Manganese oxides and their application to metal ion and contaminant removal from wastewater

Islam, Md. Aminul; Morton, David W.; Johnson, Bruce B.; Mainali, Bandita; Angove, Michael J.

doi:10.1016/j.jwpe.2018.10.018

Cited by 127 publications

(41 citation statements)

References 229 publications

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“…Mn‐oxides including δ‐MnO 2 exist in high concentrations in the authigenic FeMn oxyhydroxide fraction accessed by our leaching process. This affinity is so important that the use of manganese oxides is highly encouraged for remediation of Pb‐contaminated soils and wastewater across a wide range of pH (Gasparatos, ; Islam et al, ; Komárek et al, ).…”

Section: Resultsmentioning

confidence: 99%

Precessional Cyclicity of Seawater Pb Isotopes in the Late Miocene Mediterranean

Modestou

Gutjahr

Schee

et al. 2019

Paleoceanog and Paleoclimatol

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Astronomical tuning in the Mediterranean region is primarily based on organically-mediated proxies, such as cyclicity of organic rich layers or changes in foraminiferal assemblages. Both during and post deposition, organic proxies can be affected by complex processes not immediately related to the changes in precession (insolation) they are assumed to reflect. Here we present an isotopic proxy which exhibits precessional cyclicity yet is inorganic. Seawater lead (Pb) isotope records over four precessional cycles between 6.6 and 6.5 Ma, from bulk sediment leachates of three Messinian, circum-Mediterranean marginal locations, show variations consistent with precessional cyclicity. During insolation minima, the Pb isotope signatures from all three sites converge to similar values, suggesting a regional process is affecting all three locations at that time. Data from the marginal sites are compared with new data from ODP Site 978 and published data from a variety of geological archives from the Mediterranean region to determine the mechanism(s) causing the observed variability. While the comparisons are not fully conclusive, the timing of events suggest that increased dust production from North Africa during insolation minima is the most likely control. This hypothesis implies that authigenic marine Pb isotope records have the potential to provide a reliable inorganic tie point for Mediterranean cyclostratigraphy where sub-precessional resolution is required. An inorganic tie point could also provide the means to resolve long-standing problems in Mediterranean stratigraphy on precessional and sub-precessional timescales which have been obscured due to post-depositional changes (e.g., sapropel burn-down) or suboptimal ecological conditions (e.g., the Messinian Salinity Crisis). Plain Language SummaryResearch into the geological and climate history of the Mediterranean region has been important globally, partly because the geologic timescale, back to about 23 million years ago, is pinned to the geological record of this region and partly because the water exiting the Mediterranean into the Atlantic is an important component of global ocean circulation. In this paper, we examine changes through time in the isotope ratios of the trace metal lead (Pb), which is present in tiny amounts even in unpolluted seawater. Our Pb isotope records, covering~100 thousand years at about 6.5 million years ago, show distinctive regular cyclicity with time, with "peaks" at approximately 20 thousand year intervals. We hypothesize that wet-dry climate cycles in North Africa produced these peaks by supplying more dust to the Mediterranean during the driest part of the cycle, when Pb from dust would have more strongly influenced the seawater Pb isotope composition. This hypothesis is exciting because it suggests that seawater Pb isotopes have the potential to improve our understanding of the passage of time in the Mediterranean region, in particular at times and locations where existing techniques are inadequate.

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Section: Resultsmentioning

confidence: 99%

Precessional Cyclicity of Seawater Pb Isotopes in the Late Miocene Mediterranean

Modestou

Gutjahr

Schee

et al. 2019

Paleoceanog and Paleoclimatol

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“…Therefore, this study considers manganese sand filter material as the main adsorption carrier. By grafting a small amount of Fe 3 O 4 to the manganese sand filter, the adsorption site of the material can be increased, improving Sb adsorption on the surface of the manganese sand filter (Islam et al, 2018). Compared with other synthetic filters, the composite manganese-Fe 3 O 4 sand filter can be prepared without complicated synthesis process.…”

Section: Performance Of the Manganese Sand Filter Materials Mixed Withmentioning

confidence: 99%

Enhanced removal of antimony in dyeing wastewater by mixing Fe₃O₄ with manganese sand filter material

