Studies on the formation of todorokite-type manganese oxide with different crystalline birnessites by Mg2+-templating reaction

Liu, Zong–Huai; Kang, Liping; Ooi, Kenta; Makita, Yoji; Feng, Qi

doi:10.1016/j.jcis.2004.11.021

Cited by 23 publications

(16 citation statements)

References 27 publications

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“…Table 2 presents the mineral formulas of the synthesized samples based on the chemical data obtained in this study. (Red-BIR) had the highest Na content, which can be related to its high crystallinity as reported by Liu et al [70]. The Mg content of todorokite was almost similar to those of the (Oxi-TOD) and (Red-TOD) samples.…”

Section: Chemical Analysissupporting

confidence: 74%

“…The different physicochemical properties of birnessite are highly related to the specific surface area and average oxidation number, both of which vary based on the synthesis conditions [63]. The various methods used to synthesize single-phase high-purity manganese oxide have been studied to understand the natural formation process, crystal structure, and chemical composition of todorokite and its suitability for various applications [49][50][51][64][65][66][67][68][69][70][71][72][73].…”

Section: Introductionmentioning

confidence: 99%

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Physicochemical Characteristics of the Birnessite and Todorokite Synthesized Using Various Methods

Min

Kim

2020

Minerals

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The synthesis methods used to produce todorokite (10 Å manganate, OMS-1) and birnessite (7 Å manganate), which are abundant in marine manganese nodules, have been studied to confirm whether pure mineral phases can be obtained and to compare their physicochemical characteristics. The physicochemical characteristics of todorokite and its precursor Na–birnessite can vary widely based on the precursors used during their synthesis. Birnessite can be synthesized via three mechanisms, i.e., the oxidation of Mn2+, a redox reaction between Mn2+ and MnO4−, or the reduction of MnO4−. Herein, four precursors are used to synthesize birnessite using different methods before being transformed into todorokite. The characteristics of the birnessite and todorokite synthesized using different methods are investigated via X-ray diffraction (XRD), chemical analysis, Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and field emission scanning electron microscopy (SEM). Based on the method used, birnessite and todorokite exhibit distinct physicochemical features, including crystallinity, crystal structure, specific surface area, oxidation state of manganese, thermal stability, and morphology. Thus, the characteristics of birnessite and todorokite are closely correlated, indicating the importance of designing suitable methods to synthesize them for specific applications.

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Section: Chemical Analysissupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Physicochemical Characteristics of the Birnessite and Todorokite Synthesized Using Various Methods

Min

Kim

2020

Minerals

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“…Another thermally stable version of todorokite can be synthesized by a similar hydrothermal treatment via oxidation of Mn(OH) 2 with Mg(MnO 4 ) 2 to prepare precursor birnessite in alkali media (Shen et al, 1993). Other hydrothermal methods for todorokite syntheses that use different birnessite preparation procedures or microwave heating have also been reported (Feng et al, 1995(Feng et al, , 1998Vileno et al, 1998;Ching et al, 1999;Luo et al, 1999;Liu et al, 2005). In addition to hydrothermal methods, a mild reflux procedure under atmospheric pressure was proposed to synthesize todorokite in our previous work (Feng et al, 2004).…”

Section: Comparison Of the Transformation Of Chemically Synthesized Bmentioning

confidence: 99%

“…strain SG-1 forms poorly ordered Mn oxide tunnel structures, similar to todorokite (Webb et al, 2006); however, this phase has not been identified in environmental systems. Synthetic todorokites are generally obtained from modifying a layer structured Mn oxide with triclinic symmetry via a hydrothermal chemical route at relatively high temperature and pressure (Golden et al, 1986;Shen et al, 1993;Feng et al, 1995Feng et al, , 1998Vileno et al, 1998;Ching et al, 1999;Luo et al, 1999;Liu et al, 2005). The formation of todorokite is greatly accelerated under mild reflux conditions at atmospheric pressure, enabling the simulation of formation processes for naturally occurring todorokite (Feng et al, 2004;Cui et al, 2006Cui et al, , 2008Cui et al, , 2009a.…”

Section: Introductionmentioning

confidence: 99%

Formation of nano-crystalline todorokite from biogenic Mn oxides

Feng

Zhu

Ginder‐Vogel

et al. 2010

Geochimica et Cosmochimica Acta

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“…As smectites, phyllomanganates can be intercalated with a variety of organic and inorganic compounds to form multilayer nanocomposites [11][12][13][14][15][16][17], or pillared structures [18][19][20][21][22][23][24]. In addition, phyllomanganates have been widely used as templates for the formation of octahedral molecular sieves with variable tunnel sizes that have demonstrated excellent potential in heterogeneous catalysis, hazardous waste remediation, and rechargeable battery technology [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. More recently, mesoporous hollow shells with birnessite walls have also been synthesized [43].…”

Section: Introductionmentioning

confidence: 99%

Structure of the synthetic K-rich phyllomanganate birnessite obtained by high-temperature decomposition of KMnO4

Gaillot

Drits

Manceau

et al. 2007

Microporous and Mesoporous Materials

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The structure of a synthetic potassium-rich birnessite prepared from the thermal decomposition of KMnO 4 at 1000°C in air has been refined by Rietveld analysis of the powder X-ray diffraction (XRD) data, and the structure model shown to be consistent with extended X-ray absorption fine structure data. K-rich birnessite structure is a two-layer orthorhombic polytype (2O) with unit-cell parameters a = 5.1554(3) Å, b = 2.8460(1) Å, c = 14.088(1) Å, α = β = γ = 90°, a/b = √3.281, and was refined in the Ccmm space group. The structure is characterized by the regular alternation of octahedral layers rotated with respect to each other by 180°. Octahedral layers are essentially devoid of vacant sites, the presence of 0.25 Mn 3+ layer cations within these layers being the main source of their deficit of charge, which is compensated for by interlayer K + cations. Mn 3+ octahedra, which are distorted by the Jahn-Teller effect, are systematically elongated along the a axis (cooperative Jahn-Teller effect) to minimize steric strains, thus yielding an orthogonal layer symmetry. In addition, Mn 3+ octahedra are segregated in Mn 3+-rich rows parallel to the b axis that alternate with two Mn 4+ rows according to the sequence …-Mn 3+-Mn 4+-Mn 4+-Mn 3+-… along the a direction, thus leading to a A = 3a super-periodicity. At 350°C, the structure partially collapses due to the departure of interlayer H 2 O molecules and undergoes a reversible 2O-to-2H phase transition. This transition results from the relaxation of the cooperative Jahn-Teller effect, that is from the random orientation of elongated Mn 3+ octahedra.

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Studies on the formation of todorokite-type manganese oxide with different crystalline birnessites by Mg2+-templating reaction

Cited by 23 publications

References 27 publications

Physicochemical Characteristics of the Birnessite and Todorokite Synthesized Using Various Methods

Physicochemical Characteristics of the Birnessite and Todorokite Synthesized Using Various Methods

Formation of nano-crystalline todorokite from biogenic Mn oxides

Structure of the synthetic K-rich phyllomanganate birnessite obtained by high-temperature decomposition of KMnO4

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