Study on Decomposition Mechanism of Rhodamine B with Photocatalytic Composite Particles

Photocatalysts cleaning dishwater have been studied to high performance. A fluid bed for cleaning dishwater is efficient to contact between photocatalytic particles and dishwater. However, submicron photocatalytic particles are difficult to collect and recover in the fluid bed. This paper presents photocatalytic composite particles in the fluid bed for cleaning dishwater. The developed photocatalytic composite particles consist of floating resin particles covered with photocatalytic particles (TiO2). The efficiency of the photocatalytic composite particles is occurred with an examination of concentration changes in organic dye (Rhodamine B) solution. As a result, after 90min the concentration of Rhodamine B is decreased to 10%. The reaction of Rhodamine B molecules was 2 steps reactions. 1st step was absorption on a surface of metal on photocatalytic particles, and 2nd step was displacement reaction by photocatalysis. Consequently, Rhodamine B molecules were reacted to Florescein molecules by the photocatalytic composite particles.