Dissolution, Solubility, and Stability of the Basic Ferric Sulfate-Arsenates [Fe(SO4)x(AsO4)y(OH)z·nH2O] at 25–45°C and pH 2–10
Dissolution, Solubility, and Stability of the Basic Ferric Sulfate-Arsenates [Fe(SO4)x(AsO4)y(OH)z·nH2O] at 25–45°C and pH 2–10
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碱式硫酸铁砷酸盐 [Fe(SO4)x(AsO4)y(OH)z·nH2O] 在 25–45°C 和 pH 2–10 下的溶解度、溶解度和稳定性
DOI：
10.1155/2021/5556295
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发表时间：
2021-06
影响因子：
3
通讯作者：
Xingxing Wang
中科院分区：
文献类型：
--
作者：
Zongqiang Zhu;Hongqu Yang;Jie Liu;Yinian Zhu;Shen Tang;Lihao Zhang;Xingxing Wang
制备了碱式硫酸铁-砷酸盐[FeSAsOH，Fe（SO 4）x（AsO 4）y（OH）z·nH 2 O]，并对其进行了表征，通过330 d的溶解实验，研究了它们在氧化性和酸性环境中对砷的固定作用。合成固体是形状良好的单斜棱柱晶体。对于样品FeSAsOH-1 [Fe（SO 4）0.27（AsO 4）0.73（OH）0.27·0.26H2O]在25-45°C和初始pH 2下的溶解，所有组分在1-3 h内优先以AsO 43 − SO 42 − Fe 3+的顺序溶解，在1-3 h至12-24 h内优先以SO 42 − AsO 43 − Fe 3+的顺序溶解，最后是SO 42 − Fe 3 + AsO 43 −。释放的铁、硫酸盐和砷酸盐分别以Fe 3 +/Fe（OH）2+/FeSO 4+、HSO 4-/SO 42-/FeSO 4+和H3 AsO 40/H2 AsO 4-的形式存在。较高的初始pH值（6和10）可明显抑制Fe 3+从固体向溶液的释放，固体组分的释放顺序为SO 42 − AsO 43 − Fe 3+。首先溶解晶体顶部，并逐渐使晶体表面平滑/变圆，直到所有棱角消失。解离受到FeO 6八面体中Fe-O（H）断裂的限制，并受到OH−和AsO 4四面体异常值的阻碍;溶解砷的最低浓度为0.045 mg/L。在25°C、pH = 2的条件下进行了溶解实验，得到了碱式硫酸-砷酸铁[Fe（SO_4）_0.27（AsO_4）_0.73（OH）_0.27·0.26H_2O]的溶度积（Ksp）与平衡时的离子活度积（log Δ IAP）相等，计算结果为-23.04 ± 0.01，生成吉布斯自由能（ΔGfo）为−914.06 ± 0.03 kJ/mol。
Basic ferric sulfate-arsenates [FeSAsOH, Fe(SO4)x(AsO4)y(OH)z·nH2O] were prepared and characterized to study their potential fixation of arsenic in the oxidizing and acidic environment through a dissolution for 330d. The synthetic solids were well-shaped monoclinic prismatic crystals. For the dissolution of the sample FeSAsOH–1 [Fe(SO4)0.27(AsO4)0.73 (OH)0.27·0.26H2O] at 25–45°C and initial pH 2, all constituents preferred to be dissolved in the order of AsO43− SO42− Fe3+ in 1–3 h, in the order of SO42− AsO43− Fe3+ from 1–3 h to 12–24 h, and finally in the order of SO42− Fe3+ AsO43−. The released iron, sulfate, and arsenate existed dominantly as Fe3+/Fe(OH)2+/FeSO4+, HSO4−/SO42−/FeSO4+, and H3AsO40/H2AsO4−, respectively. The higher initial pHs (6 and 10) could obviously inhibit the release of Fe3+ from solid into solution, and the solid components were released in the order of SO42− AsO43− Fe3+. The crystal tops were first dissolved, and the crystal surfaces were gradually smoothed/rounded until all edges and corners disappeared. The dissociations were restricted by the Fe-O(H) breakdown in the FeO6 octahedra and obstructed by the OH− and AsO4 tetrahedra outliers; the lowest concentration of the dissolved arsenic was 0.045 mg/L. Based on the dissolution experiment at 25°C and pH 2, the solubility products (Ksp) for the basic ferric sulfate-arsenate [Fe(SO4)0.27(AsO4)0.73 (OH)0.27·0.26H2O], which are equal to the ion activity products (logˍIAP) at equilibrium, were calculated to be -23.04 ± 0.01 with the resulting Gibbs free energies of formation (ΔGfo) of −914.06 ± 0.03 kJ/mol.
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DOI：
10.1007/978-94-011-1214-7_10
发表时间：
1994
期刊：
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影响因子：
--
作者：
Pm Swash-;A. Monhemius
通讯作者：
Pm Swash-;A. Monhemius
DOI：
10.1007/s11144-016-1065-y
发表时间：
2016-08
期刊：
Reaction Kinetics, Mechanisms and Catalysis
影响因子：
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作者：
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通讯作者：
F. Patiño;Mizraim U. Flores;I. Reyes;S. Ordóñez;J. Eliecer Méndez;Víctor H. Flores;Hernán Islas;Martín Reyes
DOI：
10.5860/choice.33-6312
发表时间：
1970
期刊：
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影响因子：
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作者：
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通讯作者：
W. Stumm;J. J. Morgan-J.
DOI：
10.1017/cbo9781139207249.009
发表时间：
2012
期刊：
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影响因子：
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作者：
W. Marsden
通讯作者：
W. Marsden
影响因子：
2.5
作者：
Gomez, M. A.;Assaaoudi, H.;Demopoulos, G. P.
通讯作者：
Demopoulos, G. P.