Manganese oxides are considered to be one of the strongest naturally occurring oxidants in near surface environments. These minerals can oxidize several classes of inorganic and organic contaminants, including those with phenolic functional groups. As a result, manganese oxides such as MnO2 influence contaminant fate in natural soils and may be a key driver of reactivity and contaminant fate in natural waters interfacing Mn-enriched soils. Furthermore, manganese oxides have also been proposed for the passive, in situ treatment of pollutants in stormwater, landfill leachate, and other contaminated surface waters. These water and soil interfaces are complex matrices containing a variety of organic contaminants, inorganic ions, and dissolved organic matter (DOM), which may interact with manganese oxides through sorption, redox reactions, complexation, and other mechanisms. This study evaluates the ability of synthetic birnessite and reclaimed Mn oxides to oxidize a series of phenolic compounds by both sorption-limited and electron transfer-limited reaction pathways. These compounds range from simple model phenols to complex environmental contaminants including antimicrobial agents (4-cresol, triclosan), endocrine disruptors (bisphenol A, estrone, 17β-estradiol), and surfactants (4-n-nonylphenol, 4-tert-octylphenol). The rates and rate-limiting steps of phenolic contaminant oxidation are used as a metric to mechanistically investigate the interactions between organic carbon and Mn oxide materials. The role of contaminant substituents, manganese characteristics, and water composition are investigated. The results of this study suggest that complexities in near surface environments mechanistically impact contaminant degradation by manganese oxides.

Influence of phenolic structure on contaminant oxidation by manganese oxides in complex matrices

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.