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Birnessite NaCaKxMnMn2O415H2O t

Birnessite NaCaKxMnMn2O415H2O t

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Raman spectra (a) standard synthetic birnessite (MnO2); (b) precipitate

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X-ray diffraction patterns corresponding to birnessite-type oxides using glucose and polyvinyl alcohol

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Fig. 3

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3.1. Transformation of Ni sorbed hexagonal birnessite to todorokite

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The ratios of TM (TM = Co, Ni) in birnessite layer (TME) to TM adsorbed at vacancies (TMTC) with the increase of the contents of TM in the structures ...

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Zn2 +-saturated birnessites with different Mn AOSs

Figure 6.

V K-edge XANES (a) and k2-weighted EXAFS (b) and fourier transformed (FT) spectra (c) of reference compounds and V-doped birnessites. For the V-containing ...

Evolution of the net surface charge (a) and Na and K contents (b) of hexagonal birnessite with pH. This charge was calculated according to Eq. S1 in the ...

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Fig. 1. XRD patterns of the LMO sample heated at various temperatures for 20 min. B, birnessite; C, cryptomelane.

EDS spectra of (a) initial triclinic Na-birnessite, (b) birnessite in the pH 7 unbuffered solution, (c) birnessite in the pH 7 MES-buffered solution, ...

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Fig. 2

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Material stability (a) effect of pH (b) Birnessite speciation, and (

Ijerph 14 01145 g001 550

Oxidation of 0.5 mmol/L Cr(III) with addition to goethite prior to birnessite. Experimental conditions: 0.5 g/L birnessite, 0.01 mol/L NaCl of supporting ...

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XRD patterns of (a) Na-birnessite, (b) H-birnessite, (c) TMA-birnessite, and (d) TMA-birnessite (wet state).

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FTIR-spectra of birnessite synthesized a) for this experiment b) by McKenzie, 1971 and c) by Händel et al. (2013).

FTIR spectra of samples in the range of 2000–4000 cm−1: (a) birnessite; (b) CTMA-birnessite; (c) BA-adsorbed CTMA-birnessite; (d) Ca2+ exchanged ...

Fig. 4.

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Photoelectrochemical Properties of Birnessite-Type MnO2 Thin Films for Solar Water Splitting

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Adsorption desorption hysteresis of: (a) Na-birnessite, (c) Sr

The amount of Mn extracted into an acidified aqueous solution from neat birnessite before and after grinding for 5 min and from a DCP/birnessite mixture ...

The influence of crystallite size on electrochemistry of Mg-birnessite was studied for the first time. Material with smaller crystallite size showed ...

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Fig. 5

In situ XRD patterns for (a) biogenic birnessite, (b) H+-exchanged birnessite, (c) alkaline birnessite and (d) acidic birnessite after heating from 300 to ...

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Fig. 1

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Fig. 3

Fig. 1.

Fig. 2

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Activity diagrams of lithiophorite, birnessite, kaolinite, and gibbsite. Log[aAl3 +/(aH +)3] = 8.2; logfO2 = − 18.21. After Nahon and Parc, 1990.

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XRD patterns (a) and FT-IR spectra (b) of solid products from the oxidation of pyrite suspension by birnessite at pH 3.0.

TEM images of (a) birnessite and (b) Au/birnessite

Impacts of 3% birnessite addition on NH4+-N concentrations for subtropical and temperate soils during the 10 days incubation at 28 °C with soil moisture of ...

Fig. 5

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XRD patterns of iron (A) and manganese (B) spinels undoped and K-doped with different precursors (squares — Fe2O3, circles — potassium birnessite, ...

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FE-SEM, TEM and HR-TEM images of the as-synthesized birnessite-type manganese oxide nanobelts by the hydrothermally route using a KOH–Mn2+–MnO4− system ...

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Nanomaterials 07 00396 g014 550

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(a) Layered structure of sodium birnessite. The interlayer distance d=7.1 Å corresponds to two consecutive superimposed MnO6 octahedral sheets.

Idealized sheet composition of birnessite varieties with different unit cell symmetries, but equivalent negative structural charge.

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XPS spectra of Mn 2p for MnOOH nanorods and birnessite nanowires.

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Synthesis of ultrasmall Li–Mn spinel oxides exhibiting unusual ion exchange, electrochemical, and catalytic properties | Scientific Reports

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Fig. 2

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Birnessite-subtracted IR spectra of KBi-PCP mixtures ground for 30 (a) and 60 (b) min. All spectra were recorded at room temperature and humidity.

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Fig. 1.

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Fig. 5

XRD patterns of (a) the K-NS-MnO2, (b) Cu-NS-MnO2, and (c) JCPDS data for K0.5Mn2O4·1.6H2O (Birnessite, ...

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X-ray diffraction patterns of Green Bay FFN taken with 0.3 mm collimator, including

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