微塑料
吸附
胶体
聚苯乙烯
化学
化学工程
环境化学
胶粒
范德瓦尔斯力
环境科学
环境工程
聚合物
有机化学
分子
工程类
作者
Xianxian Chu,Yuan Tian,Jing Liu,Jia She,Weigao Zhao,Peng Zhao
标识
DOI:10.1016/j.jhazmat.2022.129680
摘要
With microplastics (MPs) being continuously found in various environments, the pollution of water supply systems by MPs is receiving increasing attention. As the sediment in drinking water distribution systems (DWDSs), pipe scales act as the interface for complex reactions between bulk water and pipe surfaces. Consequently, the fate of MPs in pipe scales requires exploration, especially colloidal MPs. In this study, MPs were detected in different pipe scale layers, with concentrations of 0.32–3.10 items g −1 . Subsequently, the adsorption interaction mechanisms between pipe scales and colloidal polystyrene microplastics (PSMPs) were investigated through batch adsorption experiments. The findings indicated that pipe scales showed a potential adsorption capacity for PSMPs. The adsorption kinetics and isotherms results demonstrated that the PSMP adsorption process was physically dominant and complicated. van der Waals and electrostatic interactions, hydrogen bonding, and pore filling were the main adsorption mechanisms. These results verify that colloidal MPs can be adsorbed by pipe scales, demonstrating that pipe scales play an essential role in the fate of colloidal MPs in DWDSs and the quality and security of drinking water. The secondary release of MPs from pipe scales is also worthy of attention due to the environmental and health risks. • MPs existed in pipe scales. • Pipe scales showed a potential adsorption capacity for PSMPs. • The adsorption process was physically dominant and complicated. • The adsorption effect of pipe scales might influence MP distribution in DWDS.
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