層状複水酸化物の生成による鉄シアノ錯体の除去

概要

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The removal of hexacyanoferrate(III) and (II) ions, [Fe(CN)_6]^<3-> and [Fe(CN)G]^<4-> from aqueous solutions (10-500ppmFe) by coprecipitation with various M^<2+>-Al layered double hydroxide (LDH) precipitates (M2^<2+>= Mg. Mn. Ni, and Zn) has been investigated at 25℃. The higher coprecipitation of [Fe(CN)_6]^<3-> ion was observed at pH higher than 8.5 in the case of Mg-Al system and at wide pH range of 5.0 10.5 in the cases of other systems. The solid products containing a lot of [Fe(CN)_6]^<3->ion were found to have a LDH layer structure with basal spacing of 11.0 A, which means that [Fe(CN)_6]^<3-> ion was intercalated in the LDH interlayer space. However, in the cases of Mn-Al and Ni-Al systems, [Fe(CN)_6]^<3-> ion was coprecipitated as hexacyanoferrate salts only at pH lower than 6.5. In addition. [Fe(CN)_6]^<3-> ion was also found to be removed much easier compared to [Fe(CN)_6]^<3-> ion because of its higher negative electric charge. Finally, the optimum conditions for the removal of [Fe(CN)_6]^<3-> ion were obtained. The coprecipitation method for intercalation of anions into the LDH interlayer space is useful for the removal of harmful hexacyanoferrate ions and other relative cyano-complex anions.
八戸工業高等専門学校の論文
2005-12-19