Concerns about maintaining a healthier diet and consuming less processed foods with chemical additives have been growing over many years because it is known that the accumulation of these substances in the body can influence the development of cancerous diseases. Against this backdrop, the food industry is seeking alternatives derived from natural sources, such as plants and vegetable oils that are rich in bioactive compounds, to be used as substitutes for artificial compounds (Khorshidian, Yousefi, Khanniri, & Mortazavian, 2017; Radünz et al., 2019). Essential oils can be considered as a potential source of industrial applications due to their biological and medicinal properties. They act as bactericides, fungicides, virucides, parasiticides, analgesics

Pure forms of alkaline-earth stannates with perovskite structure (ASnO 3 , A= Ca ) have been used as photocatalysts. In this work, CaSnO 3 perovskite sample was synthesized by a modified Pechini method at 800 ºC and characterized by X-ray diffraction (XRD), UV-visible spectroscopy, infrared spectroscopy and Raman spectroscopy. The photocatalytic degradation of remazol golden yellow (RNL) dye under UV radiation was evaluated. The XRD pattern showed that the synthesis method favored the orthorhombic CaSnO 3 crystallization. According to the Raman spectrum, a material with high short-range order was obtained despite of the relatively low synthesis temperature, compared to the solid-state reaction one. The highest photocatalytic activity was attained at pH 3, which presented 51% discoloration and improved activity of 35% compared to discoloration solely due to adsorption (absence of radiation). The point of zero charge (PZC) and the photocatalytic results indicated that a direct mechanism prevailed at pH 3, whereas an indirect mechanism prevailed at pH 6.

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SrSnO 3 , a perovskite-type complex oxide, was synthesized by the modified Pechini method using two different precursors, tin chloride and metallic tin. The first one is already traditional in the literature and it claims about 30 days, only for the cleaning of tin citrate aiming at the elimination of the chloride. The second route was developed by our research group and saves time, taking 6 h to complete the synthesis of the resin. The results show that SrSnO 3 obtained from the metallic tin show a higher short range order, leading to a band gap value higher than those reported in the literature, besides a meaningful reduction in the formation of SrCO 3 , as compared to the one obtained from tin chloride. Keywords: perovskite, stannate, chemical synthesis. Resumo