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首页> 外文期刊>Journal of Chemistry >Dissolution, Solubility, and Stability of the Basic Ferric Sulfate-Arsenates [Fe(SO 4 ) x (AsO 4 ) y (OH) z ·nH 2 O] at 25–45°C and pH 2–10
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Dissolution, Solubility, and Stability of the Basic Ferric Sulfate-Arsenates [Fe(SO 4 ) x (AsO 4 ) y (OH) z ·nH 2 O] at 25–45°C and pH 2–10

机译：碱性硫酸盐 - 砷酸酯的溶解，溶解性和稳定性 - 在25-45℃和pH 2-10处在25-45℃和pH 2-10时（SO 4）x（ASO 4）Y（OH）y（OH）Z·NH 2 O]

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Basic ferric sulfate-arsenates [FeSAsOH, Fe(SO 4 ) x (AsO 4 ) y (OH) z ·nH 2 O] 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(SO 4 ) 0.27 (AsO 4 ) 0.73 (OH) 0.27 ·0.26H 2 O] at 25–45°C and initial pH 2, all constituents preferred to be dissolved in the order of AsO 4 3? ??SO 4 2? ??Fe 3+ in 1–3?h, in the order of SO 4 2? ??AsO 4 3? ??Fe 3+ from 1–3?h to 12–24?h, and finally in the order of SO 4 2? ??Fe 3+ ??AsO 4 3? . The released iron, sulfate, and arsenate existed dominantly as Fe 3+ /Fe(OH) 2+ /FeSO 4 + , HSO 4 ? /SO 4 2? /FeSO 4 + , and H 3 AsO 4 0 /H 2 AsO 4 ? , respectively. The higher initial pHs (6 and 10) could obviously inhibit the release of Fe 3+ from solid into solution, and the solid components were released in the order of SO 4 2? ??AsO 4 3? ??Fe 3+ . 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 FeO 6 octahedra and obstructed by the OH ? and AsO 4 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 ( K sp ) for the basic ferric sulfate-arsenate [Fe(SO 4 ) 0.27 (AsO 4 ) 0.73 (OH) 0.27 ·0.26H 2 O], which are equal to the ion activity products (log?IAP) at equilibrium, were calculated to be -23.04?±?0.01 with the resulting Gibbs free energies of formation (Δ G f o ) of ?914.06?±?0.03?kJ/mol.
机译：基本硫酸铁-砷酸盐[FeSAsOH，铁（SO 4）×（ASO 4）Y（OH）2·nH的2 O]的制备和表征通过为330D的溶解来研究它们在氧化和酸性环境砷的电势固定。合成固体井字形单斜棱形晶体。对于样品FeSAsOH-1的溶解的[Fe（SO 4）0.27（ASO 4）0.73（OH）0.27·0.26H 2 O]在25-45℃，初始pH 2，优选所有成分溶解在订购ASO 4 3的？ ？＆？所以4 2？ ？＆在的SO 4 2的顺序的Fe 3+在1-3小时，？？？？ ？＆GT; ASO 4 3？ ？＆有？的Fe 3+从1-3小时到12-24小时，最后在SO 4 2的顺序？ ？＆GT;铁3+＆有ASO 4 3？ 。所释放的铁，硫酸根，和砷酸盐存在显性的Fe 3+ / Fe的（OH）2+ /的FeSO 4 +，HSO 4？ / SO 4 2？ /的FeSO 4 +和H 3 ASO 4 0 / H 2 ASO 4？ ， 分别。较高的初始pH值（6和10）能明显抑制的Fe 3+的释放从固体进入溶液，和固体组分在SO 4 2的顺序释放？ ？＆GT; ASO 4 3？ ？＆GT;铁3+。晶体顶部首先溶解，并且在晶体表面逐渐平滑/圆形，直到所有棱角消失。的离解，通过在中FeO 6八面体FeO的（H）击穿限制，并且由阻碍OH？和ASO 4四面体的异常值;溶解的砷的最低浓度为0.045？毫克/升。基于在25℃下的溶解实验和pH 2，溶度积（K SP）为基本硫酸铁-砷酸的[Fe（SO 4）0.27（ASO 4）0.73（OH）0.27·0.26H 2 O]，其是等于离子活度产品（日志？IAP）在平衡状态下，分别计算为-23.04？±？0.01，与形成的？914.06？±？0.03？千焦/摩尔所得到的吉布斯自由能（ΔģFO） 。

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