Titanium dioxide nanotubes were prepared by the hydrothemeral method

and characterized with TEM

XRD and BET.The anatase products

with an external diameter of 5—7 nm

a wall thickness of about 1 nm and a length of 200—300 nm

had a specific surface area of 276 m2·g-1.Their adsorption of COD

catalytic activity and reaction kinetics for ozonation in landfill leachate solution were studied.The removal rate of COD by using O3/UV/TiO2 nanotubes in 60 minutes was 20.83% better than using O3/UV/P25 (Degussa

Germany)

and 32.65% better than using O3/UV (Yingze Corp.

China).In landfill leachate solution

the maximal absorption of COD on 0.5 g TiO2 nanotubes

contributing 10.14% of the total COD removal rate

was 1.34 times as that on 0.5 g P25 at 293 K.The overall apparent rate constant of O3/UV/TiO2 nanotubes was 1.19 times as that of O3/UV/P25

and 1.80 times as that of O3/UV in 2 hours.Two equations between k and T were obtained

and the total apparent activation energy of O3/UV/TiO2 nanotubes was 2.925 kJ·mol-1 less than that of O3/UV/P25.