Synthesis of Mg-Fe-Al layered double oxide (LDO) and its application to arsenate anion adsorption

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  • Mg-Fe-Al系層状複酸化物（LDO）の合成とヒ酸アニオン吸着への応用

Abstract

<p>Soil containing arsenic exceeding 0.01 mg/L, the standard value for soil elution specified by the Soil Contamination Countermeasures Law, may be mined as a result of tunnel and dam construction. Recovery of arsenic by adsorption is considered effective because the soil can be reused if arsenic can be extracted. In this study, Mg-Fe-Al LDO (sol-gel) was synthesized for new adsorption site expression, and the structure and morphology of the synthesized LDO were investigated. The adsorption behavior of arsenate anion was also investigated by adsorption experiments to evaluate its performance as an adsorbent. The specific surface area of LDO synthesized by the sol-gel method was about 1.7 times larger than that of LDO synthesized by the coprecipitation method, and the amount of arsenate anion adsorption was about 2.0 times larger with the addition of Fe.</p><p>It is suggested that the use of Fe, which has excellent affinity with As, has been used as a new adsorption site.</p>

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