The degradation of NB from aqueous solution under UV-VIS irradiation using heavy metal doped titania was investigated. If iron dopant is often and widely used, other transitional metals, such as cobalt and nickel, have been sparsely studied. The application of sol-gal Fe, Co or Ni-doped TiO2 nanopowders in the nitrobenzene degradation from water is not mentioned transitional literature.