期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 113, 期 7, 页码 1231-1234出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp807802v
关键词
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资金
- U.S. National Science Foundation [CHE-0615507]
- NSFC [20573134]
- NCET [05-0477]
- JSNSF [BK2007037]
- Chinese Scholarship Council
Sustained oscillations in pH and redox potential are found in the chlorite-sulfide reaction in a continuous-flow stirred tank reactor (CSTR). Autocatalytic oxidation of HSO3- by ClO2- is the major source of positive feedback of hydrogen ions. The reaction between H2S and ClO2- to form S-8, which consumes H+, is an important source of negative feedback. A model consisting of five protonation-deprotonation equilibria and nine redox reactions is proposed for the oscillatory reaction between S2- and ClO2-. The 10 species included are HS-, H2S, S2O32-, HSO32-, HSO3-, OCl-, HOCl, ClO2-, H+, and OH-. In contrast to the H2O2-S2- oscillatory reaction, S2O32- is shown here by capillary electrophoresis to be an important intermediate. Simulations give qualitative agreement with the pH oscillatory behavior observed in the CSTR.
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