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Sorption of Arsenate by the Calcined Mg-Al Layered Double Hydroxide  

Seo, Young-Jin (Gyeongsangbukdo Agricultural Research and Extention Services)
Kang, Yun-Ju (Gyeongsangbukdo Government Public Institute of Health and Environment)
Choi, Jung (Department of Agricultural Chemistry, Kyungpook National University)
Kim, Jun-Hyeong (Department of Agricultural Chemistry, Kyungpook National University)
Park, Man (Department of Agricultural Chemistry, Kyungpook National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.41, no.6, 2008 , pp. 369-373 More about this Journal
Abstract
Special concern has been given to the elevated arsenic content in soils because of its high mobility and toxicity. Layered double hydroxide (LDH) which has a high anionic exchange capacity is another potential anion adsorbent for toxic anions such as arsenic, chromate and selenium etc. The uptake of arsenate from aqueous solutions by the calcined Mg-Al LDH has been investigated. The sorption capacity was about 530 mmol/kg. Sorption isotherm was defined as L-type in which arsenate was removed by LDH through anion uptake reaction. Arsenate sorption by the calcined Mg-Al LDH was occurred by reconstruction of LDH's framework. Competitive adsorption revealed that Mg-Al LDH had higher selectivity for arsenate than for sulfate. These results strongly suggest that calcined Mg-Al LDH has a promising potential for efficient removal of toxic metal oxides like arsenates from aqueous environments.
Keywords
Layered Double Hydroxide(LDH); Arsenate; Sorption; Heavy metal;
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