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Synthesis of lithium aluminate by thermal decomposition of a lithium dawsonite-type precursor
J. Jiménez-Becerril,I. García-Sosa 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.1
Of all ceramic materials, lithium aluminate has been widely studied and has become a good candidate to be used as both a fusion blanket and as a matrix in molten carbonate fuel cells. On behalf of these lithium aluminate applications, a variety of procedures has been proven to prepare adequate crystalline and pure material. In this study, lithium aluminate was synthesized by thermally decomposing a lithium dawsonite-type precursor using aluminum nitrate and chloride as a starting material. The lithium aluminate was characterized by scanning electron microscopy (SEM) and X-ray diffraction. According to the results the crystalline form, in mixtures of several phases, of the lithium aluminate obtained depends strongly on the thermal treatment.
TiO2, Al2O3 and SiO2 as radiocatalyst ceramics.
J. C. González-Juárez,H. Carrasco-Ábrego,J. Jiménez-Becerril 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.4
A simple experiment of gamma irradiated radiolytic versus radiocatalytic 4-chlorophenol degradation is presented. Samples of 4-chlorophenol solutions were put in contact with TiO2, Al2O3 and SiO2 ceramics and gamma irradiated. It was found that addition of these materials improve the degradation in a way similar to photocatalysis. A simple experiment of gamma irradiated radiolytic versus radiocatalytic 4-chlorophenol degradation is presented. Samples of 4-chlorophenol solutions were put in contact with TiO2, Al2O3 and SiO2 ceramics and gamma irradiated. It was found that addition of these materials improve the degradation in a way similar to photocatalysis.
The effect of the calcination temperature of boehmite on its Co(II) adsorption properties
F. Granados-Correa,J. Jiménez-Becerril 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.2
The effect of the calcination temperature treatment of boehmite over its adsorption ability of Co(II) is presented. The materials obtained were characterized through their crystal structure, morphology, specific surface area, surface hydroxyl group content, and Co(II) adsorption at room temperature. It was found that a maximum cobalt adsorption capacity of 1.6634× 10−3 meq Co2+.g-1 in boehmite calcined at 673 K, which showed the highest values of specific surface area and surface hydroxyl group content compared with the other boehmite samples. The specific surface area of boehmite samples became narrow when the calcination temperature was increased, and the cobalt ion adsorption onto boehmite depends on the specific surface area, but it depends mainly on the transition state of alumina because hydroxyl groups are regenerated on the surface of boehmite when the material is suspended in water; therefore, the calcined boehmite is suitable for cobalt adsorption.
Y. Lara-López,G. García-Rosales,J. Jiménez-Becerril 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.1
In this work, titanium oxide particles were synthesized (TiO2) by the sol-gel technique, yielding spherical particles with anaverage diameter of 55 nm and surface area of 50.6 m2/g. The material’s major crystallographic phase is rutile. The CeO2particles synthesized in this work present a spherical morphology of 40 nm with a specific surface area of 43.6 m2/g andrepresent the cerianite crystalline phase. In addition, by means of this synthesis technique, particles composed of TiO2 andceria CeO2 that have an average diameter were not affected by the presence of CeO2. However, the specific area (81 m2/g)significantly increased. Strangely, in the composite material, the predominant phase occurred due to the presence of CeO2,which prevents the growth of rutile crystals. The phenol degradation tests showed that at an initial concentration of 30 mg/L, TiO2 degrades in approximately 20% of phenol after 120 minutes, but at an initial concentration of 50 mg/L, degrades atapproximately 15% after 180 minutes. The other synthesized materials reach degradation of only around 3% in both phenolconcentrations.