Boron Adsorption Behavior on Hydrous Cerium Oxide in Hydrothermal Conditions

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  • 水和酸化セリウムの高温水中でのホウ素吸着性

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For the purpose of developing an adsorbent usable for extraction of boron from geothermal brines, the adsorption behavior of boron in agueous solution on hydrous cerium(IV) oxides was investigated by means of batch tests in the temperature range of 25-200°C. The hydrous cerium oxide with low crystallinity and large specific surface area had high adsorbability for boron. Amounts of adsorbed boron per unit surface area were approximated by a single Freundlich isotherm, irrespective of specimen used (Fig.3). As to the effect of adsorption temperature, it was fo und that the amount of adsorbed born increased with increasing temperature above 100°C (Fig.4). An infrared absorption peak (1470 cm-1), which is attributable to the OH bending vibration of hydrous cerium oxide, decreased with increasing temperature above 100°C (Fig.8). Anion-exchange reaction between OH group and borate ion is promoted above 100°C due to the dissociation of OH groups under the hydrothermal conditions. The adsorbed boron could be eluted with dilute NaOH solution, therefore, hydrous cerium oxide can be used as an adsorbent suitable for extracting boron from hot water.

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  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1991 (4), 331-335, 1991-04-10

    The Chemical Society of Japan

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