nowadays, there is a growing concern about the environmental impacts of colored wastewater. thus, the present work aims the synthesis, characterization and determination of photocatalytic activity of iron oxide (fe 2 o 3) nanocatalyst, evaluating the effect of hybridization with titanium (TiNPs-Fe 2 o 3) and silver (AgNPs-Fe 2 o 3) nanoparticles, on the degradation of Rhodamine B dye (RhB). nanocatalysts were characterized by XRD, SeM, teM, ftiR, n 2 porosimetry (Bet/BJH method), zeta potential and DRS. photocatalytic tests were performed in a slurry reactor, with the nanocatalyst in suspension, using RhB as a target molecule, under ultraviolet (UV) and visible radiation. therefore, the photocatalytic activity of the nanocatalysts (non-doped and hybridized) was evaluated in these ideal conditions, where the AgNPs-Fe 2 o 3 sample showed the best photocatalytic activity with a degradation of 94.1% (k = 0.0222 min −1 , under UV) and 58.36% (k = 0.007 min −1 , under visible), while under the same conditions, the tio 2-P25 commercial catalyst showed a degradation of 61.5% (k = 0.0078 min −1) and 44.5% (k = 0.0044 min −1), respectively. According with the ideal conditions determined, reusability of the AgNPs-Fe 2 o 3 nanocatalyst was measured, showing a short reduction (about 8%) of its photocatalytic activity after 5 cycles. Thus, the Fe 2 o 3 nanocatalyst can be considered a promising catalyst in the heterogeneous photocatalysis for application in the degradation of organic dyes in aqueous solution.

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The synthesis of metallic nanocatalysts has been a new technological alternative found by researchers to corroborate in the Treatment of Water and Sewer because they have physical and chemical properties for the disinfection of water, analyzed through antimicrobial activity. Thus, this study aims to evaluate the antimicrobial activity of iron oxide nanocatalysts (undoped and doped with metallic nanoparticles). The synthesis of the iron oxide nanocatalysts was by the sodium borohydride oxy-reduction method and doping by impregnation method. Two methodologies were used to assess antimicrobial activity, the method by Disc-diffusion and Minimum Inhibitory Concentration (MIC) using the strains of Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 25922). The results showed that the majority of the nanocatalysts did not show antimicrobial activity, whereas the pure nanocatalyst in the proportion of 2:1 (w/w) showed biological activity up to the concentration of 1.25 mg.L-1 .

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