Dioctyl phthalate (DOP) is characterized by a number of
comprehensive properties, such as high plasticizing efficiency, low
volatility and excellent UV-resisting [24]. Therefore, DOP was used
in solvent-free procedure to design and synthesize two novel
magnetic nano-sorbents. The first was based on surface encapsulation
of nano-Fe3O4 by DOP for the formation of nano-Fe3O4-DOP
sorbent. This magnetic nano-sorbent was further treated with
triethylenetetramine (TETA) as an example of nitrogen donors
containing sequestering reagent to produce nano-Fe3O4-DOPTETA
via also a solvent-free procedure. The produced magnetic
nano-sorbents were characterized by scanning electron micros-
copy (SEM), high resolution transmission electron microscopy
(HR-TEM), thermal gravimetric analysis (TGA), and Fourier
transform-infrared spectroscopy (FT-IR). The metal sorption
behaviors and characteristics of the newly designed magnetic
nano-sorbents as magnetic solid phase extractors were investi-
gated and explored by Ni(II), Cd(II) and Pb(II) under different
experimental controlling factors and conditions.