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Nanostructure ZnO thin films ZnO have been coated on glass bead by our novel centrifuge coating technique. The structure, surface and optical properties of the particles and thin films were characterized by XRD, SEM, AFM and UV/Vis techniques. The photoassisted degradation of four different azo textile dyes (C.I. Reactive Yellow 84 (HR), C.I. Reactive Red 195 (3BF), Erichrome blue black B (EBB) and Methyl orange (MO)) was examined in a batch reactor using nanostructure ZnO thin films on glass beads. The ZnO thin films loading of the glass bead was 0.23% (w/w). The amount of ZnO on the film was about the same the ZnO powder added in suspension to discolor the same solution of the same azo dyes used as a probe. Mineralization (TOC) of the azo textile dyes was attained within ca. 2 h of UV irradiation of the ZnO thin films glass bead/azo textile dye system. Mineralization kinetics was, in general, appreciably influenced by the pH and tends to be somewhat slower in alkaline or acidic media. Methyl orange was photomineralized more slowly than the others. Final products were, in all cases, CO 2 , NH 4  +  and NO 3  -  ions and SO 4  2-  ions. Effects of other parameters like catalyst-loading, initial dye concentration, and UV radiation intensity on the rate of mineralization were studied.

Photocatalytic Mineralization of Azo Dyes Using Nanostructure ZnO Thin Film Coated on Glass Bead