Synthesis
Synthesis of magnetic nano-Fe3O4 sorbent
The magnetic nano-iron oxide was first synthesized according
to a previously reported method [2]. A 6.1 g sample of FeCl36H2O
and 4.2 g FeSO47H2O were dissolved in 100 mL of distilled water.
A total of 25.0 mL of 6.5 M-NaOH was slowly added to the above
solution. The reaction mixture was stirred for 4 h using a magneticstirrer. After the complete addition of NaOH, the formed black
precipitate, nano-Fe3O4, was then washed several times with
distilled water, collected in a pure form by the assistance of an
external magnetic field and dried in an oven at 70 8C.