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MnO2 Structural Polymorph-Mediated Interaction with Dissolved Organic Matter: Underlying Protection and

Zhiqiang Wang1,2, Zihan Shi1,2, Tiantian Xu1,2

  • 1College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China.

Environmental Science & Technology
|December 5, 2025
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Summary

The crystal structure of manganese dioxide (MnO2) significantly impacts dissolved organic matter (DOM) protection and transformation. Different MnO2 phases influence DOM stability and degradation pathways, affecting environmental fate.

Keywords:
MnO2dissolved organic matterprotectionreactive oxygen speciestransformation

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Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Material Science

Background:

  • Manganese dioxide (MnO2) is crucial for dissolved organic matter (DOM) cycling.
  • The diverse solid-phase speciation of MnO2 complicates understanding DOM-mineral interactions.

Purpose of the Study:

  • Investigate the adsorption, protection, and transformation of DOM by various MnO2 polymorphs.
  • Determine the influence of MnO2 phase structure and properties on DOM fate.

Main Methods:

  • Comparative analysis of DOM interactions with different MnO2 polymorphs (α-, β-, δ-MnO2).
  • Assessment of DOM adsorption capacity based on specific surface area.
  • Evaluation of DOM protection and transformation mechanisms, including reactive oxygen species (ROS) generation and redox reactions.

Main Results:

  • Higher specific surface area of MnO2 correlated with increased DOM adsorption.
  • δ-MnO2 provided superior DOM protection via physical entrapment within its layered structure.
  • α- and δ-MnO2 generated reactive oxygen species (ROS), transforming DOM into smaller molecules or inorganic carbon.
  • β-MnO2 showed minimal ROS production, instead oxidizing DOM via Mn4+ redox, yielding mid- to high-molecular-weight compounds.

Conclusions:

  • MnO2 crystal structure is a key regulator of DOM protection.
  • The abundance of Mn4+ and ROS dictates DOM transformation pathways.
  • Findings offer critical insights into the environmental fate of DOM influenced by MnO2.