The permanganate/bisulfite (PM/BS) process oxidized phenol, ciprofloxacin, and methyl blue at pHini 5.0 with rates (kobs ≈ 60-150 s−1) that were 5-6 orders of magnitude faster than those measured for permanganate alone, and ~5 to 7 orders of magnitude faster than conventional advanced oxidation processes for water treatment. The reactive intermediate responsible for the extremely rapid oxidation of organic contaminants in the PM/BS process was determined to be Mn(III) species with minimal stabilization. A Mn(III) generation and utilization model and a competition kinetics method were developed to obtain the second-order rate constants of organic contaminants oxidation by soluble Mn(III). The results revealed that the second-order rate constants of aniline and bisphenol A oxidation by soluble Mn(III) were in the range of 105-106 M-1s-1. With the presence of soluble Mn(III) at micromolar concentration, contaminants could be oxidized with observed rate several orders of magnitude higher than those by common oxidation processes.

Activation of manganese oxidants with bisulfite for enhanced oxidation of organic contaminants: The involvement of Mn(III)

253rd National Meeting (2017)

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