Functionalisation versus mineralisation of some N-heterocyclic compounds upon UV-illumination in the presence of un-doped and iron-doped TiO2 photocatalysts

Influence of physicochemical–electronic properties of transition metal ion doped polycrystalline titania on the photocatalytic degradation of Indigo Carmine and 4-nitrophenol under UV/solar light

“…The transition metal ion doping in the titania matrix, changes the local electronic structure and induces the visible light absorption usually by introducing localized electronic states within the band gap and it also creates different surface structure that can intrinsically alter the surface transfer of charge carriers and hence the photocatalytic activity [14][15][16][17][18][19][20][21][22][23][24][25]. Despite the intensified research on metal ion doped TiO 2 , no unifying decision has been made so far, since wide variety of experimental conditions applied for photocatalyst preparation and different substrates chosen to study their activity.…”

“…However, the high degree of recombination between photogenerated charge carriers in TiO 2 and also its large band gap limits its overall photocatalytic efficiency. An intense research has been devoted in recent years to lower the threshold excitation energy in order to utilize large fraction of solar light with high efficiency by several methods which mainly includes metal ion doping [14][15][16][17][18][19][20][21][22][23][24][25], non metal ion doping [26][27][28][29][30][31][32][33][34][35], surface sensitization of TiO 2 by dyes [36][37][38] and metal complexes [39,40], coupling with narrow band gap semiconductor [41,42] and depositing noble metal on the TiO 2 surface [43,44].…”