Abstract. Ce doped TiO 2 catalyst was synthesized by sol-gel method. This gel was dried at 70 ˚C during 2 hours and afterwards was calcined at 500 ˚C for 4 h. Then, the anatase TiO 2 catalyst power were obtained. The 0.3wt% Ce/TiO 2 catalyst is efficient and stable catalyst for the photodegradation on the 2,4-DCP solution. At the experimental conditions of initial 2,4-DCP solution at 10 mg/L, UV lamp at 20 W, catalysts concentration at 0.5 g/L , the mineralization ratio at 98.14 % could be achieved after 600 min of photodegradation reaction. And the Ce/TiO 2 catalyst also showed photodegradation ability on 2,4-DCP unber simulate solar light , the mineralization ratio at 55.23 % could be achieved after 600 min of solar photodegradation reaction.

Abstract. Fe doped TiO 2 particles were synthesized by sol-gel method. This gel was dried at 70 ˚C during 2 hours and afterwards was calcined at 450 ˚C during 4 h. Under calcinations at 450 ˚C (4 h), catalyst particle with an average diameter around 59 nm and monophasic anatase structure were obtained. The 0.3wt% Fe/TiO 2 catalyst behaved as efficient and stable catalyst for the photodegradation of phenol solution. At the experimental conditions of initial phenol solution at 10 mg/L, initial pH of the phenol solution at 6.0, UV lamp at 20 W, catalysts concentration at 0.5 g/L , the COD removal of 99 % could be achieved after 240 min of photodegradation reaction.

Titanium dioxide (TiO 2) photocatalyst and diatomite adsorbent were made into a paper-like composite by a papermaking technique using pulp and ceramic fibers as sheet matrix. Simulated wastewaters that contain methylene blue (MB) bleached in photocatalytic TiO 2-diatomite sheet was investigated under UV irradiation. The TiO 2-diatomite sheet could remove the MB from water completely under UV irradiation. The characteristics of composite sheets were studied by XRD and SEM techniques. It was found that the composite TiO 2-dioatomite composite sheet could be utilized semi-permanently and was easier to handle than the original TiO 2 powders in aqueous media. Consequently, a composite TiO 2-diatomite sheet can be utilized as a high functional material to photodegradate organic pollution.