| Bioscillation and Birhythmicity in the H_2O_2-KSCN-CuSO_4-NaOH System |
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| 作者姓名： | GAO Qing-yu SUN Kang and MENG Fan-yong |
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| 作者单位： | GAO Qing-yu，SUN Kang and MENG Fan-yong (College of Chemical Engineering，China University of Mining and Technology，Xuzhou 221008，P. R. China) CAI Zun-sheng and ZHAO Xue-zhuang (Department of Chemistry，Nankai University，Tianjin 300071，P. R. China) To whom correspondence should be addressed. |
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| 基金项目： | Supported by NSFC(29573109) and Research fund of CUMT. |
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| 摘 要： | Two kinds of different mechanistic oscillations can be displayed in the H_2O_2-KSCN-CuSO_4-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 H_2O_2 decomposition in both CSTR and batch reactors(reported by Orbáin in 1986). Under appropriate 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 H_2O_2 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 oscillation of non-catalyzed oxidation of KSCN by hydrogen peroxide in a CSTR can be found. Also we have observed whether Cu~(2+) exists or not in the batch system, the pH increases to near neutral ultimately after pH drops twice.
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Bioscillation and Birhythmicity in the H2O2-KSCN-CuSO4-NaOH System |
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| GAO Qing-yu,SUN Kang and MENG Fan-yong.Bioscillation and Birhythmicity in the H_2O_2-KSCN-CuSO_4-NaOH System[J].Chemical Research in Chinese University,2001,17(3). |
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| Authors: | CAI Zun-sheng ZHAO Xue-zhuang |
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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. |
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| Keywords: | Bioscillation and birhythmicity pH oscillation H_2O_2 decomposition |
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