高碘酸盐-硫脲-硫酸反应体系的非线性动力学  

Nonlinear Dynamics in KIO_4-SC(NH_2)_2-H_2SO_4 Reaction System

作　　者：王舜[1] 林娟娟[1] 黄振炎[1] 高庆宇[2] 赵敏 林振权 

机构地区：[1]温州师范学院化学系,浙江温州325027 [2]中国矿业大学化工学院,徐州221008

出　　处：《物理化学学报》2002年第3期264-267,共4页Acta Physico-Chimica Sinica

基　　金：浙江省教育厅自然科学基金(981202);温州市"551"人才工程基金资助项目~~

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犤KIO4犦0/犤SC(NH2)2犦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.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 0/0 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.

关 键 词：振荡 准振荡 非线性动力学 高碘酸盐 硫脲 硫酸 反应体系 反应动力学 

分 类 号：O643.1[理学—物理化学]