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  • Title: Activation of Bisulfite with Pyrophosphate-Complexed Mn(III) for Fast Oxidation of Organic Pollutants.
    Author: Guo Q, Qi X, Zhang J, Sun B.
    Journal: Int J Environ Res Public Health; 2022 Aug 01; 19(15):. PubMed ID: 35954793.
    Abstract:
    Aqueous complexes of Mn(III) ion with ligands exist in various aquatic systems and many stages of water treatment works, while HSO3- is a common reductant in water treatment. This study discloses that their encounter results in a process that oxidizes organic contaminants rapidly. Pyrophosphate (PP, a nonredox active ligand) was used to prepare the Mn(III) solution. An approximate 71% removal of carbamazepine (CBZ) was achieved by the Mn(III)/HSO3- process at pH 7.0 within 20 s, while negligible CBZ was degraded by Mn(III) or HSO3- alone. The reactive species responsible for pollutant abatement in the Mn(III)/HSO3- process were SO4•- and HO•. The treatment efficiency of the Mn(III)/HSO3- process is highly related to the dosage of HSO3- because HSO3- acted as both the radical scavenger and precursor. The reaction of Mn(III) with HSO3- follows second-order reaction kinetics and the second-order rate constants ranged from 7.5 × 103 to 17 M-1 s-1 under the reaction conditions of this study, suggesting that the Mn(III)/HSO3- process is an effective process for producing SO4•-. The pH and PP:Mn(III) ratio affect the reactivity of Mn(III) towards HSO3-. The water background constituents, such as Cl- and dissolved organic matter, induce considerable loss of the treatment efficiency in different ways.
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