Kinetics of photocatalytic degradation of reactive black B using core-shell TiO2-coated magnetic nanoparticle, Fe3O4@SiO2@TiO2

In particular, the inappropriate/inevitably discharge of dye-containing effluents is undesirable because of their color, resistant to the biological treatment systems, toxic, and their carcinogenic or mutagenic nature to life forms. About fifty percent of the washing dye liquor is discharged into the water environment. Fe3O4@SiO2@TiO2 nanoparticles, were prepared, characterized and tested as photocatalyst in the removal of Reactive Black B (RBB) dye by a photocatalytic process. The effect of photocatalyst concentration, pH and temperature in the photodegradation kinetics is discussed in terms of the Langmuir–Hinshelwood (L-H) model. SEM and TEM characterizations confirmed the Fe3O4@SiO2@TiO2 nanoparticel, revealed that the obtained particles a spherical morphology with sizes about 100 nm. The DRS pattern of Fe3O4@SiO2@TiO2 shows the energy band gap value of photocatalyst is 2.75 eV. The presence of Fe3O4, SiO2 and anatase TiO2 in the as-synthesis magnetic nanoparticle were confirmed by FTIR and XRD analysis. The Fe3O4@SiO2@TiO2 photocatalyst in combination with ultraviolet irradiation and under optimal conditions can destroy 100% of RBB after 120 min. Furthermore, the magnetic photocatalyst was efficiently separated from the solution with the help of a magnet and shown the capable of reusability up to 10 times without reducing their efficiency.