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Abstract
This study explores various methods for precipitating carbonated Mg-Fe3+ layered double hydroxides (LDHs) with different Mg/Fe3+ ratios (2–2.5). Two series were investigated: a) CO3-Mg-Fe3+-LDH were co-precipitated from MgO, Fe(NO3)3 and Na2CO3 and b) NO3-Mg-Fe3+-LDH precipitated from NaOH solutions added Mg(NO3)2-Fe(NO3)3 solution and later exchanged with Na2CO3 to form CO3-Mg-Fe3+-LDH. The solids were investigated by TGA, XRD and FTIR. In the co-precipitation samples in the presence of Na2CO3 in addition to carbonate-LDH also~10–30 wt% of hydromagnesite formed, while the CO3-Mg-Fe3+-LDH modified from the NO3-Mg-Fe3+-LDH did not show any other Mg‑carbonates. In addition, the samples contained Fe hydroxides, highlighted by brown color. The samples were re-equilibrated at 7, 20 and 50 °C. The solubility product (log Kso) was calculated from the solution analysis, and preliminary thermodynamic data are presented. These findings provide insights into the stability and formation conditions of carbonated Mg-Fe3+ LDH phases in carbonate-rich environments.
Published Version
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