シリカ・アルミナ吸着剤の吸着特性

概要

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Silica gel and alumina have a strong adsorption effect and are utilized widely in analytical chemistry and industrial chemistry. The authors synthesized silica-alumina as an alternative of silica gel, and studied of its adsorption effect dependence upon its surface characteristics and heat treatment by comparing adsorption of Na+, specific surface area and its acidity. The adsorption quantity of sodium ions was proportional to its specific surface area and the acidity of its surface. The greatest value of the specific surface area changed from the lower temperature to the higher temperature as the amount of aluminum increased. Silica-alumina (1.44%Al) showed the strongest acidity. The silica-alumina produced was divided into three groups : (1) 01.09%Al, (2) 1.091.91%Al, and (3) 1.914.27%Al, from the standpoint of quantity of adsorption of sodium ions, acidity of its surface and specific surface area. According to temperature, the silica-alumina was then further divided into four additional groups; (1) 150350°C, (2) 400450°C, (3) 500°C, and (4) 550600°C. It has been made clear that the silica-alumina with 2.70%Al, ignited to 500°C has larger surface area than silica gel and the other silica alumina and was superior adsorbent.
社団法人日本分析化学会の論文