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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 bioactive compounds incorporation for the production of biodegradable food packagings comes as a viable and environmentally friendly substitute in order to improve the nutritional value as well as extend the shelf life of highly perishable food products. Moreover, the use of bioactive compounds has been directly associated with the promotion of health aspects; the ingestion of bioactive compounds is related with minimizing risks of some diseases such as hypertension, diabetes, and coronary heart diseases. Therefore, the present study carried out a review of the current scenario in the film's production with natural antioxidants addition. The prebiotics and probiotics compound addition in films properties produced were also discussed in this work. Additionally, the film biodegradation properties should also be taken into account for their right disposal in the environment. Some factors that can to affect the biodegradation process are the nature of the polymer, the interactions among the blend components, its crystallinity, and the environmental conditions (light, temperature, O 2 concentrations; and humidity). Therefore, the evaluation of relationships between structure and the polymers biodegradability is the extreme importance.

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