Liu

Ying

Cong-yu

et al. 2020

Water Environment Research

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Wastewaters from the printing and dyeing industries contain many contaminants in particular antimony (Sb) that end up in the environment. Both manganese sand filter and Fe 3 O 4 have good removal effect on Sb, and are cheap and easy to obtain. We made a filter material by mechanically mixing the manganese sand filter material and ferro-ferric oxide (Fe 3 O 4). The Fe-Mn oxide filter material was analyzed by X-ray diffraction. We studied the filtration of real wastewater from a dyeing wastewater resource recovery facility in Suzhou, China, containing Sb at high concentration of 410 μg/L, using dynamic tests in adsorption columns during 7 days. We tested the effects of filter material volume filling ratio, the empty bed contact time (EBCT), pH, and back washing on the removal of Sb. Results show that the addition of Fe 3 O 4 enhanced the removal of Sb, reaching 85% of initial Sb. When the initial influent pH of the raw water is 3.0, the volume filling ratio of filter material is 60%, the EBCT is 20 min, and the developed dynamic Fe-Mn oxide filter has the best removal effect on Sb. Daily back washing of the filter keeps a Sb removal rate of about 80%. © 2020 Water Environment Federation • Practitioner points • A novel and cheap Fe-Mn oxide was developed for Sb removal from dyeing wastewater. • A self-designed filter device was designed to verify performance of the low-cost material. • Optimal design and operational parameters of the filtration process were determined.

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“…In the literature, the interaction of the surfaces of amphoteric metal oxides, which also include TiO 2 , ZnO, SnO 2 , ZrO 2 , and Fe 3 O 4 , with water in aqueous medium, is described by a simplified mechanism [98][99][100][101]:…”

Section: Surface Phenomena On Metalmentioning

confidence: 99%

Metaloxide Nanomaterials and Nanocomposites of Ecological Purpose

Dontsova

Nahirniak

Астрелін

2019

Journal of Nanomaterials

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The features of the properties and creation of nanocomposite metal oxide materials, especially TiO2, ZnO, SnO2, ZrO2, and Fe3O4, and their applications for ecology are considered in the article. It is shown that nanomaterials based on them are very promising for use in the ecological direction, especially as sorbents, photocatalysts, and sensitive layers of gas sensors. The crystallochemical characteristics, surface structure, and surface phenomena that occur when they enter the water and air environment are given for these metal oxides, and it is shown that they play a significant role in obtaining the sorption and catalytic characteristics of these nanomaterials. Particular attention is paid to the dispersion and morphology of metal oxide particles by which their physical and chemical properties can be controlled. Synthesis methods of metal oxide nanomaterials and ways for creating of nanocomposites based on them are characterized, and it is noted that there are many methods for obtaining individual nanoparticles of metal oxides with certain properties. The main task is the correct selection and testing of parameters. The prospects for the production of metal oxide nanocomposites and their application for environmental applications are noted, which will lead to a fundamentally new class of materials and new environmental technologies with their participation.

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Manganese oxides and their application to metal ion and contaminant removal from wastewater

Cited by 127 publications

References 229 publications

Precessional Cyclicity of Seawater Pb Isotopes in the Late Miocene Mediterranean

Precessional Cyclicity of Seawater Pb Isotopes in the Late Miocene Mediterranean

Enhanced removal of antimony in dyeing wastewater by mixing Fe₃O₄ with manganese sand filter material

Metaloxide Nanomaterials and Nanocomposites of Ecological Purpose

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Manganese oxides and their application to metal ion and contaminant removal from wastewater

Cited by 127 publications

References 229 publications

Precessional Cyclicity of Seawater Pb Isotopes in the Late Miocene Mediterranean

Precessional Cyclicity of Seawater Pb Isotopes in the Late Miocene Mediterranean

Enhanced removal of antimony in dyeing wastewater by mixing Fe3O4 with manganese sand filter material

Metaloxide Nanomaterials and Nanocomposites of Ecological Purpose

Contact Info

Product

Resources

About

Enhanced removal of antimony in dyeing wastewater by mixing Fe₃O₄ with manganese sand filter material