超顺磁性
环境修复
废物管理
地下水修复
化学工程
环境科学
化学
工程类
污染
生态学
物理
磁化
量子力学
磁场
生物
作者
Xiangnan Zhang,Jie Ding,Li Zheng,Junhan Dai,Na Li,Hongbo Li
标识
DOI:10.1016/j.seppur.2024.128069
摘要
Nanoplastics (NPs) pollution has emerged as an increasing global concern due to their widespread presence in aquatic environments and potential harm to organisms. As a result, there is an urgent demand for the development of efficient strategies to remove NPs from water. In this study, a surface-functionalized superparamagnetic absorbent was designed for the rapid removal of NPs. The absorbent consists of a superparamagnetic core (Fe3O4) and a carbon shell, where the carbon surface is functionalized through positively charged imidazole groups and alkyl chain groups. This innovative design greatly improves the material's stability and facilitates efficient absorption and agglomeration of NPs. The developed absorbent exhibits a significantly higher maximum absorption capacity of 992 mg/g for PS NPs compared to other functionalized carbon materials. The absorption mechanism, as well as the effects of pH and ions on removal efficiency, were thoroughly investigated. The absorbent exhibits rapid and high absorption capabilities, the ability to be magnetically recycled, and excellent removal efficiency across a wide pH range, indicating its potential for effectively removing NPs from waters. This research provides a highly efficient method for NPs removal in water and invaluable insights into designing functional absorbents for water purification.
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