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Chemical Research in Chinese Universities ›› 2001, Vol. 17 ›› Issue (3): 299-304.

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Bioscillation and Birhythmicity in the H2O2-KSCN-CuSO4-NaOH System

GAO Qing-yu1, SUN Kang1, MENG Fan-yong1, CAI Zun-sheng2, ZHAO Xue-zhuang2   

  1. 1. College of Chemical Engineering, China University of Mining and Technology, of Mining and Technology, Xuzhou 221008, P. R. China;
    2. Department of Chemistry, Nankai University, Tianjin 300071, P. R. China
  • Received:2000-08-10 Online:2001-08-24 Published:2011-08-04
  • Supported by:

    Supported by NSFC(29573109) and Research fund of CUMT.

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Abstract: Two kinds of different mechanistic oscillations can be displayed in the H2O2-KSCN-CuSO4 NaOH system.One discovered by this study is the pH oscillation in a continuous flow stirred tank reactor(CSTR) resulting from the oxidation of KSCN.The other is the oscillation of H2O2 experimental conditions, the system exhibits a birhythmicity in a CSTR.Two different pH oscillations are reported here.The pH oscillations which accompany the decomposition of H2O2 exist in the batch reactor and the CSTR at a high flowrate, but the pH oscillations in a CSTR at a low flowrate originates from proton positive and negative feedback in the oxidation of KSCN.The os-cillation of non-catalyzed oxidation of KSCN by hydrogen peroxide in a CSTR can be found.Also we have observed whether Cu2+ exists or not in the batch system, the pH increases to near neutral ultimately after pH drops twice.

Key words: Bioscillation and birhythmicity, pH oscillation, H2O2 decomposition