The Role of Inorganic Salts on the Tio² based Photocatalysis of Rodamin B (RB) in Aqueous Solutions

The photo-catalytic bleaching of industrial dyes using Tio₂ has appeared promising in laboratory studies, but little attention has been focused on whether other species might be found in wastewater have a harmful or useful effects on the photo-bleaching. This study highlights effects of some ionic species on the photo-bleaching of Rodamin B (RB) dye in the aqueous acidic and basic solutions. The rate of RB photo-catalytic oxidation was studied at different pH values. The effect of solvents on photo-degradation of RB was also investigated. Various metals doped titanium dioxide (Tio₂) photocatalysis have been studied intensively for the photodegradation of dye in wastewater treatment. The Ag particles were photodeposited on Tio₂ powder surface. Nanostructure Ag-Tio₂ nanoparticles were synthesized by photo reduction method.The X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy dispersive X-ray spectroscopy (EDXS), and photoluminescence (PL) spectrophotoscopy were applied to investigate the
structure and morphologies of the samples. It was found that the loaded Ag particles have no effect on the XRD patterns.Photodegradation capacity of Tio₂ nanoparticleswas compared to AgTio₂ photoactivity. Above the optimum silver ion loading, the activity of Ag/Tio₂ particles decreased. The use of electron acceptors, such as S₂O8^-2 in Tio₂ system increased dye photo-degradation.

Author(s): Fatemeh Maghami

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