Magnetic Removal of Micro- and Nanoplastics from Water-from 100 nm to 100 µm Debris Size.

Autor: Gaß H; Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany., Kloos TM; Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany., Höfling A; Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany., Müller L; Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany., Rockmann L; Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany., Schubert DW; Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany., Halik M; Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Mar; Vol. 20 (10), pp. e2305467. Date of Electronic Publication: 2023 Oct 24.
DOI: 10.1002/smll.202305467
Abstrakt: Clean water is one of the most important resources of the planet but human-made contamination with diverse pollutants increases continuously. Microplastics (<5 mm diameter) which can have severe impacts on the environment, are present worldwide. Degradation processes lead to nanoplastics (<1 µm), which are potentially even more dangerous due to their increased bioavailability. State-of-the-art wastewater treatment plants show a deficit in effectively eliminating micro- and nanoplastics (MNP) from water, particularly in the case of nanoplastics. In this work, the magnetic removal of three different MNP types across three orders of magnitude in size (100 nm-100 µm) is investigated systematically. Superparamagnetic iron oxide nanoparticles (SPIONs) tend to attract oppositely charged MNPs and form aggregates that can be easily collected by a magnet. It shows that especially the smallest fractions (100-300 nm) can be separated in ordinary high numbers (10 13  mg -1 SPION) while the highest mass is removed for MNP between 2.5 and 5 µm. The universal trend for all three types of MNP can be fitted with a derived model, which can make predictions for optimizing SPIONs for specific size ranges in the future.
(© 2023 The Authors. Small published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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