Synergistic Excited State involved Catalytic Reduction of (NH3-trz)[Fe(dipic)2] Complex by SnO2/TiO2 Nanocomposite

The photocatalytic activity of well-fabricated, economical SnO 2 /TiO 2 nanocomposite synthesized via hydrothermal route was validated using the (NH 3 -trz)[Fe(dipic) 2 ] complex under ultra-violet illumination. The structural features of (NH 3 -trz)[Fe(dipic) 2 ] complex was explored in detail. The catalysts were systematically examined with XRD, SEM, FT-IR UV-vis, PL, micro-Raman, VSM, AFM, HRTEM. The photoreactivity of the model compound (NH 3 -trz)[Fe(dipic) 2 ] in water/binary solvent systems was investigated. The rate of photoreaction ( k ) of nanocomposite (0.1432 sec -1 ) is higher than the SnO 2 (0.0373 sec -1 ) and TiO 2 (0.1422 sec -1 ) in H 2 O:Pr i OH (70:30%) than the rest of the solvents system. The pathways, mechanistic feature of accumulated reactive species on nanocomposite to induce adherent [Fe(dipic) 2 ] - anion and photo-reductive products were studied. The generation of hydroxyl radical on the surface of each catalyst can be identified as 7-hydroxycoumarin and discussed.