Pyroaurite-like phases (Mg-Fe3+ LDH) synthesis and solubility Article Swipe

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Ellina Bernard , Barbara Lothenbach , Rupert J. Myers , Marcus Yio ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.1016/j.cemconres.2024.107739

This study explores different methods for precipitating carbonated Mg-Fe³⁺ layered double hydroxides (LDHs) with Mg/Fe³⁺ ratios ranging from 2 to 2.5. Two synthesis approaches were investigated: a) CO₃-Mg-Fe³⁺-LDH co-precipitated directly from MgO, Fe(NO₃)₃ and Na₂CO₃ and b) NO₃-Mg-Fe³⁺-LDH precipitated by adding NaOH to Mg(NO₃)₂-Fe(NO₃)₃ solutions, followed by ion exchange with Na₂CO₃ to form CO₃-Mg-Fe³⁺-LDH. The solids were characterised using TGA, XRD and FTIR. For the co-precipitated samples in the presence of Na₂CO₃, the formation of carbonate-LDH was accompanied by ~10–30 wt% of hydromagnesite, while CO₃-Mg-Fe³⁺-LDH modified from the NO₃-Mg-Fe³⁺-LDH did not show any other Mg‑carbonates but contained Fe hydroxides, as evidenced by their brown coloration. All samples were re-equilibrated at 7, 20 and 50 °C. The solubility product (log Kso) was calculated from solution analysis, and preliminary thermodynamic data are presented. The findings provide insights into the stability and formation conditions of carbonated Mg-Fe³⁺ LDH phases in carbonate-rich environments.

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Solubility Materials science Chemical engineering Chemistry Physical chemistry Engineering

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Type: article
Language: en
Landing Page: https://doi.org/10.1016/j.cemconres.2024.107739
OA Status: hybrid
Cited By: 8
References: 58
Related Works: 10
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DOI: https://doi.org/10.1016/j.cemconres.2024.107739

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Title: Pyroaurite-like phases (Mg-Fe3+ LDH) synthesis and solubility

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Language: en

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Publication year: 2024

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Publication date: 2024-12-05

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Authors: Ellina Bernard, Barbara Lothenbach, Rupert J. Myers, Marcus Yio

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Landing page: https://doi.org/10.1016/j.cemconres.2024.107739

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Concepts: Solubility, Materials science, Chemical engineering, Chemistry, Physical chemistry, Engineering

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Cited by: 8

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