TiO 2 −ZnO mixed oxide nanoparticles were synthesized by precipitation of zinc nitrate and titanium tetrachloride as precursors and then heat treated using two techniques: hydrothermal and calcination. The particles were characterized using XRD, BET, UV diffuse reflectance, and ζ potential techniques. Additionally, the particles were tested for their ability to induce the photocatalytic oxidation and adsorption of Procion Red MX-5B dye. The highest photocatalytic oxidation was observed for nanoparticulate mixed oxides that were near 100% ZnO or TiO 2 . These materials did not have the highest specific surface areas, yet it is believed that their near-neutral ζ potentials and ideal band gap energies contributed to their higher photocatalytic activities. XRD patterns indicated that sintering and increased crystallinity occurred for the calcined TiO 2 samples.
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Kostedt et al. (2008) studied this question.
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