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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (20): 2261-2265. 上一篇    下一篇

研究论文

高铁酸三钾钠的合成及其物理化学性质研究

何伟春1,2，王建明*,1，周利3，陈权启1，沈报春1，张鉴清1,4   

  1. (1浙江大学化学系 杭州 310027)
    (2河南工业大学材料与工程学院 郑州 450007)
    (3枣庄学院化学化工系 枣庄 277160)
    (4中国科学院金属研究所金属腐蚀与防护国家重点实验室 沈阳 110015)
  • 投稿日期:2006-10-27 修回日期:2007-06-24 发布日期:2007-10-28
  • 通讯作者: 王建明

Study on the Synthesis and Physicochemistry Properties of Tripotassium Sodium Ferrate(VI)

HE Wei-Chun1,2 ;WANG Jian-Ming*,1 ;ZHOU Li3 ;CHEN Quan-Qi1; SHEN Bao-Chun1 ;ZHANG Jian-Qing1,4   

  1. (1 Department of Chemistry, Zhejiang University, Hangzhou 310027)
    (2 College of Material Science and Engineering, Henan University of Technology, Zhengzhou 450007)
    (3 Department of Chemistry and Chemical Engineering, Zaozhuang University, Zaozhuang 277160)
    (4 State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015)
  • Received:2006-10-27 Revised:2007-06-24 Published:2007-10-28
  • Contact: WANG Jian-Ming

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1256

被引次数

28

首次提出了一种在浓的NaOH溶液中电合成0.83 mol•L－1 Na2FeO4溶液进而高纯度合成固态K3Na(FeO4)2的方法. 研究了合成条件, 并利用多种实验技术研究了该固态样品的性质. 实验表明, K3Na(FeO4)2晶体在混合的NaOH-KOH溶液中, 其溶解-沉淀平衡曲线符合经验方程式: [Na＋][K＋]3[ ]2.8＝1.4×10－4 ([K＋]≤1.01 mol•L－1)；在浓的KOH溶液中其溶解度与K2FeO4几乎一致. 和K2FeO4晶体不同, 所得K3Na(FeO4)2晶体显示3个红外特征峰(787, 801～802和858～862 cm－1)并具有P m1 (164)空间群的六方晶胞, 其粉末在Ar气中直到197 ℃才分解, 热稳定性低于K2FeO4.

关键词: 高铁酸三钾钠, 高铁酸钠, 电合成, 红外光谱, XRD, TG/DSC

An electrosynthesis in concentrated NaOH electrolyte is first presented for the synthesis of 0.83 mol•L－1 Na2FeO4 solution, and then for the synthesis of solid K3Na(FeO4)2 with high purity and yield. The synthesis conditions have been explored. Many experiment techniques have been used to characterize the obtained solid sample. The experiment results showed that in the mixed NaOH-KOH solutions, the dissolution-precipitation curve of K3Na(FeO4)2 conformed to the empirical foumula of [Na＋][K＋]3× [ ]2.8＝1.4×10－4 ([K＋]≤1.01 mol•L－1). The measured solubility of K3Na(FeO4)2 in concentrated KOH electrolytes was almost the same as that of K2FeO4. Different from K2FeO4 crystals, the synthesized K3Na(FeO4)2 powders exhibited three characteristic IR absorption peaks (787, 801～802 and 858～862 cm－1) and a hexagonal unit cell with the space group P m1 (164)．The results of TG/DSC experiments showed that the K3Na(FeO4)2 powders would not decompose until 197 ℃ in the atmosphere of Ar, but were less stable than K2FeO4.

Key words: tripotassium sodium ferrate(VI), sodium ferrate(VI), electrosynthesis, IR spectra, XRD, TG/DSC