Sorption and Oxidative Degradation of Small Organic Molecules on Mn-Oxides-Effects of pH and Mineral Structures

Li, Hui; Atkins, Benjamin; Williams, Sarah; Yin, Hui; Reinhart, Benjamin; Herndon, Elizabeth

doi:10.1021/acsearthspacechem.4c00166

Sorption and Oxidative Degradation of Small Organic Molecules on Mn-Oxides-Effects of pH and Mineral Structures

Journal Article · Thu Sep 19 04:00:00 EDT 2024 · ACS Earth and Space Chemistry

DOI:https://doi.org/10.1021/acsearthspacechem.4c00166· OSTI ID:2475715

^[1]; Atkins, Benjamin ^[1]; Williams, Sarah ^[2]; ^[3]; ^[4]; ^[5]

North Carolina State University, Raleigh, NC (United States)
North Carolina State University, Raleigh, NC (United States); Rochester Inst. of Technology, Rochester, NY (United States)
Huazhong Agricultural University, Wuhan (China)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Manganese (Mn)-oxides regulate carbon (C) cycling in soils by sorbing and oxidizing organic compounds. The composition of soil organic matter varies widely, and little is known about the reactivity of individual organic compounds with structurally diverse Mn-oxides under various environmentally relevant pH conditions. Here, in this study, we examined the affinity of six organic compounds for three Mn-oxides, comprised of layer (birnessite and hydrous Mn oxide HMO) or tunnel (cryptomelane) structures, at acidic (pH 4), slightly acidic (pH 6), and slightly alkaline (pH 8) conditions. Cryptomelane, with a higher specific surface area and point of zero charge, showed higher reactivity than that of HMO and birnessite. Interestingly, these Mn-oxides, although different in structures, decomposed each organic compound to form the same products. Citrate, pyruvate, ascorbate, and catechol induced reduction and dissolution of Mn-oxides. After the reaction, the average oxidation state of Mn in the solids was much lower at pH 4 than at pH 6 and 8, suggesting more reduction under more acidic conditions. Even when reacting with phthalate and propanol, which only sorbed to Mn-oxides but did not degrade, there was proton-promoted Mn dissolution under acidic conditions. These results suggest the significance of environmental pH and mineral structures in affecting the Mn–organic interactions and provide fundamental insights into a better understanding of the roles of Mn-oxides in regulating soil C cycling.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 2475715

Journal Information:: ACS Earth and Space Chemistry, Journal Name: ACS Earth and Space Chemistry Journal Issue: 10 Vol. 8; ISSN 2472-3452

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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