Si-Al-Mg系複合含水酸化物を用いた温泉排水からのフッ素除去に関する研究

概要

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The mixed hydrous oxide is synthesized in a Si/Al/Mg mole ratio of 0.1/0.1/0.8, and its adsorption ability for fluoride ion is examined. The fluoride ion adsorption rate of the Si-Al-Mg mixed hydrous oxide is rapid and its adsorption amount reaches equilibrium after 8 hours at the fluoride test solution used. Logarithm plotting of the adsorption isotherm for fluoride ion almost corresponds to the Freundlich formula. The Si-Al-Mg mixed hydrous oxide has high affinity to fluoride ion, because the value of 1/n in the Freundlich formula shows 0.379. The changing the kind of acid used for the synthesis from nitric acid to hydrochloric acid will improve the selectivity of the Si-Al-Mg mixed hydrous oxide for fluoride ion. Although the adsorption rate for fluoride ion is decrease in the actual hot spring water, the Si-Al-Mg mixed hydrous oxide adsorbs fluoride ion under the waste water quality standards. Therefore, it can be expected that the Si-Al-Mg mixed hydrous oxide is used as a low-cost fluorine adsorbent.
2011-03-30