preparation of hollow tio_2 nano-spheres, zno and fe_2o_3 in sunscreens to absorb harmful ultra violet rays

For preparation of an effective sunscreens three nanoparticles were added to the matrix for suitable improving of sun absorption. in this study, different types of hollow tio_2, zno, fe_2o_3 were synthesized by so-lgel method. to prepare tio_2 nanoparticles, tetra isopropoxide (ttip) was used as a precursor and methanol as a solvent and its photocatalytic properties were investigated. colorants and industrial wastewater were used to study photocatalytic properties of pure titanium dioxide, zinc oxide and iron oxide. the prepared products were characterized by xray diffraction (xrd), scanning electron microscopy (sem), and fourier transform infrared (ftir) spectroscopy and uvvis absorption. all the synthesized products were used for preparation of sunscreen cream composite.