TY - JOUR
T1 - Sorption characteristics of fluoride on to magnesium oxide-rich phases calcined at different temperatures
AU - Sasaki, Keiko
AU - Fukumoto, Naoyuki
AU - Moriyama, Sayo
AU - Hirajima, Tsuyoshi
N1 - Funding Information:
Financial support was provided to KS by Japan Society for Promotion of Science (JSPS) Grant in Aid for Scientific Research No. 22246117, Funding Program for Next Generation of World-Leading Researchers ( GR078 ), and Japan Science and Technology Agency (JST) . The collection of XRD patterns was performed at the Center of Advanced Instrumental Analysis, and TEM images were collected at the Research Laboratory for High Voltage Electron Microscopy (HVEM) in Kyushu University. The CO 2 -TPD curves were obtained by courtesy of Prof. Yasutake Teraoka at Department of Energy and Material Sciences, Kyushu University.
PY - 2011/7/15
Y1 - 2011/7/15
N2 - The effect of calcination temperature during production of magnesium oxide-rich phases from MgCO3 on the sorption of F- ions in the aqueous phase has been investigated. Magnesium oxide-rich phases were formed by calcination at over 873K for 1h. Higher calcination temperatures produced more crystalline MgO with smaller specific surface area and provided larger values of the total basicity per unit surface area. The higher calcination temperatures lead to slower F- removal rate, and lower equilibrium F- concentrations, when the equilibrium F- concentrations are less than 1mmoldm-3. Larger total basicity per unit surface area made the reactivity with F- ions in aqueous phase more feasible, resulting in a greater degree of F- sorption. For equilibrium F- concentrations more than 1mmoldm-3, lower calcination temperatures favored the co-precipitation of F- with Mg(OH)2, probably leading to the formation of Mg(OH)2-xFx, and the achievement of larger sorption density. This is the first paper which describes the relationship between the solid base characteristics obtained by CO2-TPD for MgO with different calcination temperatures as a function of the reactivity of F- sorption in the aqueous phase.
AB - The effect of calcination temperature during production of magnesium oxide-rich phases from MgCO3 on the sorption of F- ions in the aqueous phase has been investigated. Magnesium oxide-rich phases were formed by calcination at over 873K for 1h. Higher calcination temperatures produced more crystalline MgO with smaller specific surface area and provided larger values of the total basicity per unit surface area. The higher calcination temperatures lead to slower F- removal rate, and lower equilibrium F- concentrations, when the equilibrium F- concentrations are less than 1mmoldm-3. Larger total basicity per unit surface area made the reactivity with F- ions in aqueous phase more feasible, resulting in a greater degree of F- sorption. For equilibrium F- concentrations more than 1mmoldm-3, lower calcination temperatures favored the co-precipitation of F- with Mg(OH)2, probably leading to the formation of Mg(OH)2-xFx, and the achievement of larger sorption density. This is the first paper which describes the relationship between the solid base characteristics obtained by CO2-TPD for MgO with different calcination temperatures as a function of the reactivity of F- sorption in the aqueous phase.
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U2 - 10.1016/j.jhazmat.2011.04.071
DO - 10.1016/j.jhazmat.2011.04.071
M3 - Article
C2 - 21571430
AN - SCOPUS:79957679423
SN - 0304-3894
VL - 191
SP - 240
EP - 248
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -