（二，三价）阳离子分配和嵌入剂阴离子型对水滑石溶解度的影响,Journal of the American Ceramic Society

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（二，三价）阳离子分配和嵌入剂阴离子型对水滑石溶解度的影响
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-06-22 , DOI: 10.1111/jace.17324
Dale P. Prentice _{1,

2} , Lauren Gomez‐Zamorano ₃ , Magdalena Balonis ₄ , Bartu Erdemli ₁ , Kirk Ellison ₅ , Narayanan Neithalath ₆ , Dante Simonetti ₇ , Gaurav Sant _{1,

2,

4,

8}

Affiliation

合成水滑石是通过共沉淀法生产的。水滑石由通式[M ^II_（1-x） M ^III_（x）（OH）₂ ] [A ^n- ] _{x / n} ·zH ₂ O表示，其中M ^II是二价阳离子（例如，Mg ^{2 +}或Ca 2 ⁺），M ^III是三价阳离子（例如Al ³⁺），A ^n-是层间阴离子。本文中，M ^II =镁，并且M ^III =铝，使得[镁/铝] = [2,3]（原子单元）和A^正，表示插层的物种，包括：OH ^-，SO ₄^2-和CO ₃^2-阴离子。在T = 25±0.5°C和P = 1 bar下，对每种化合物的热化学数据（包括其溶解度常数（K _so），密度和摩尔体积）进行定量。的合成的水滑石中的溶解度，而不论其二价三价阳离子分割比，缩放为CO ₃^2- <SO ₄^2- <OH ^-; 以降低溶解度的顺序。阴离子的类型对溶解度的影响很小，当[Mg / Al] = 2时，其变化小于±1 log单位；对于[Mg / Al] = 3时，其变化小于±2 log单位。这些相的溶解度与三水铝石（Al（OH）₃）密切相关; 的，使得活性的AlO ₂^- ]物种是溶解度确定随pH增加。表中的热力学数据用于构建涵盖两种阳离子分布比的固相固溶模型，并用于计算与碱活化矿渣（AAS）系统有关的各种活化剂组成的稳定相平衡。

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The effects of (di‐,tri‐valent)‐cation partitioning and intercalant anion‐type on the solubility of hydrotalcites

Synthetic hydrotalcites were produced by a co‐precipitation method. The hydrotalcites are represented by the general formula [M^II_(1‐x)M^III_(x)(OH)₂][Aⁿ⁻]_x/n·zH₂O, where M^II is a divalent cation (eg, Mg²⁺or Ca²⁺), M^III is a trivalent cation (eg, Al³⁺) and Aⁿ⁻ is the interlayer anion. Herein, M^II = Mg, and M^III = 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 (K_so), 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.

更新日期：2020-08-10

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