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Table 2 Elemental compositions of the synthetic “c-disordered” H+-birnessites after exchanged with Mg2+ for 24 h

From: Formation of todorokite from “c-disordered” H+-birnessites: the roles of average manganese oxidation state and interlayer cations

Sample Na (mmol/g) K (mmol/g) Mg (mmol/g) Mn (mmol/g) K/Mn Mg/Mn C/Mn*
0.42-Na-H-Bus 0.01 0.05 1.86 9.55 0.005 0.195 0.396
0.52-Na-H-Bus 0.02 0.04 2.34 8.56 0.005 0.273 0.554
0.67-Na-H-Bus 0.01 0.04 2.43 7.64 0.005 0.318 0.643
0.52-K-H-Bus 0 0.26 1.82 7.78 0.033 0.234 0.501
0.52-H-Bus 0.02 0.11 1.00 9.13 0.012 0.110 0.233
  1. * Equivalent charge of metal ions per Mn.