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Magnesium oxide was produced by calcination of MgCO3 reagent at 1273 K for 1h. The product was confirmed to be a single phase of MgO by XRD. After sorption of 9.98 mmol・L-1 fluoride ions, the solid re...sidues were dried and calcined again at 1273K for 1h. Then the second sorption of fluoride was conducted in the same manner as in the first phase of sorption. All XRD peaks for products were assigned to MgO. The order of sorption density of fluoride (mol・L-1) apparently seems to be dependent on the specific surface area. However, after normalization of the sorption density for the specific surface area (mmol・m-1), Q' values were found to be different. In the CO2-TPD curves for calcined products, a component, which has the maximum peak at 415K, was considered to be responsible for removal of fluoride. The peak intensity was converted to basicity per specific surface area (as CO2 μmol・m-2). It was found there was a positive relation between the basicity and the removal efficiency of fluoride.show more
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