Soil Manganese Oxides

Dixon, J. B.; Golden, D. C.; Uzochukwu, G. A.; Chen, C. C.

doi:10.1007/978-1-4899-2611-1_7

Cited by 9 publications

(7 citation statements)

References 29 publications

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“…Synthetic birnessite and cryptomelane with controllable phases and shapes are used, given that natural Mn(IV) (hydr)oxides usually occur as agglomerates with complex compositions and coexist with other minerals. 24 The obtained results are beneficial for understanding the fate of biogenic isoprene in the environment and shed light on the vital role of Mn(IV) (hydr)oxides in the transfer and transformation of environmental substances.…”

Section: Introductionmentioning

confidence: 94%

“…Herein, the adsorption and oxidation of isoprene on birnessite and cryptomelane at ambient temperature are investigated, with emphasis on the effects of mineral structure and morphology on reactivity, the influence of environmental factors on adsorption–-oxidation performance, and the interaction mechanism. Synthetic birnessite and cryptomelane with controllable phases and shapes are used, given that natural Mn(IV) (hydr)oxides usually occur as agglomerates with complex compositions and coexist with other minerals . The obtained results are beneficial for understanding the fate of biogenic isoprene in the environment and shed light on the vital role of Mn(IV) (hydr)oxides in the transfer and transformation of environmental substances.…”

Section: Introductionmentioning

confidence: 99%

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Different Reactivity of Birnessite and Cryptomelane toward Isoprene: Effect of Structure, Morphology, and Exposed Faces

et al. 2022

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This study investigates the adsorption and oxidation of isoprene, the most abundant biogenic volatile organic compound, on two common Mn(IV) (hydr)oxides in Earth's surface environment, birnessite and cryptomelane. Both minerals show high adsorption capability toward isoprene under increasing environmental temperature and low relative humidity, whereas the adsorbed isoprene on birnessite is oxidized into carboxylate species, mainly formate. For both Mn(IV) (hydr)oxides, the adsorption of isoprene not only reduces Mn 4+ to Mn 3+ but also gives rise to the slight distortion of the crystal structure. Compared to cryptomelane, birnessite exhibits better adsorption and oxidation capability of isoprene, which is improved by the decrease in crystallinity. This is attributed to the high density of oxygen anions on the (001) surface, owing to the participation of lattice oxygen, electrophilic adsorbed oxygen, and hydroxyl groups in the oxidation of isoprene. For cryptomelane, the particles with short and thick nanorods show higher adsorption capacity but lower oxidizability than those with long and sharp nanorods, as the (001) surface of cryptomelane prefers to adsorb isoprene and Mn 4+ in long sharp nanorods and accept more electrons from isoprene. Based on the experimental results, we propose that Mn(IV) (hydr)oxide in soil dust aerosols is an important regulator of atmospheric isoprene, which enhances the bioavailability of both isoprene and Mn(IV) (hydr)oxides.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Different Reactivity of Birnessite and Cryptomelane toward Isoprene: Effect of Structure, Morphology, and Exposed Faces

et al. 2022

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“…Microprobe analysis reveals that birnessite contains up to 4 wt.% zinc. Zinc ions are able to interchange with the structural Mn 2÷ of the birnessite (Dixon et al 1990). …”

Section: Solid Substancesmentioning

confidence: 99%

“…The hydrous manganese oxides also contain approximately 1% calcium which compensates the net negative particle charge (pHzpc_MnO2 ~ 2.8; Dixon 1990) and therefore supports a quick coagulation of the particles (Posselt et al 1968). The manganese oxide aggregates in deeper regions of the mud are always covered by a small ferrihydrite layer (dried: thickness ~ 10 ~m) or they are totally imbedded in ferrihydrite (see Fig.…”

Section: Solid Substancesmentioning

confidence: 99%

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Self-organization of recent rhythmic iron-manganese precipitations in underground mines in the Harz mountains

Dietrich

Jacob

1996

Geol Rundsch

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A recent early diagenetic banded iron-manganese mud has been forming underground in a closed lead-zinc mine for approximately 40 years. The processes leading to the banded structure of the precipitate were studied during a period of 2 years. Therefore, 19 physical and chemical parameters were measured regularly in short intervals. The resulting time series were analysed with respect to the data sets of the monthly chemical analyses of the descendent mine water, the daily rainfall and the mineral content. The results reveal that the precipitated material undergoes internal self-organization due to interaction of redox, colloidchemical, microbial, electrical and ripening processes, and not exclusively produced by seasonal fluctuations of material input. Thus, the primary banding of the material, caused by externally forced fluctuations of the redox conditions within the mine water, is reorganized after a short time. The finally observed bands are controlled by non-linear coupling of reaction and transport processes within the mud. A genetic model for the banded mineralization was developed and verified by numerical simulation.

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Identification of factors associated with Fasciola hepatica infection risk areas on pastures via an environmental DNA survey of Galba truncatula distribution using droplet digital and quantitative real‐time PCR assays

et al. 2022

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Soil Manganese Oxides

Cited by 9 publications

References 29 publications

Different Reactivity of Birnessite and Cryptomelane toward Isoprene: Effect of Structure, Morphology, and Exposed Faces

Different Reactivity of Birnessite and Cryptomelane toward Isoprene: Effect of Structure, Morphology, and Exposed Faces

Self-organization of recent rhythmic iron-manganese precipitations in underground mines in the Harz mountains

Identification of factors associated with Fasciola hepatica infection risk areas on pastures via an environmental DNA survey of Galba truncatula distribution using droplet digital and quantitative real‐time PCR assays

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