Oxidation of Substituted Anilines by Aqueous MnO2: Effect of Co-Solutes on Initial and Quasi-Steady-State Kinetics

摘要: The effect of pH, Mn(II), and humic acid (HA) concentration as well aromatic ring substituents on initial quasi-steady-state rates oxidation monosubstituted anilines by MnO2 has been investigated in batch completely mixed flow-through reactors. reaction were strongly pH-dependent increased with decreasing pH. Ca(II), HA, other organic solutes inhibited the substituted anilines. Inhibition adsorbed Mn(II) was due to blocking reactive Mn(IV) surface sites. inhibitory HA some part reductive dissolution and, thus, formation Mn(II). Initial a series linearly correlated polarographic half-wave potentials, E1/2, indicating that electron-transfer kinetics relevant for overall rate oxidation. However, results from experiments demonstrate such correlations may change or disappear, s...