Enhanced solar photocatalytic reduction of hexavalent chromium in seawater over carbon doped TiO2 nanoparticles

الملخص EN

The photocatalytic removal of hexavalent chromium Cr (VI) from polluted seawater has been successfully investigated by using carbon doped titanium oxide (CTiO2) nanoparticles under irradiation of natural sunlight.

The photoactivity of CTiO2 was comparatively evaluated with pure TiO2 under the same experimental conditions.

The effects of catalyst dose, initial Cr (VI) concentration and pH were studied and optimized.

The highest removal rate was obtained at pH 3 and catalyst dose of 2.0 g L-1.

Furthermore, the existence of hole scavenger remarkably enhanced the reduction rate of Cr( VI).

According to Langmuir–Hinshelwood model, the photocatalytic reduction of Cr (VI) using CTiO2 obeyed the pseudo-first-order kinetics