Effect of Zn coprecipitation on the structure of layered Mn oxides

Zhao, Shiliang; Wang, Qian; Sun, Jingying; Borkiewicz, Olaf J.; Huang, Rixiang; Saad, Emily M.; Fields, Benjamin P.; Chen, Shuo; Zhu, Mengqiang; Tang, Yuanzhi

doi:10.1016/j.chemgeo.2018.05.044

Cited by 23 publications

(37 citation statements)

References 97 publications

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“…Based on previous studies and our recent study [37], when Zn is added during δ-MnO 2 formation, it exists as surface sorbed species, but can introduce significant structural modification. In order to compare the effects of Zn-coprecipitation-induced structural modification on δ-MnO 2 sorptive reactivity, we also conducted parallel experiments where pure δ-MnO 2 with Zn sorption (i.e., Zn-sorbed δ-MnO 2 , with Zn concentrations comparable to the coprecipitation system) were used as the sorbent, with the subsequent addition of Cd 2+ , phosphate, and arsenate as sorbate.…”

Section: Cation and Anion Sorption On Zn-sorbed δ-Mnomentioning

confidence: 91%

“…When Zn 2+ was added during the formation of biogenic MnO x , it was found to interrupt the mineral layer stacking [36]. Our recent study showed that the presence of Zn 2+ during abiotic δ-MnO 2 formation has more significant impacts on δ-MnO 2 structure compared to Zn sorption on pure δ-MnO 2 [37]. These studies demonstrate the significant effects of Zn 2+ treatment (either sorption or coprecipitation) on δ-MnO 2 structure, which can potentially affect the sorptive reactivity of δ-MnO 2 .…”

Section: Introductionmentioning

confidence: 98%

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Zinc Presence during Mineral Formation Affects the Sorptive Reactivity of Manganese Oxide

Zhao

Liu

et al. 2018

Soil Systems

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The sorptive reactivity of layered manganese (Mn) oxides is controlled by their layer and interlayer structure, which can be affected by processes such as metal coprecipitation. This study investigated the effects of Zn coprecipitation on the sorptive reactivity of δ-MnO 2 , a common layered Mn oxide mineral. Selected cation (i.e., Cd) and anion (i.e., phosphate and arsenate) species were used to probe the changes in δ-MnO 2 sorptive reactivity. Cd uptake by δ-MnO 2 was suppressed by Zn coprecipitation but total metal uptake (Cd and Zn) was enhanced, indicating more available vacancy sites (e.g., smaller particle size and higher vacancy site density) in Zn-coprecipitated δ-MnO 2. Phosphate and arsenate sorption on δ-MnO 2 was significantly enhanced by Zn-coprecipitation, and the enhancement was more effective compared to Zn sorption on pure δ-MnO 2. X-ray diffraction and X-ray adsorption spectroscopy analysis did not detect the formation of surface precipitations and/or ternary complexes. The enhanced anion sorption on Zn-coprecipitated δ-MnO 2 was likely due to the compensation of negative surface charge by sorbed Zn, as well as the structural modifications introduced by Zn coprecipitation. Results from this study can provide a better understanding on the interactions between metal-coprecipitated Mn oxides and other species in natural environments.

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Section: Cation and Anion Sorption On Zn-sorbed δ-Mnomentioning

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Zinc Presence during Mineral Formation Affects the Sorptive Reactivity of Manganese Oxide

Zhao

Liu

et al. 2018

Soil Systems

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“…These spectral differences were previously interpreted from the different AOS of Mn and the disparate symmetry of MnO 6 layers in the crystalline structures of δ-MnO 2 and triclinic birnessite. 8,28,29 The δ-MnO 2 phase has a hexagonal MnO 6 symmetry with a certain amount of vacant sites as well as an extremely low content and low ordering of Mn(III). 28,29 Triclinic birnessite possesses an orthogonal MnO 6 symmetry with no vacant sites as well as a relatively high content (∼33%) and high ordering of Mn(III).…”

Section: Acs Earth and Space Chemistrymentioning

confidence: 99%

“…8,28,29 The δ-MnO 2 phase has a hexagonal MnO 6 symmetry with a certain amount of vacant sites as well as an extremely low content and low ordering of Mn(III). 28,29 Triclinic birnessite possesses an orthogonal MnO 6 symmetry with no vacant sites as well as a relatively high content (∼33%) and high ordering of Mn(III). 30 Under such circumstances, the enrichment and ordering of Mn(III) in triclinic birnessite lead to the peak splitting, broadening, and shifting in the k 3 χ(k) spectrum.…”

