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A Kinetic Study of Lodine Molecule Oxidation by Aqueous Hydrogen Peroxymonosulfate

過氧硫酸氫根離子氧化碘分子的反應動力學

摘要


過氧硫酸氫根離子氧化碘分子成碘酸根離子的反應,依擬一級動力學的方式(過氧硫酸氫根離子過量),在25℃、pH值範圍為2.71-3.62的水溶液中完整地被探討。碘分子消失的速率分別與過氧硫酸氫根離子及碘分子的濃度成比,且水溶液中的pH值增加反應速率增快。此反應的反應速率定律式為:-(d[I2])/dt=k[HSO5^-]r[I2]其中k=(k1[H^+])/([H^+]+Ka2)+(k2Ka2)/([H^+]+Ka2),Ka2是H2SO5的第二解離常數,k1 = 0.57 M^(-1)s^(-1)、k2 = 3.01 × 10^6 M^(-1)s^(-1)。

並列摘要


This study investigated the peroxymonosulfate oxidation of iodine to iodate under pseudo-first-order conditions (with excess HSO5^-) in buffered aqueous solutions at pH 2.71-3.62 at 25 °C. The rates of iodine decay are first order in both iodine and peroxymonosulfate ion concentrations and increase rapidly with increasing pH. The reaction can be described with the following rate law: -(d[I2])/dt=k[HSO5^-]r[I2], where k=(k1[H^+])/([H^+]+Ka2)+(k2Ka2)/([H^+]+Ka2), Ka2 is the second dissociation constant of H2SO5, k1 = 0.57 M^(-1)s^(-1), and k2 = 3.01 × 10^6 M^(-1)s^(-1).

並列關鍵字

Kinetics peroxymonosulfate iodine

延伸閱讀