The photocatalytic oxidation of Rhodamine B (RhB) was studied by using a newly developed immobilized photocatalyst (TiO2 immobilized by support consisting of a perlite and silicone sealant) and a fluidized-bed reactor. Three 8W germicidal lamps were used as the light source and the reactor volume was 2.8 l. When this photocatalyst was employed in a batch process, a total decolorization of the RhB in reaction times lower than 60 min was observed. The optimum dosage of photocatalyst was 33.8 g/l. The initial RhB decolorization rate of the immobilized TiO2 was higher than that of the suspended TiO2 and this did not agree with pseudo first-order kinetics because of the adsorption onto the surface of the immobilized TiO2. This result indicated that the adsorption capacity of the immobilized photocatalyst is very important in photocatalysis.
Nam WS, Kim JM, Han GY, Chemosphere, 47, 1019, 2002
Nazawa M, Tanigawa K, Hosomi M, Chikusa T, Kawada E, Water Sci. Technol., 44, 127, 2001
Park YS, Comparison of Color Removal Between Powder and Immobilized TiO2. In: Proceedings of the Korean Environmental Sciences Society Conference, The Korean Environmental Sciences Society, May. 16-17, Chungbook Province, pp. 267-270. ISSN 1598-6268, 2003