Photocatalytic properties of TiO2 modified with gold nanoparticles in the degradation of oxalic acid in aqueous solution

ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

“…It is now well recognized that the photocatalytic activity of TiO 2 nanoparticles depends not only on the properties of the TiO 2 material itself, but also on the performance of the modified material [7][8][9]. A lot of researches have shown that the photocatalytic activity of TiO 2 and ZnO can be effectively improved by doping them with semiconductors such as ZnO/TiO 2 which may provide another alternative to solve the problem of fast electron-hole recombination [10][11][12][13]. A nanocomposite made of ZnO and TiO 2 seems to be useful in achieving more efficient generation of electron/hole pairs under UV illumination and also in obtaining higher reaction rates as compared to other semiconductor couples [14][15][16].…”

Enhanced photocatalytic H2 generation on noble metal modified TiO2 catalysts excited with visible light irradiation

“…These nanoparticles can readily be synthesized and precipitated from their precursors through applying chemical reducing agents [14,15]. From the aspect of cost-effectiveness, a noble metal content of 1 wt% [16][17][18] or below [5,8,19] is considered optimal and sufficient for a significant increase in photocatalytic activity. Higher quantities of noble metal particles on TiO 2 can block the active sites.…”

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

“…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].…”