Kinetic study of photocatalytic decolorization of C.I. Basic Blue 3 solution on immobilized titanium dioxide nanoparticles

The photocatalytic decolorization of C.I. Basic Blue 3 (BB3) solution on immobilized TiO2 nanoparticles was carried out in a rectangular flat-plate photoreactor. The investigated TiO2 was Millennium PC-500 (anatase, average crystallite size 8 nm, surface area 320.76 m2 g−1) immobilized on non-woven paper. A new kinetic model was proposed on the basis of intrinsic element reactions. The proposed kinetic model fairly resembled the classic Langmuir–Hinshelwood (L–H) equation from its expression. It was found that both kobs (the reaction rate constant) and KR (the adsorption rate constant) were linearly proportional to the light intensity in a rather large intensity range.

Research highlights▶ Photocatalytic decolorization of BB3 in a rectangular photoreactor. ▶ Proposal of a novel kinetic model based on intrinsic element reactions. ▶ Studying the effect of dye concentration and light intensity on photocatalysis.