物理化学学报 >> 2002, Vol. 18 >> Issue (03): 264-267.doi: 10.3866/PKU.WHXB20020315

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高碘酸盐-硫脲-硫酸反应体系的非线性动力学

王舜;林娟娟;黄振炎;高庆宇;赵敏;林振权   

  1. 温州师范学院化学系,浙江 温州 325027;中国矿业大学化工学院,徐州　221008
  • 收稿日期:2001-08-06 修回日期:2001-10-17 发布日期:2002-03-15
  • 通讯作者: 王舜 E-mail:wang3com@163.com

Nonlinear Dynamics in KIO4-SC(NH2)2-H2SO4 Reaction System

Wang Shun;Lin Juan-Juan;Huang Zhen-Yan;Gao Qing-Yu;Zhao Min;Lin Zhen-Quan   

  1. Wenzhou Normal College,Wenzhou　325027;China University of Mining and Technology,College of Chemical Engineering,Xuzhou　221008
  • Received:2001-08-06 Revised:2001-10-17 Published:2002-03-15
  • Contact: Wang Shun E-mail:wang3com@163.com

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摘要： 研究了KIO4SC(NH2)2H2SO4反应体系在封闭、半封闭以及开放系统中的非线性动力学行为.发现在封闭体系中体系的吸光度、铂电极电位和pH值呈现单峰或准振荡现象；在半封闭和开放系统中体系的铂电极电位和碘电极电位均呈振荡现象.封闭、半封闭及开放系统的动力学曲线受体系酸度和初始浓度比值[KIO4]0/[SC(NH2)2]0的影响.对照其在封闭、半封闭和开放系统中的动力学行为,以碘单质产生和消耗驱使的反应动力学可解释该反应体系的复杂现象.

关键词: 振荡, 准振荡, 非线性动力学, 高碘酸盐, 硫脲

Abstract: The reaction between periodate and thiourea has been studied in batch,semibatch reactor and CSTR (continuous stirredtank reactor).A new periodate oscillator has been found.The nonlinear reaction system displays a single peak or oligooscillations concerning the change of pH,Pt potential and iodine absorption in batch.While,oscillations of potential on Pt and Iselective electrodes are observed in CSTR and semibatch .The oscillation behavior is dependent on [KIO4]0/[SC(NH2)2]0 ratio and the initial concentration of acid.A preliminary mechanism based on the valence change of iodine may explain the kinetic phenomena in the present reaction system.

Key words: Oscillation, Oligooscillation, Nonlinear dynamics, Periodate, Thiourea