2016 年 124 巻 12 号 p. 1205-1210
One-dimensional nanostructures of gamma alumina exhibiting excellent properties such as a large surface area and high porosity are widely used as catalysts and adsorbents and in other applications. Here, we report the effect of ultrasound treatment on infra-red spectrum, mineral phase, morphology, and textural properties of gamma alumina nanorods, which were successfully synthesized from salt-starch precursors through a facile precipitation method. We used aluminum ammonium carbonate hydroxide-starch derived from aluminum nitrate at pH 9 and a 2% (w/v) starch slurry, under normal conditions with ultrasound treatment as a precursor. The as-synthesized alumina were then calcined at 600°C. We observed the infra-red spectrum of the as-synthesized alumina treated by ultrasound show typical absorption bands of functional that groups. Ultrasonically treated as-synthesized alumina at 600°C consist of a pure gamma alumina phase with higher intensity and a microstructure of nanorod-like shapes with aspect ratios of 2–17.5, indicating a mesoporous material, and exhibit a higher specific surface area and pore volume than that of alumina synthesized under normal conditions.
