The synthesis of high performance Zr-Ca bifunctional catalysts and their catalytic ozonation effect for the decontamination of m-cresol wastewater

This study proposes a new fabrication of fresh perovskite-based Zr-Ca catalysts. The catalytic behaviors of the bifunctional catalysts prepared by the co-precipitation method were examined during ozonation of m-cresol, a model organic pollutant. The catalysts outperformed the other tested catalysts in the catalytic ozonation of pollutants. The catalytic activity was favored by an aging temperature of 140°C and a calcination temperature in the 700°C–900°C range. The samples were characterized by X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. The most active catalysts were composed of two phases, CaZrO3 and ZrO2. From X-ray photoelectron spectroscopy and in situ Fourier transform infrared studies, we inferred the nature of the active sites and a possible reaction mechanism. The mechanism was suggested as a non-radical mechanism.

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