表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
60 巻 , 11 号
選択された号の論文の9件中1~9を表示しています
小特集/レーザーによる表面処理技術の新展開
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  • 征矢 勝秀, Dalibor Kuchar, 窪田 光宏, 松田 仁樹, 福田 正, 柳下 幸一
    2009 年 60 巻 11 号 p. 732
    発行日: 2009/11/01
    公開日: 2010/05/28
    ジャーナル フリー
    In this work, hydrothermal decomposition of [Fe(CN)6]3− in alkaline solution was conducted in a batch-type autoclave. The initial concentration of CN in [Fe(CN)6]3− in the sample solution was set to correspond to 1,000 mg CN/dm3. The experiments were conducted at temperatures of 403-443 K under O2 atmosphere at 0.1-4 MPa pressure. Hydrogen peroxide (H2O2) was used as an oxidation agent to enhance oxidative decomposition of [Fe (CN)6]3−. Moreover, the mechanism of this reaction was discussed.
    Results show that the rate of hydrothermal decomposition of [Fe (CN)6]3− is independent of O2 partial pressure. The rate is sufficiently described by first-order reaction Kinetics with respect to the [Fe(CN)6]3− concentration. The principal reaction products of cyanate (OCN), formate (HCOO), and ammonium (NH4+) ions were detected using ion chromatography. When H2O2 was added to [Fe(CN)6]3− solution, the decomposition rate of CN in [Fe(CN)6]3− at the initial stage of the reaction (0.5-2 h) was found to be 1.2-1.3 times higher than that without H2O2. The reaction products of HCOO, carbonate (CO32−) and NH4+ ions were detected. Such different reaction products resulting from H2O2 addition suggest the formation of CO32−and N2 during oxidative decomposition of [Fe(CN)6]3− by H2O2.
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