Fig. 3
From: Effect of Mn2+ concentration on the growth of δ-MnO2 crystals under acidic conditions
The XRD patterns of solid samples in adsorption kinetics experiments of 25 mM Mn2+ on δ-MnO2 in solutions with pH 2.5 (a) and 4 (b)
Fig. 3 | Geochemical Transactions