Synthesis, Characterization and Application of Magnetic Nanoparticles for the Photodegradation of Tartrazine Yellow Dye

Resumo

Iron oxide magnetic nanoparticles (MNps) stabilized in the poly(diallyldimethylammonium) chloride
(PDAC) polymer were employed to increase the photodegradation of tartrazine yellow dye. MNps
stabilized in the PDAC matrix formed the MNp-PDAC nanohybrid, with a medium diameter of 22 nm.
A solution efficiency of 30% was obtained in the dye degradation without the nanohybrid, which
increased to 96% with MNps, after 120 minutes. This greater dye removal efficiency in the presence of
MNps was attributed to adsorption due to electrostatic interaction of the PDAC’s positive site and the
negative charge of tartrazine yellow dye, which brings the azo group of the dye closer to the surface of
the nanohybrid. The kinetic parameters obtained from the Langmuir-Hinshelwood linearization for this
photodegradation system confirmed the efficiency of the photocatalyst in removing the dye from the
solution used in this work.