<論文>高pH水へのシリカ溶解速度の吸光光度計による測定

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Used silica samples were considered to be consisted of fine crystal particles with diameter of 4 nm. The samples were calcined for 2 hours at 300 - 800℃. Dissolving velocity of silica particles into pH 10 solution was measured by using a spectrophotometer at 25℃. Relationship between the dissolving velocity and the calcined temperature of silica showed a maximum at 600℃. Specific surface areas, pore volumes and pore diameters of the calcined samples were obtained from the absorption isotherms of benzene at O℃. Cobalt ion (II) adsorption on the calcined sample was measured and the relation to the calcined temperature showed a maximum at 600℃. The Co adsorption value relates with activity of OH^- on sample. Heat of immersion on silica sample was measured and approximately proportional to the specific surface area. When the calcined temperature rose, the dissolving velocity increased because OH^- activity on silica surface increased in high pH solution. While, during increasing temperature silica decreased specific surface area by sintering between fine crystal particles and stabilized the silica surface, so the dissolving velocity decreased. Therefore, the dissolving velocity took a maximum value in the middle.
沼津工業高等専門学校の論文
1999-01-29