TY - JOUR
T1 - The effects of (di-,tri-valent)-cation partitioning and intercalant anion-type on the solubility of hydrotalcites
AU - Prentice, Dale P.
AU - Gomez-Zamorano, Lauren
AU - Balonis, Magdalena
AU - Erdemli, Bartu
AU - Ellison, Kirk
AU - Neithalath, Narayanan
AU - Simonetti, Dante
AU - Sant, Gaurav
N1 - Funding Information:
The authors acknowledge financial support for this research provided by: The UC‐Mexus Program of the University of California and CONACYT, Universidad Autónoma de Nuevo León (UANL), the Electric Power Research Institute (EPRI), US National Science Foundation (CMMI: 1066583, 1401533), Federal Highway Administration (DTFH61‐13‐H‐00011), and the US‐China Clean Energy Research Center on Water Energy Technologies (CERC‐WET). The contents of this paper reflect the views and opinions of the authors, who are responsible for the accuracy of data presented herein. This research was conducted in the: Laboratory for the Chemistry of Construction Materials (LC), the Electron‐Microscopy (EM) Core and the Molecular Instrumentation Center (MIC) at UCLA and CLAS Goldwater Environmental Laboratory at Arizona State University (ASU). The authors acknowledge the support that has made these laboratories and their operations possible. 2
Funding Information:
The authors acknowledge financial support for this research provided by: The UC-Mexus Program of the University of California and CONACYT, Universidad Aut?noma de Nuevo Le?n (UANL), the Electric Power Research Institute (EPRI), US National Science Foundation (CMMI: 1066583, 1401533), Federal Highway Administration (DTFH61-13-H-00011), and the US-China Clean Energy Research Center on Water Energy Technologies (CERC-WET). The contents of this paper reflect the views and opinions of the authors, who are responsible for the accuracy of data presented herein. This research was conducted in the: Laboratory for the Chemistry of Construction Materials (LC2), the Electron-Microscopy (EM) Core and the Molecular Instrumentation Center (MIC) at UCLA and CLAS Goldwater Environmental Laboratory at Arizona State University (ASU). The authors acknowledge the support that has made these laboratories and their operations possible.
Publisher Copyright:
© 2020 The American Ceramic Society
PY - 2020/9/1
Y1 - 2020/9/1
N2 - Synthetic hydrotalcites were produced by a co-precipitation method. The hydrotalcites are represented by the general formula [MII(1-x)MIII(x)(OH)2][An−]x/n·zH2O, where MII is a divalent cation (eg, Mg2+or Ca2+), MIII is a trivalent cation (eg, Al3+) and An− is the interlayer anion. Herein, MII = Mg, and MIII = Al such that [Mg/Al] = [2, 3] (atomic units) and An−, represents intercalant species including: OH−, SO42− and CO32− anions. The thermochemical data of each compound including their solubility constants (Kso), density and molar volume were quantified at T = 25 ± 0.5°C, and P = 1 bar. The solubilities of the synthetic hydrotalcites, irrespective of their divalent-trivalent cation partitioning ratio, scaled as CO32− < SO42− < OH−; in order of decreasing solubility. The type of anion, very slightly, affected the solubility with less than ±1 log unit of variation for [Mg/Al] = 2, and ±2 log units of variation for [Mg/Al] = 3. The solubilities of these phases were strongly correlated with that of gibbsite (Al(OH)3); such that activity of the [AlO2−] species was solubility determining with increasing pH. The tabulated thermodynamic data were used to construct solid-solution models for phases encompassing both cation distribution ratios and to calculate stable phase equilibria relevant to alkali-activated slag (AAS) systems for diverse activator compositions.
AB - Synthetic hydrotalcites were produced by a co-precipitation method. The hydrotalcites are represented by the general formula [MII(1-x)MIII(x)(OH)2][An−]x/n·zH2O, where MII is a divalent cation (eg, Mg2+or Ca2+), MIII is a trivalent cation (eg, Al3+) and An− is the interlayer anion. Herein, MII = Mg, and MIII = Al such that [Mg/Al] = [2, 3] (atomic units) and An−, represents intercalant species including: OH−, SO42− and CO32− anions. The thermochemical data of each compound including their solubility constants (Kso), density and molar volume were quantified at T = 25 ± 0.5°C, and P = 1 bar. The solubilities of the synthetic hydrotalcites, irrespective of their divalent-trivalent cation partitioning ratio, scaled as CO32− < SO42− < OH−; in order of decreasing solubility. The type of anion, very slightly, affected the solubility with less than ±1 log unit of variation for [Mg/Al] = 2, and ±2 log units of variation for [Mg/Al] = 3. The solubilities of these phases were strongly correlated with that of gibbsite (Al(OH)3); such that activity of the [AlO2−] species was solubility determining with increasing pH. The tabulated thermodynamic data were used to construct solid-solution models for phases encompassing both cation distribution ratios and to calculate stable phase equilibria relevant to alkali-activated slag (AAS) systems for diverse activator compositions.
KW - LDH
KW - hydrotalcite-like minerals
KW - solubility constant
KW - thermodynamics
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U2 - 10.1111/jace.17324
DO - 10.1111/jace.17324
M3 - Article
AN - SCOPUS:85087637318
SN - 0002-7820
VL - 103
SP - 6025
EP - 6039
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 10
ER -