Sorption behavior of heavy metals on birnessite: Relationship with its Mn average oxidation state and implications for types of sorption sites

Wang, Yan; Feng, Xionghan; Villalobos, Mario; Tan, Wenfeng; Fan, Louzhen

doi:10.1016/j.chemgeo.2011.11.001

Cited by 169 publications

(108 citation statements)

References 37 publications

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“…This is consistent with recent results reported by 2D-IR correlation spectroscopy (Al Lafi and Al Abdullah 2015). According to the two-site heterogeneous model for site affinity, the adsorption maxima of ions investigated suggest a model where Co 2+ shows very limited access to the edge sites that have higher affinity/binding energy in comparison with interlayer sites (Wang et al 2012b). Yet, Fig.…”

Section: Adsorption Mechanismsupporting

confidence: 87%

Adsorption of Cesium, Cobalt, and Lead onto a Synthetic Nano Manganese Oxide: Behavior and Mechanism

Abdullah

Lafi

Masri

et al. 2016

Water Air Soil Pollut

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Synthesis parameters of nano manganese oxide (NMO) were tuned in order to maximize Cs and Co sorption efficiencies. The prepared oxide was characterized using various techniques including x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), SEM, and surface area analyzer. The sorption characteristics with respect to uptake of Cs, Co, and Pb were evaluated. An α − phase nano manganese oxide with a surface area of 165 m 2 g −1 was synthesized. Maximum adsorption capacities were 230 mg g −1 for Pb 2+ , 73 mg g −1 for Cs + , and 26 mg g −1 for Co 2+ . The intraparticle diffusion was the rate-limiting step in the case of Pb 2+ , whereas both intra-particle diffusion and film diffusion contribute to the rate-determining step in the adsorption process in the case of Cs + and Co 2+ . FT-IR analyses reveled that Cs + and Co 2+ coordinated to vacancy sites of NMO as inner-sphere complexes, while Pb 2+ formed bidentate corner-sharing complexes. NMO had high affinity for Pb 2+ but was also effective for sorption of Cs + and Co 2+ over a wide pH range, even in the presence of Na + . HCl (0.5 mol L −1 ) solution could regenerate the adsorbent successfully, and the NMO could be efficiently reused with lower production of residues. Thus, the prepared NMO can be efficiently used in wastewater treatment in terms of high adsorption capacity, easy availability, and low cost.

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Section: Adsorption Mechanismsupporting

confidence: 87%

Adsorption of Cesium, Cobalt, and Lead onto a Synthetic Nano Manganese Oxide: Behavior and Mechanism

Abdullah

Lafi

Masri

et al. 2016

Water Air Soil Pollut

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“…25,26 The majority of these studies have employed δ-MnO 2 as an analog for natural birnessite with hexagonal sheet symmetry and nanoscale dimensions. 1,9,14,27 The most common pathway for δ-MnO 2 synthesis is the "redox" method, which involves the oxidation of MnĲII) by MnĲVII) in an alkaline medium. 28 The nanoparticles obtained from the "redox" method are typically less than 10 nm across the ab plane and consist of 2 to 3 turbostratically stacked layers.…”

Section: Introductionmentioning

confidence: 99%

Crystal growth and aggregation in suspensions of δ-MnO₂nanoparticles: implications for surface reactivity

Marafatto

Lanson

Peña

2018

Environ. Sci.: Nano

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a Birnessite (layer-type Mn oxide) is a key reactive phase in soils and sediments and its sorption and oxidative properties render it attractive for use in technical applications. The most widely used synthetic analog of natural and biogenic birnessite in laboratory studies is nanocrystalline δ-MnO 2 . However, a wide range of physicochemical properties have been reported in the literature for δ-MnO 2 . In this study, we produced several batches of δ-MnO 2 and identified the mechanisms leading to significant variations in particle size, as probed by X-ray diffraction (3 to 7 nm), dynamic light scattering (85 to 501 nm) and N 2 Ĳg) BET specific surface area (SSA: 119 to 259 m 2 g −1) measurements. Both the coherent scattering domain (CSD) size in the ab plane and the wet-aggregate size decreased with increasing suspension pH and Na content, which is consistent with base-catalyzed oxidation and nucleation at high pH and growth by oriented attachment at low pH. The increase in the CSD size upon sample acidification but not basification provides further evidence for OA as a crystal growth mechanism. Finally, the sample SSA was not related to the crystallite size, but instead was inversely correlated to the suspension pH and Na : Mn content. The surface charge and counter-cation content of δ-MnO 2 control the aggregate structure, where low pH (low Na : Mn) favored high surface area structures and high pH (high Na : Mn) favored low surface area structures. The reversibility of SSA upon the acidification or basification of parent suspensions and the crystal growth only upon suspension acidification confirmed that the primary crystallite size and the aggregate/agglomerate size are highly sensitive to solution chemistry and surface charge and has direct implications for δ-MnO 2 nanoparticle reactivity towards organic and inorganic contaminants in environmental systems that can encompass a dynamic range of pH values and ionic compositions.

