The magnetite nanoparticles (Fe₃O₄ NPs) were synthesized by co-precipitation of ferric and ferrous salts in alkaline medium. Fe₃O₄ NPs were surface modified with Bisphenol A diglycidyl ether epoxy resin (BADGE) and Algal organisms namely, Sargassum dentifolium and Ulva fasciata. The surface functional groups were characterized by Fourier transforms infrared spectra (FT-IR), Transmission electron microscope (TEM) and X-ray diffraction (XRD) spectroscopy. Optical properties, including particle sizes in both dispersion form and dried state, particle morphology as well as magnetic property, were evaluated by TEM observation. The particle size of individual nanoparticles (crystals) was about ⩽18 nm and ⩽ 20.33 nm. Chromatography method for removal of Polycyclic Aromatic Hydrocarbons (PAHs) is discussed in this work. In addition to classic methods of PAHs removal, the “nano”-techniques are being currently developed, which use nano zero-valent iron (nZVI). It can be seen that the prepared nanocomposites, the magnetite nanoparticles of iorn oxide surface modified with Bisphenol A diglycidyl ether epoxy resin (BADGE) and Algal organisms, show nearly complete (over 98 %) naphthalene and anthracene removal, as a practical approach for wastewaters treatment. It has been demonstrated that cis-naphthalene dihydrodiol dehydrogenase oxidizes cis-dihydrodiols of other polycyclic aromatic hydrocarbons. Generally these studies suggest that smaller particles are more toxic than larger ones, although large differences among different particle types exist. It is thus impossible to simply extrapolate toxicity data from bulk material to nanoparticles. The superior performance of nanomaterials can be attributed to their increased surface area and, in turn, higher reactivity as well as the possibility of in situ treatment for waste treatment.

Keywords: Nanotechnology, Polymeric Core/Shell nanostructures, Bisphenol A diglycidyl ether epoxy resin, Iorn oxide, Sargassum dentifolium, Ulva fasciata.