Section: Acs Earth and Space Chemistrymentioning

confidence: 99%

“…It is worth noting that the k 3 χ(k) spectrum of δ-MnO 2 is comparable to that of H−birnessite, another kind of manganese oxide with hexagonal symmetry. 29 In view of this, one cannot eliminate the potential presence of H−birnessite in the ferromanganese nodules solely based on the oscillation characteristics in the k 3 χ(k) spectra. Nevertheless, the spectral features in the RSFs can provide more information to further identify the main manganese phase.…”

Section: Acs Earth and Space Chemistrymentioning

confidence: 99%

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Comparison of Arsenate and Molybdate Speciation in Hydrogenetic Ferromanganese Nodules

Yang

Uesugi

Qin

et al. 2018

ACS Earth Space Chem.

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Marine ferromanganese oxides contain a large amount of trace elements, such as arsenic (As) and molybdenum (Mo). However, the host phases of tetrahedral AsO 4 3− and MoO 4 2− oxyanions therein have not been clearly identified thus far. In this work, we explored the mineralogical components of hydrogenetic (HG) ferromanganese nodules and compared the distribution behaviors of As and Mo. The X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) analyses showed that the predominant manganese and iron phases were vernadite (δ-MnO 2 ) and ferrihydrite, respectively. According to the sequential extraction examination, both As and Mo were associated with the iron (oxyhydr)oxide phases. However, the XAS analyses indicated that As was retained by the ferrihydrite phase via double cornershared complexation, while Mo was preferentially adsorbed on δ-MnO 2 via edge-shared complexation. The immobilization of As and Mo by HG ferromanganese samples was attributed to specific chemical binding (ΔG chem ) rather than Coulombic interaction (ΔG coul ) as proposed in previous studies. The comparison of Mo XAS spectra before and after extraction revealed the unreliability of the sequential extraction approach to determine the host phase of trace elements as a result of the potential readsorption risk. The different distribution trends of As and Mo were due to their disparate intrinsic properties (e.g., averaged dissociation constants of conjugate acids) and the diverse properties (i.e., surface site densify, adsorption equilibrium constant, and crystalline structure) of ferrihydrite and δ-MnO 2 . These research findings would be significant for evaluating the geochemical behaviors and environmental fate of trace elements in marine systems.

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Facile preparation, characterization, and formaldehyde elimination performance of MnO_x/natural loofah composites

Feng

Zhang

et al. 2020

Env Prog and Sustain Energy

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MnO x /natural loofah composites were first prepared by a facile in-situ reduction process under ambient conditions, in which natural loofah was impregnated in potassium permanganate solution for different time. MnO x nanoparticles were loaded on both exterior and interior of the fibrous strands of loofah after impregnation from SEM observations. The crystal structure and chemical properties of MnO x in the composites were confirmed to birnessite-type MnO x with the interplanar spacing of 0.24 nm and Mn oxidation state of 3.6 by XRD, Raman, FTIR, TEM, and XPS. Such produced MO x /loofah composites showed excellent performance for the catalytic oxidative decomposition and adsorption of formaldehyde at room temperature. The composites prepared with longer impregnation time exhibited better catalytic performance. The decomposition mechanism of HCHO over the MO x /loofah composites involved adsorbed HCHO on the loofah was oxidized into intermediates first and further CO 2 by MnO x through in-situ DRIFTS analysis.

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Effect of Zn coprecipitation on the structure of layered Mn oxides

Cited by 23 publications

References 97 publications

Zinc Presence during Mineral Formation Affects the Sorptive Reactivity of Manganese Oxide

Zinc Presence during Mineral Formation Affects the Sorptive Reactivity of Manganese Oxide

Comparison of Arsenate and Molybdate Speciation in Hydrogenetic Ferromanganese Nodules

Facile preparation, characterization, and formaldehyde elimination performance of MnO_x/natural loofah composites

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Effect of Zn coprecipitation on the structure of layered Mn oxides

Cited by 23 publications

References 97 publications

Zinc Presence during Mineral Formation Affects the Sorptive Reactivity of Manganese Oxide

Zinc Presence during Mineral Formation Affects the Sorptive Reactivity of Manganese Oxide

Comparison of Arsenate and Molybdate Speciation in Hydrogenetic Ferromanganese Nodules

Facile preparation, characterization, and formaldehyde elimination performance of MnOx/natural loofah composites

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Facile preparation, characterization, and formaldehyde elimination performance of MnO_x/natural loofah composites