Preparation of Fe3O4@SiO2@PLL Core-Shell Nanoparticles for Potential Application for Heavy Metal Ion Removal

Yi-han Ma, Qing-han Zhou

The Fe3O4@SiO2@PLL core-shell nanoparticles were prepared by functionalization of magnetic Fe3O4 nanoparticles with 3-amidyl trimethoxane (APTMS) and Poly(L-lysine) (PLL) as a novel sorbent for heavy metal ion removal in water. The Fe3O4@SiO2@PLL nanoparticles were prepared by a three-step process: (i) surface modification of Fe3O4 nanoparticles by APTMS to form Fe3O4@SiO2, (ii) surface functionalization of Fe3O4@SiO2 nanoparticles by ring opening polymerization to form a Fe3O4@SiO2@PZLL nanoparticles, and (iii) deprotection of PZLL to form the Fe3O4@SiO2@PLL nanoparticles. The chemical structure of the Fe3O4，Fe3O4@SiO2, Fe3O4@SiO2@PZLL, and Fe3O4@SiO2@PLL was characterized by FTIR and XRD. The nano-size, zeta-potential, and surface morphologies of the core-shell nanoparticles were analyzed by DLS and SEM. The core-shell nanoparticles will be further studied on their removal efficiency for heavy metal ions such as Cr2O72- (VI) from the aqueous medium, and the effects of different factors such as initial adsorbent concentration, adsorption time, adsorption dosage, pH, and temperature in the adsorption experiment will be furtherly studied.

https://doi.org/10.31871/IJNTR.4.10.10