Sorption of Sr(II) Ions with Tricalcium Phosphate in the Presence of Humic Acids

IF 0.9 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Radiochemistry Pub Date : 2024-02-19 DOI:10.1134/S1066362223060073

A. A. Ioshin, I. V. Volkov, E. V. Polyakov

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Abstract

The sorption behavior of traces Sr(II) toward β-Ca₃(PO₄)₂ (TCP) depending on the concentration of the cation, pH, and concentrations of humic acids (HA) in the solution was studied. Thermodynamic analysis of the solubility of TCP (1) was performed taking into account the formation of Ca(OH)₂ (CH, 2), Ca(H₂PO₄)₂ (MCPA, 3), CaHPO₄·2H₂O (DCPD, 4), Ca₅(PO₄)₃OH (hydroxyapatite, OHAp, 5), and Ca₂P₂O₇ (DCPP, 6). It was shown that, depending on the pH of the solution, the main equilibrium phases with the solution are phases 4 and 5. X-ray diffraction analysis, Raman spectroscopy, and ³¹P NMR data of the phase (1) samples after contact with a solution of 0.01 M NaNO₃ for about 10 days showed the presence of only the phase 1. The solubility of 1 regarding the concentration of Ca²⁺, PO₄^3– ions and the stoichiometric ratio (Ca/P) in solutions, depending on pH, correspond to the presence of surface phases 4 or 5. The model of surface complexation in the Henry region adequately describes the mechanism of Sr(II) sorption by the surface phase 5 on TCP particles in the form of the SrHPO₄⁰ complex. The formation of the HA complex of Sr(II) in solution does not affect distribution coefficient K_d(Sr) in the range of HA concentrations of 0–150 mg/L due to the competitive effect of hydrogen phosphate ions on strontium complexes.

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腐殖酸存在时硒(II)离子与磷酸三钙的吸附作用

摘要研究了痕量 Sr(II) 对 β-Ca3(PO4)2 (TCP) 的吸附行为，该行为取决于阳离子的浓度、pH 值和溶液中腐植酸 (HA) 的浓度。考虑到 Ca(OH)2 （CH，2）、Ca(H2PO4)2（MCPA，3）、CaHPO4-2H2O（DCPD，4）、Ca5(PO4)3OH（羟基磷灰石，OHAp，5）和 Ca2P2O7（DCPP，6）的形成，对 TCP (1) 的溶解度进行了热力学分析。研究表明，根据溶液的 pH 值，与溶液的主要平衡相为相 4 和相 5。相（1）样品与 0.01 M NaNO3 溶液接触约 10 天后的 X 射线衍射分析、拉曼光谱和 31P NMR 数据显示，只存在相 1。根据溶液中 Ca2+、PO43- 离子的浓度和化学计量比 (Ca/P)，1 相的溶解度取决于 pH 值，与表面相 4 或 5 的存在相对应。亨利区域的表面络合模型充分描述了表面相 5 以 SrHPO40 复合物的形式吸附 TCP 颗粒上的 Sr（II）的机理。在 HA 浓度为 0-150 mg/L 的范围内，溶液中 Sr(II) 的 HA 复合物的形成不会影响分布系数 Kd(Sr)，这是因为磷酸氢离子对锶复合物有竞争作用。

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来源期刊

Radiochemistry CHEMISTRY, INORGANIC & NUCLEAR-

CiteScore

1.30

自引率

33.30%

发文量

期刊介绍： Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.