The photodissociation of oxalyl chloride and 2,3 butanedione at 193nm and 248nm have been studied by Time resolved FTIR emission spectroscopy. The IR fluorescence emission was observed and the rotational and vibrational populations of the CO product were obtained. It is suggested that the photolysis mechanism is two RCO radicals formed via a fission of C-C bond, followed by a decomposition of the RCO intermediate to vibrationally excited CO( v ) and R radical.
The transition metal ion doped TiO 2 nanoparticles were prepared with hydrothermal method, and the effects of doping different metal ions on the ability of TiO 2 in photocatalyzing degradation of rhodamine B(RB) were studied. The results showed that the doping of Fe 3+ , Co 2+ , Ni 2+ and Cr 3+ in TiO 2 nanoparticles made the photocatalytic efficiency of the TiO 2 particles reduce and the higher the initial content of Fe 3+ , the lower the ability of TiO 2 in photocatalyzing the degradation of RB. But the doping of Zn 2+ and Cd 2+ , especially Zn 2+ , made the photocatalytic efficiency of the TiO 2 particles enhance, showing a great increase of the rate constant( k ) and the initial reaction rate( r ini ).
