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- Title
Synthesis of thermoresponsive copolymer/silica‐coated magnetite nanoparticle composite and its application for heavy metal ion recovery.
- Authors
Tomonaga, Hitoshi; Hayashi, Kodai; Matsuyama, Tatsushi; Ida, Junichi
- Abstract
To enhance chemical stability and suppress of aggregation of magnetite nanoparticles (MNPs), which are used as a support for thermoresponsive copolymer immobilization, silica coating of the MNPs is applied via the electrooxidation method. Although the resulting silica coated‐MNPs also formed aggregates, the size distribution of the aggregate shifted to smaller size range. Because of that, the surface area available for copolymer immobilization increased approximately 6.7 times at maximum as compared with that of the uncoated MNPs. It contributed to the increase of the amount of the immobilized copolymer on the silica‐coated MNPs, which is approximately four times larger than that on the uncoated MNPs. Fe3O4 dissolution test confirmed enhancement of chemical stability of MNPs. The thermoresponsive copolymer immobilized on the silica‐coated MNPs shows the ability to recycle Cu(II) ion from Cu(II) containing solution by changing temperature with significantly shorter time than those in other thermoresponsive adsorbents in gel form.
- Subjects
HEAVY metals; THERMORESPONSIVE polymers; METAL ions; MAGNETITE; CHEMICAL stability; SURFACE area; SORBENTS
- Publication
Journal of Applied Polymer Science, 2021, Vol 138, Issue 17, p1
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.50303