Fe3O4 Magnetic Cores Coated
with Metal–Organic Framework Shells as Collectable Composite
Nanoparticle Vehicles for Sustained Release of the Pesticide Imidacloprid
posted on 2021-05-26, 06:44authored byWenyan Meng, Yiyun Gao, Zhenfen Tian, Weijie Xu, Jiagao Cheng, Shengke Li, Aihua Zou
A magnetic metal–organic framework
nanocomposite as a collectable
pesticide delivery vehicle was developed through the incorporation
of UiO-66 with polydopamine-coated Fe3O4 (Fe3O4@PDA@UiO-66). The obtained Fe3O4@PDA@UiO-66 nanocomposite was verified by X-ray diffraction,
Fourier transform infrared spectroscopy, transmission electron microscopy,
and zeta potential test. The magnetic collectability of Fe3O4@PDA@UiO-66 was demonstrated through a magnetic hysteresis
loop study (∼2 emu/g) and magnetic collection experiment (up
to a 96% collection rate). Imidacloprid (IMI) was employed as a model
pesticide to be loaded into the Fe3O4@PDA@UiO-66
nanocomposite, with 15.87% drug loading. IMI was found to exhibit
sustained-release behavior after being loaded into the delivery vehicle,
and magnetic Fe3O4@PDA@UiO-66 can be readily
collected after IMI release, which is beneficial to constrain the
hazardous effects of the vehicles and the residual pesticide on the
ecosystem. The insecticidal activity of IMI@Fe3O4@PDA@UiO-66 toward Aphis craccivora Koch was found to be superior to that of free IMI, and the efficacy
was comparable to that of the commercial 70% IMI water dispersible
granule, indicating its potential as a magnetic collectable green
carrier for pesticides in agriculture.