Abstract
Magnetic nanoparticles (MNP) composed of iron oxide (or other metal–FeO cores) coated with carbon produced by chemical vapour decomposition (CVD) were used in the photocatalytic ozonation of oxamic acid (OMA) which we selected as a model pollutant. The incorporation of Ag and Cu on FeO enhanced the efficiency of the process. The carbon phase significantly increased the photocatalytic activity towards the conversion of OMA. As for the synthesis process, raising the temperature of CVD improved the performance of the produced photocatalysts. The obtained results suggested that the carbon phase is directly related to high catalytic activity. The most active photocatalyst (C@FeO_CVD850) was used in the removal of other compounds (dyes, industrial pollutants and herbicides) from water and high mineralization levels were attained. This material was also revealed to be stable during reutilisation.
Highlights
Photocatalytic ozonation (PCO) results from the combination of two different techniques, and the potential of pollutant abatement increases since the generation of hydroxyl radicals is promoted [1]
A drastic decrease to values lower than 10 m2 g−1 was observed in the surface area of magnetic nanoparticles (MNP) coated by chemical vapour decomposition (CVD)
This decrease is due to the heat treatments used during synthesis, namely the heating up to 400 ◦ C to carry out the reduction of the metal under hydrogen and, after that, a temperature increase up to 750 ◦ C or 850 ◦ C to coat the MNP with carbon [13]
Summary
Photocatalytic ozonation (PCO) results from the combination of two different techniques, and the potential of pollutant abatement increases since the generation of hydroxyl radicals is promoted [1].
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