In:
Environmental Science: Nano, Royal Society of Chemistry (RSC), Vol. 10, No. 9 ( 2023), p. 2566-2577
Abstract:
Marine micro/nanoplastic (MNP) contamination has evolved into a serious threat to the ecosystem. Unfortunately, MNPs can act as vectors for heavy metals ( e.g. , Pb( ii )), which can exacerbate their ecotoxicological effects. The development of MNPs removal methods, as well as, MNP surface clean-up strategies is, therefore, crucial to remediating marine MNP pollution. Herein, we report a magnetic “nano-fishnet” ( i.e. , alkylated nanoscale zerovalent iron grown on naturally derived cellulose nanofibers (ac-nZVI)) to quickly enrich and trap MNPs from seawater. Driven by the attractive electrostatic and hydrophobic interactions of ac-ZVI, the removal efficiency of 100 nm, 2 μm and 10 μm MNPs (PS, PVC, PMMA) from artificial seawater (ASW) has been shown to reach 98.28%, 98.58% and 97.64% within 1 min, with the calculated collection capability of 40.96, 167.62 and 324.88 mg MNPs g Fe −1 , respectively. Similarly, its rapid and complete removal performance has also been demonstrated in MNP-spiked natural seawater. Furthermore, the microscopic reaction behaviors between ac-nZVI and MNPs with different sizes are unraveled; the mechanism involves the encapsulation of single plastic spheres, adhesion of multiple particles and trapping of larger aggregates. After the reaction, the MNPs are packaged and removed using a magnet. Moreover, the unique core–shell structure endows the iron nanoparticles with rich aquatic chemistry properties for Pb( ii ) transformation and detoxification. The full contact between ac-nZVI and MNPs facilitates the reduction reactions between Fe 0 and Pb( ii ); thus, Pb( ii ) on the MNP surface is reduced to Pb 0 . Our work suggests an appealing strategy for the remediation of MNP-polluted seawater and proposes a new concept for the toxin decontamination of MNPs.
Type of Medium:
Online Resource
ISSN:
2051-8153
,
2051-8161
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2758235-8
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