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“…These studies have concluded that decreased As(III) oxidation is due to competition from metal cations blocking the reactive sites on the Mn oxide surface. Mechanistically, metal sorption sites are located internally due to cation vacancies within MnO6 octahedral layers, or, externally at lateral edges of MnO2 sheets [46]. Until recently, it has been thought that sorption occurs predominately at internal cation vacancy sites.…”

Section: It Is Well Documented That the Mn Oxide Component Of Binary mentioning

confidence: 99%

In situ arsenic oxidation and sorption by a Fe-Mn binary oxide waste in soil

McCann

Peacock

Hudson‐Edwards

et al. 2018

Journal of Hazardous Materials

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In situ arsenic oxidation and sorption by a Fe-Mn binary oxide waste in soil., Journal of Hazardous Materialshttp://dx.doi.org/10. 1016/j.jhazmat.2017.08.066 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Graphical abstractHighlights  A Fe-Mn binary oxide waste is used to remediate As contaminated soils. As(III) and As(V) adsorption capacities of 70 mg g 1 and 32 mg g 1 were determined. The bioaccessibility of total As was significantly reduced by 7.80 %  Arsenic in the contaminated soil effectively binds to the exogenous binary oxide. As(V) was sorbed by mononuclear bidentate corner-sharing with Fe. AbstractThe ability of a Fe-Mn binary oxide waste to adsorb arsenic (As) in a historically contaminated soil was investigated. Initial laboratory sorption experiments indicated that arsenite [As(III)] was oxidized to arsenate [As(V)] by the Mn oxide component, with concurrent As(V) sorption to the Fe oxide. The binary oxide waste had As(III) and As(V) adsorption capacities of 70 mg g 1 and 32 mg g 1 respectively. X-ray Absorption Near-Edge Structure and Extended X-ray Absorption Fine Structure at the As K-edge confirmed that all binary oxide waste surface complexes were As(V) sorbed by 3 mononuclear bidentate corner-sharing, with 2 Fe at ~ 3.27 Ǻ The ability of the waste to perform this coupled oxidation-sorption reaction in real soils was investigated with a 10% by weight addition of the waste to an industrially As contaminated soil. Electron probe microanalysis showed As accumulation onto the Fe oxide component of the binary oxide waste, which had no As innately. The bioaccessibility of As was also significantly reduced by 7.80 % (p < 0.01) with binary oxide waste addition. The results indicate that Fe-Mn binary oxide wastes could provide a potential in situ remediation strategy for As and Pb immobilization in contaminated soils.

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Sorption behavior of heavy metals on birnessite: Relationship with its Mn average oxidation state and implications for types of sorption sites

Cited by 169 publications

References 37 publications

Adsorption of Cesium, Cobalt, and Lead onto a Synthetic Nano Manganese Oxide: Behavior and Mechanism

Adsorption of Cesium, Cobalt, and Lead onto a Synthetic Nano Manganese Oxide: Behavior and Mechanism

Crystal growth and aggregation in suspensions of δ-MnO₂nanoparticles: implications for surface reactivity

In situ arsenic oxidation and sorption by a Fe-Mn binary oxide waste in soil

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Sorption behavior of heavy metals on birnessite: Relationship with its Mn average oxidation state and implications for types of sorption sites

Cited by 169 publications

References 37 publications

Adsorption of Cesium, Cobalt, and Lead onto a Synthetic Nano Manganese Oxide: Behavior and Mechanism

Adsorption of Cesium, Cobalt, and Lead onto a Synthetic Nano Manganese Oxide: Behavior and Mechanism

Crystal growth and aggregation in suspensions of δ-MnO2nanoparticles: implications for surface reactivity

In situ arsenic oxidation and sorption by a Fe-Mn binary oxide waste in soil

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Crystal growth and aggregation in suspensions of δ-MnO₂nanoparticles: implications for surface reactivity