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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.
A study on the ball-milling effect of calcined Mg-Al hydrotalcite on the CO2 adsorption behavior
F. Granados-Correa,J.L. Iturbe-García,J. Bonifacio-Martínez 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.6
We have investigated the effect of ball-milling over calcined Mg-Al hydrotalcite, with regard to its CO2 adsorption capacity. The prepared materials were systematically characterized by X-ray diffraction, scanning electron microscopy and N2 physisorption measurements. The results reveal an excellent adsorption capacity of CO2 by calcined Mg-Al hydrotalcite; however, when this adsorbent was treated by ball-milling for 2 h, a slight decrease in its CO2 adsorption capacity was observed, mainly attributable to the decreased surface area, total pore volume, pore size and the formation of particle aggregates of the aforementioned hydrotalcite. Therefore, alterations in structure, texture and morphology of calcined Mg-Al hydrotalcite during the ball-milling treatment do not optimize its CO2 adsorption capacity.