Abstract: The CeTiO2/diatomite photocatalytic materials were prepared by lowtemperature combustion synthesis(LCS) method， which were characterized by XRD and SEM. The optimized photocatalytic preparation and degradation conditions of the supported photocatalytic materials were studied and determined， which selected Rhodamine B solution as the target pollutants. The results showed that the optimized calcination temperature was 600℃ and the optimized amount of doped Ce was 02%. The prepared samples were composed of anatase and rutile mixed polymorphs， and the anatase accounted for the major part. The optimized photocatalytic degradation conditions were Rhodamine B solution with initial concentration of 10mg/L， the amount of catalyst of 10g/L and the solution pH of 9. The degradation rate of the composite photocatalyst materials after deactivation and regeneration was 93%， and can be used repeatedly. Its photocatalytic performance was much better than that of the pure TiO2 photocatalytic material.

Key words: diatomite, LCS method, TiO2, Ce doping, photocatalytic degradation