Abstract
TiO2–CeO2 photocatalysts were synthesized by a high energy ball milling process at different milling speed and their photocatalytic activities were evaluated by measuring degradation efficiency of methyl orange. Phases, crystal size, microstrain, and morphology were evaluated. The results have demonstrated that the milling reduces the average crystallite size for any milling speed. Increasing speed leads to the sticking of small particles to form strong and porous agglomerates with a lower specific surface area. XRD analysis shows that the enhanced milling speed affects pronounced anatase-to-rutile phase transformation. All of these changes influence the photocatalytic activity that is decreased by milling speed increase. Role of CeO2 in the TiO2–CeO2 photocatalytic system is to prolong life of electron/hole pair formed by the interaction of light with TiO2.
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