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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 infrared 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 assynthesized alumina treated by ultrasound show typical absorption bands of functional that groups. Ultrasonically treated assynthesized 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 2­17.5, indicating a mesoporous material, and exhibit a higher specific surface area and pore volume than that of alumina synthesized under normal conditions.

journal of the ceramic society of japan

Effect of ultrasonic irradiation on the characteristics of &amp;gamma;-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; nanorods synthesized from nitrate salt-starch precursors through a facile precipitation method