Calcium hydroxide (Ca(OH) 2) is recognized as an efficient bactericide and is widely applied as a root canal filler in endodontic treatment. Ca(OH) 2 is mainly produced by hydration of calcium oxide (CaO), a product of the thermal decomposition of calcium carbonate (CaCO 3) from sources such as limestone. In this work, calcium hydroxide particles were synthetized by the thermochemical transformation of waste biomass from the tequila industry. Agave biomass processed at 600 °C was composed mostly of calcium carbonate (CaCO 3), while calcination at 900 °C followed by hydration produced Ca(OH) 2. The morphology and crystalline nature of the Ca(OH) 2 particles were characterized by micro-Raman spectroscopy, scanning electron microscopy and X-ray diffraction analysis. Bactericidal activity of synthesized calcium hydroxide was evaluated with the agar diffusion assay. Our results provide evidence that Ca(OH) 2 obtained from agave biomass is an effective bactericidal against Escherichia coli and Enterococcus faecalis. Biomass from agave is available in Mexico and the rest of the American continent, the use of processed bagasse for medical applications could provide a venue for the useful disposition of industrial waste. Palabras clave: recursos renovables, ceniza, bactericida, Ca(OH) 2 RESUMEN El hidróxido de calcio (Ca(OH) 2) es reconocido como un eficiente bactericida y es ampliamente utilizado como relleno de la raíz dental en tratamientos de endodoncia. El Ca(OH) 2 es producido por la hidratación del óxido de calcio (CaO), un producto de la descomposición térmica del carbonato de calcio (CaCO 3), obtenido principalmente de piedra caliza. En el presente trabajo, se sintetizaron partículas de hidróxido de calcio SHORT COMMUNICATION / COMUNICACIÓN BREVE
The goal in this study was to synthesize a lanthanum -nickel phase (Ruddlesden-Popper phases) La 4 Ni 3 O 10 . This material was prepared using a polymeric route. An easy synthesis method is presented in order to obtain an economical cathode material, which can be used in Solid Oxide Fuel Cells (SOFC). The polymeric precursors were prepared following the Castillo method. The originality of this work was to optimize the ratio HMTA/ metallic salts from 1 to 6. The obtained powders were characterized by thermal analysis; Differential Scanning Calorimetry (DSC Q10 Instrument TA), Thermogravimetric Analysis (TGA -Q50 Instrument TA-) and Xray diffractometer (Bruker, D8 Advance diffractometer), in order to determine the crystallized phase. Experiments 5 and 6 did not present coagulation but after few days, solution 5 was transformed into a gel. Gels 2 to 5 were heated in order to obtain a solid material. These powders are characterized by thermogravimetric and thermo-differential methods. The powders obtained at 800, 900 and 1000°C were analyzed by X-ray diffraction and it was found that the temperature to get to the La 4 Ni 3 O 10 phase was 1000ºC.
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