This work described a new magnetic material enriched with strontium as catalyst to produce babassu biodiesel. The use of magnetic materials has attracted attention due to easy and fast separation from reaction medium. Moreover, they are ecologically correct, due to they generate less discards to the environment. Techniques of analysis and characterization were carried out to check the synthesis of magnetite and strontium ferrite, besides to verify the presence of hydroxide and carbonate in the structure of the strontium oxide. The best catalytic activities presented conversions of 78.6% and 89.7% when using the catalysts SrO/Fe 3 O 4 and SrO/SrFe 2 O 4 , respectively. Density studies of the alkali active sites were performed to elucidate the best activity for the catalyst composed with SrFe 2 O 4 .

Tetracycline is used to treat various diseases in animals and humans, so its high use causes this substance to be frequently found in effluents and in potable water reservoirs, causing serious problems for human health and the environment. Many processes are applied and evaluated in an attempt to removal tetracycline found in environment, such as adsorption. The application of iron-carbon nanoparticles with core-shell structure (Fe 3 O 4 @C) as adsorbent, can be an alternative to removal of these contaminants. In the present study Fe 3 O 4 @C nanoparticles were synthesized and used to adsorb tetracycline in aqueous solutions. The core-shell characterization was performed using X-ray diffraction techniques, infrared spectroscopy, surface area, chemical analysis and morphology, and adsorption capacity through isotherms. The results indicated that Fe 3 O 4 @C nanoparticles presented good tetracycline removal capability, 73.3%, when applied an initial concentration of antibiotic of the 30 mg L-1 and 0.5 g of adsorbent.

Índices para catálogo sistemático: 1 1. Divulgação científica 501 Eliete Marques da Silva -Bibliotecária -CRB-8/9380 Coletânea internacional de pesquisa em ciências aplicadas e ciências exatas [livro eletrônico] : v. 1 / organização Seven Publicações. --Curitiba, PR : Seven Events, 2022. PDF Vários autores. Bibliografia.