Synthesis of thermoresponsive copolymer/silica‐coated magnetite nanoparticle composite and its application for heavy metal ion recovery
Synthesis of thermoresponsive copolymer/silica‐coated magnetite nanoparticle composite and its application for heavy metal ion recovery
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DOI：
10.1002/app.50303
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发表时间：
2020-12
影响因子：
3
通讯作者：
Hitoshi Tomonaga;K. Hayashi;T. Matsuyama;J. Ida
中科院分区：
文献类型：
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作者：
Hitoshi Tomonaga;K. Hayashi;T. Matsuyama;J. Ida
为了提高磁性纳米粒子(MNPs)的化学稳定性和抑制团聚，将磁性纳米粒子作为热响应性共聚物固定化的载体，采用电氧化的方法对MNPs进行二氧化硅包覆。虽然所得到的二氧化硅包覆的MNPs也形成了聚集体，但聚集体的尺寸分布向较小的尺寸范围移动。因此，与未包覆的MNPs相比，可用于固定化共聚物的表面积最大增加了约6.7倍。这有助于增加二氧化硅包覆的MNPs上的固定化共聚物的量，大约是未包覆的MNPs的4倍。Fe3O4溶解实验证实了MNPs化学稳定性的提高。固定在二氧化硅包覆的MNPs上的热响应性共聚物具有通过改变温度从含铜(II)溶液中回收铜(II)离子的能力，比其他凝胶形式的热响应性吸附剂的时间短得多。
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. Fe3O4dissolution 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.