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化学学报
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化学学报 ›› 2004, Vol. 62 ›› Issue (19): 1951-1955. 上一篇    下一篇

研究简报

K2FeO4在稀KOH溶液中的稳定性研究

杨卫华1,2, 王建明1, 曹江林1, 潘滔1, 张鉴清1,3, 曹楚南1,3   

  1. 1. 浙江大学化学系, 杭州, 310027;
    2. 华侨大学材料科学与工程学院, 泉州, 362011;
    3. 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:2003-10-14 修回日期:2004-06-02 发布日期:2014-02-17
  • 通讯作者: 王建明,E-mail:wjm@cmsce.zju.edu.cn;Tel:0571-87951513;Fax:0571-87951895. E-mail:wjm@cmsce.zju.edu.cn
  • 基金资助:
    国家自然科学基金(No.50172041)资助项目.

Stability of K2FeO4 in Dilute KOH Solution

YANG Wei-Hua1,2, WANG Jian-Ming1, CAO Jiang-Lin1, PAN Tao1, ZHANG Jian-Qing1,3, CAO Chu-Nan1,3   

  1. 1. Department of Chemistry, Zhejiang University, Hangzhou 310027;
    2. College of Materials Science and Engineering, Huaqiao University, Quanzhou 362011;
    3. State Key Laboratory for Corrosion and Protection Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015
  • Received:2003-10-14 Revised:2004-06-02 Published:2014-02-17

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采用分光光度法对K2FeO4在初始pH=8.0～13.0的KOH溶液中的稳定性作了系统研究.研究发现,在恒定温度下,K2FeO4的稳定性受其浓度、溶液的碱度和其分解产物FeOOH的催化分解作用三方面影响.HO-离子浓度的增大将阻碍FeO42-离子之间的碰撞,从而有利于增强K2FeO4的稳定性,但HO-离子浓度增大到一定程度后,K2FeO4的分解产物容易生成FeOOH,而FeOOH将催化K2FeO4的进一步分解.研究结果表明,0.5 mmol·L-1的K2Fe04在pH=10.0～11.0的KOH溶液中最稳定,其初始阶段分解过程为-级反应;溶液初始pH值不同,K2FeO4的稳定性随其浓度变化的规律亦不相同.

关键词: K2FeO4, 稳定性, 分光光度法

The stability of K2FeO4 in dilute KOH solution with initial pH value from 8.0 to 13.0 was studied in detail by spectrophotometry method in this paper. The decomposition rate of aqueous solution of K2FeO4 is basically regulated by its concentration, pH and the decomposed product FeOOH that can catalyze the decomposition of K2FeO4. The increase of HO- concentration can improve the stability of K2FeO4 by decreasing the collision frequency between FeO42- ions. However, when the concentration of HO- reaches a certain value, the decomposition product FeOOH is easily produced. FeOOH can catalyze the decomposition of K2FeO4. It was found that K2FeO4 is the most stable in the pH region of 10.0～11.0 and the decomposition rate of K2FeO4 is in the first order in the initial period. The decomposition rule of K2FeO4 along with its concentration in KOH solution is related with the initial pH of the solution.

Key words: K2FeO4, stability, spectrophotometry method