Acylation of epoxidized soybean biodiesel catalyzed by SnO/Al 2 O 3 and evaluation of physical chemical and biologic activity of the product

GRAPHENE OXIDE AND A GO/ZnO NANOCOMPOSITE AS CATALYSTS FOR EPOXY RING-OPENING OF EPOXIDIZED SOYBEAN FATTY ACIDS METHYL ESTERS

“…88.2%), and poorly opened using only ZnO (ca. 59.6%) as catalysts, at optimal conditions, at 120 ºC for 24 h. The selectivity was increased when the amount of catalyst was enhanced to 10% w/w, being still a low amount of catalyst, mainly ZnO in the GO/ZnO nanocomposite, comparing with works in the literature with similar results using 15% w/w of catalyst for epoxy ring-opening in the acetylation reaction (Oliveira et al, 2017). The results are even better when the amount of GO was enhanced to 20% w/w, showing the efficiency of GO as acid catalyst.…”

“…The 1 H NMR spectrum shows that the typical signals of the hydrogen adjacent to the FAME unsaturation bond at 5.2 -5.6 ppm (Y in Figure 5b) vanished. Concomitantly, the hydrogen signals of the epoxide ring arose between 2.8 -3.2 ppm, Z in Figure 5b (Jacintho et al, 2009;Oliveira et al, 2017). The conversion of soybean FAME to epoxide soybean FAME (Y initial -Y final /Y initial x 100) was ca.…”

“…After the FAME epoxidation, the oxirane ring opening was performed by acetylation reaction (Oliveira et al, 2017), in which FAME epoxide (1,0 g) was mixed with acetic anhydride (1,0 g) and different amounts of GO, ZnO and GO/ZnO catalysts were added to the mixture under stirring in a Schlenk tube at 120 ºC for 12 h or 24 h. The modified FAME was washed with ethanol and centrifuged at 6000 rpm for 15 min, then dried under vacumm for 24 h. The reusability of GO and GO/ZnO catalysts was measured in the oxirane ring-opening of epoxidized soybean FAME; three cycles of the catalytic experiment for each catalyst were carried out in optimal conditions. In all recycling experiments, the reaction mixture was centrifuged after the reaction in order to separate the catalysts.…”

Adsorption of CO2 on MgAl-CO3 LDHs-Derived Sorbents with 3D Nanoflower-like Structure

“…In a certain mass of C-LDHs, the actual content of alumina decreases with the increase of the molar ratio of Mg/Al. In general, alumina is usually used as support in the catalytic reactions owing to the relatively high specific surface area and porous structure. , Therefore, the C-LDHs with the lowest value of Mg/Al molar ratio and the maximum content of alumina yields the highest specific surface area. It is noted that the C-LDHs with a Mg/Al molar ratio of 2 has the largest specific surface area, which is favorable for the improvement of CO 2 sorption performance.…”

<p>Eco-Friendly and Systematic Study for Synthesis of La³⁺/α-Al₂O₃ Nanoparticles: Antibacterial Activity Against Pathogenic Microbial Strains</p>

“…24 Among the most promising of the new antimicrobial agents' metal oxide nanoparticles have been shown to have high potential antibacterial activity in a large number of studies. [25][26][27][28] Different researchers have indicated that Al 2 O 3 contamination with other antioxidant metals improves photocatalytic activity and stability in α-Al 2 O 3 structural phase, [29][30][31] and leads to shifted emission peaks toward visible light, in addition to the presence of an auxiliary species, which can be effective in reducing the time of complete elimination of bacteria in the presence of ultraviolet light. 32,33 Nanocomposites with the use of ultrafine particles have wide applications in antibacterial properties.…”