物理化学学报 >> 2002, Vol. 18 >> Issue (09): 817-820.doi: 10.3866/PKU.WHXB20020910

研究简报 上一篇    下一篇

高碘酸盐-亚硫酸盐反应体系的复杂动力学

林娟娟;王舜;高庆宇   

  1. 温州师范学院化学系,温州 325027;中国矿业大学化工学院,徐州 221008
  • 收稿日期:2001-12-07 修回日期:2002-02-06 发布日期:2002-09-15
  • 通讯作者: 林娟娟 E-mail:lijj@mail.wzptt.zj.cn

Complex Kinetics of the Periodate-Sulfite System

Lin Juan-Juan;Wang Shun;Gao Qing-Yu   

  1. Wenzhou Normal College, Wenzhou 325027;China University of Mining and Technology, College of Chemical Engineering, Xuzhou 221008
  • Received:2001-12-07 Revised:2002-02-06 Published:2002-09-15
  • Contact: Lin Juan-Juan E-mail:lijj@mail.wzptt.zj.cn

摘要: 研究了KIO4-Na2SO3-H2SO4 反应体系的复杂动力学,在酸性条件下(pH<3),发现碘电位、Pt电极电位和pH在封闭体系中显示单峰振荡以及半封闭体系和开放体系中的振荡现象.振荡现象受[Na2SO3]0/[KIO4]0比值以及体系的酸度影响.实验结果表明该体系可能为I2生成和I2消耗所驱动的振荡反应;所拟的反应机理解释了体系所显示的复杂动力学现象.

关键词: 化学振荡反应, 复杂动力学, 高碘酸盐, 亚硫酸盐

Abstract: The complex kinetics of the reaction of periodate and sulfite has been investigated. This is a novel periodate-based oscillator. In excess of sulfite and in acidic medium(pH< 3), batch single-peak phenomena and CSTR sustained oscillations of Pt 、I- and pH potential, and the complex dynamics in a semibatch are obtained, while the alternative change of color from colorless to brown is also observed. The oscillation behavior is related to [KIO4]0/[Na2SO3]0 ratio and acidity. A possible reaction mechanism, which consists of an autocatalytic production of H+(positive feedback) and a H+-consuming pathway (negative feedback), along with the production and elimination of iodine, could fairly explain the complex dynamical behavior.

Key words: Chemical oscillation, Complex kinetics, Periodate, Sulfite