4. Conclusion
In summary, we have reported a simple method for the fabrication
of activated carbon/Fe3O4 nanoparticle composites via a modified
impregnation method employing HNO3 as the carbon
modifying agent. The obtained composites contained Fe3O4 nanoparticles
inside the pores of activated carbon. These exhibited a
high specific surface area and porosity and a superparamagnetic
property that allows them to be easily manipulated by an external
magnetic field. The composites still retain a good resistance over
the pH range 5–11. Due to the presence of the Fe3O4 nanoparticles,
the composites can be easily regenerated by hydrogen peroxide
and can be used repeatedly. Therefore, from practical point of view,
the activated carbon/Fe3O4 nanoparticle composite material
should be a promising adsorbent–catalyst for removal of organic
compounds from wastewater