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, HPO42– adsorbed Mg/Fe LDH was synthesized by means of anion exchange of Cl– with HPO42– 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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