: 149838-149838 被引量:184
标识
DOI:10.1016/j.scitotenv.2021.149838
摘要

Microplastics (MPs) have been widely detected in aquatic environments, and become emerging contaminants of growing concern. It is urgently needed to explore how to effectively remove MPs from water. This study first established an alternative method of removing MPs by magnetic nano-Fe3O4. Results showed that 1.3 g·L−1 nano-Fe3O4 and 150 min treatments caused optimal magnetization of MPs via surface absorption. Then, magnetized MPs in water can be conveniently removed by suction of the magnet. The average removal rate of four common types of MPs including polyethylene, polypropylene, polystyrene and polyethylene terephthalate in size of approximately 200–900 μm was 86.87 ± 6.92%, 85.05 ± 4.70%, 86.11 ± 6.21%, and 62.83 ± 8.34%, respectively. The removal rate varied among polymer- and size-different MPs, and was positively related to the density of nano-Fe3O4 absorbed on MP surfaces. In addition, the removal rate of MPs in artificial seawater was relatively high in comparison to pure water. Furthermore, the established approach was effectively applied to remove MPs in environmental water bodies including river water, domestic sewage, and natural seawater, with the removal rate of higher than 80%. Altogether, this study provided a novel and simple removal approach to remove MPs in water, which has a certain application prospect.
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