ZnO/spiral-shaped glass for solar photocatalytic oxidation of Reactive Red 120

ZnO/glass spiral (GS) was prepared by immobilization of ZnO on GS with facile method, and was characterized by X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and the crystallite size of ZnO on GS surface was calculated. SEM showed rod-like shape of ZnO particles on GS surface. Photocatalytic activity of prepared immobilized photocatalyst was investigated for decolourization and degradation of C.I. Reactive Red 120 (RR-120) dye under sunlight. The kinetics of decolourization and degradation removal has been investigated. The effect of pH on decolourization and degradation of dye was studied. The decolourization and degradation of dye were followed by pseudo-first order reaction. The decolourization and degradation of RR-120 dye were enhanced by H2O2 addition to definite dosage beyond that the effect is diminished. Also, the reusability of immobilized ZnO on GS was tested for photocatalytic degradation of dye and it was worth noting that it has high efficiency with slight decrease (5%) after five successive runs. (C) 2014 King Saud University. Production and hosting by Elsevier B.V.