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Interactions between MnO₂ and tire wear particles: Mutual impacts on aging and MnO₂ structural transformation.
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Researchers investigated how three manganese oxide phases interact with tire wear particles and found a synergistic effect with photoaging that raised the oxidation ratio of TWPs by 66%—more than the sum of either process alone—while dissolved organic matter released from aged TWPs in turn inhibited manganese oxide structural transformation, revealing a two-way geochemical feedback in aquatic environments.
Manganese oxides (MnO), as ubiquitous and reactive minerals, play a crucial role in pollutant transformation within aqueous environments. However, the interactions between MnO and tire wear particles (TWPs) remain inadequately understood. Specifically, it is hypothesized that MnO may accelerate TWPs aging, consequently leading to the release of dissolved organic matter from aged TWPs (TWPs-DOM), which in turn could mediate MnO structural transformation. Herein, we present a comprehensive investigation into the interactions between TWPs and MnO of varying phases (α-, γ-, and δ-MnO). Our findings reveal a synergistic effect of MnO and photoaging on TWPs aging. For example, the combined effects of α-MnO₂ and photoaging resulted in a 66% increase in the O/C ratio of TWPs, which exceeds the sum of the increases observed for the UV irradiation-only (20%) and α-MnO₂-only (12%) treatments. The observed phase-dependent acceleration of TWPs aging by MnO is governed by the inherent oxidative potential, electron transport capabilities, and surface charge of the respective MnO phases. Concurrently, a 21-day experimental observation demonstrated a hindering effect of TWPs-DOM on MnO structural transformation. Subsequent analysis elucidated that this inhibitory effect was predominantly controlled by the TWPs-DOM with higher aromaticity and higher molecular weight. Collectively, these findings offer a novel perspective on the critical significance of considering the mutual effects between TWPs and MnO when evaluating the transformation and environmental fate of both entities within aquatic systems.
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