Progressive Nickel Incorporation into Fungal and Abiotic Manganese Oxides with Aging

• DOI: 10.1021/acsestwater.4c00967
• Publication Date: 2025-03-19T14:32:20Z
• Authors: Margaret A. G. Hi...; Carla E. Rosenfeld; Sarah G. Teagle; Jeffrey E. Post; Cara M. Santelli

Manganese oxides influence Ni partitioning in natural and metal-polluted systems through adsorption incorporation. Understanding behavior within environmental contexts requires knowledge of its binding to environmentally relevant minerals such as birnessite during after precipitation. Here, we compare at initial (48-h) aged (14-day) time frames onto fungal (via Stagonospora sp. SRC1lsM3a) abiotic birnessite, fungi are important Mn oxidizers contaminated sites, with two timing-of-addition scenarios: reacting preformed coprecipitation. X-ray absorption spectra were collected track the mineral structures modes. Aging birnessites reacted increase hexagonal sheet symmetry average oxidation state (AMOS), while coprecipitation yields similar (and stable) structures. also shifts from biomass- edge-bound sites systems, respectively, above vacancies incorporating into structure. Incorporated is positively correlated AMOS Mn(IV) content, both fungal- abiotic-aged samples achieving 2.3 mol % (mol Ni:mol Mn) incorporation, albeit different scenarios. These results suggest an equilibrium structure for Ni-substituted phyllomanganates, biomass acting sinks sources systems.