Simultaneous photooxidation and photoreduction of phenol and Cr(VI) ions using titania modified with nanosilica

Abstract The photocatalytic process of phenol oxidation and Cr(VI) reduction in the presence nano-silica modified titania was carried out. activity composites tested using two different light sources. photocatalysts with 10% nanosilica showed highest activity. calcination temperature (200–800 o C) significantly determined sensitivity obtained materials to source used. Photocatalysts alternately adsorbed desorbed ions from reaction mixture during irradiation. In one-component mixture, complete observed material calcined at 650 C, after 3 h UV-VIS phenol, demonstrated by photocatalyst 300 C. concentration decreased proportion decrease chromium ions. titania-silica oxidizing properties towards reductive toward