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.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
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~~
