Abstract:

Gadolinium-doped TiO2/activated carbon fibre composite(TG/ACF) was prepared from TiCl4 and Gd(NO3)3·6H2O by acid-catalyzed hydrolysis method, then it was loaded on active carbon fiber(ACF) surface by impregnation. The photocatalytic activity was evaluated by degradation of gaseous benzene. XRD, FTIR and GC-MS were used to characterize the obtained composite. The results showed that Gd-doping could inhibit the growth of TiO2 crystallite. The photocatalytic activity of gadolinium-doped TiO2/ACF was affected by the added amount of Gd and dip-coating times. When the mass fraction of doped-gadolinium was 0.48% and dip-coating for 2 times, the composite exhibited the highest photocatalytic activity for benzene removal. No quinine compound was detected on gadolinium-doped TiO2/ACF composite surface after photocatalytic oxidation of benzene. The doped-Gd could slow down the deactivation of the catalyst, and the catalyst remained high activity after 100 min of usage.

Key words: Titanium Dioxide, Activated Carbon Fibre, Gadolinium-doped, Photocatalysis, Adsorption