Effect of Aging Method on Adsorption and Elution of Phosphate in Mg/Fe Layered Double Hydroxide

Yuki Ogawa; Masashi Kurashina; Eiji Kanezaki; Takashi Yamamoto

doi:10.4028/www.scientific.net/AMR.1110.287

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1110Effect of Aging Method on Adsorption and Elution...

Effect of Aging Method on Adsorption and Elution of Phosphate in Mg/Fe Layered Double Hydroxide

Abstract:

Layered double hydroxide (LDH) is a compound and has exchangeable anion intercalated in its interlayer. LDH has been investigated to apply its interlayer anion as a useful material. We have been focused on interlayer phosphate. Phosphorus is an essential element for crop plants and an exhaustive resource. In this study, we investigated the phosphate elution from Mg/Fe LDHs and controlled its amount from two points of view. Firstly, we synthesized precursor of Cl^– intercalated Mg/Fe LDH by coprecipitation using NaOH solution. Next, the yielded precipitate was aged by two methods: reflux and hydrothermal treatments. Finally, HPO₄^2– adsorbed Mg/Fe LDH was synthesized by means of anion exchange of Cl^– with HPO₄^2– in Mg/Fe LDH. In XRD and EXAFS measurements, α-Fe₂O₃ was detected in the hydrothermal samples. The elution of phosphate was observed in Na₂CO₃ aqueous solution. After 24 hours, the eluted ratio of phosphate was 67% for the reflux sample and 23% for the hydrothermal sample. The decomposition was suppressed in the latter.

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Advanced Materials Research (Volume 1110)

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287-290

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1110.287

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Online since:

June 2015

Authors:

Yuki Ogawa, Masashi Kurashina*, Eiji Kanezaki, Takashi Yamamoto

Keywords:

Adsorption, Elution, Layered Double Hydroxide, Phosphate

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References

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