Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Hydroxyl, Fe2+, and Acidithiobacillus ferrooxidans Jointly Determined the Crystal Growth and Morphology of Schwertmannite in a Sulfate-Rich Acidic Environment
ACS Omega ( IF 3.7 ) Pub Date : 2021-01-22 , DOI: 10.1021/acsomega.0c05606 Kun Feng 1 , Xiaomeng Wang 1 , Bo Zhou 1 , Min Xu 1 , Jianru Liang 1 , Lixiang Zhou 1
ACS Omega ( IF 3.7 ) Pub Date : 2021-01-22 , DOI: 10.1021/acsomega.0c05606 Kun Feng 1 , Xiaomeng Wang 1 , Bo Zhou 1 , Min Xu 1 , Jianru Liang 1 , Lixiang Zhou 1
Affiliation
|
Schwertmannite, ubiquitously found in iron and sulfate-rich acid mine drainage, is generated via biological oxidation of ferrous ions by Acidithiobacillus ferrooxidans (A. ferrooxidans). However, little information on the mechanisms of biogenic schwertmannite formation and crystal growth is available. This study deliberately investigated the relationships among mineral morphology, solution chemistry, and phase transformation of schwertmannite in A. ferrooxidans-containing ferrous sulfate solutions. The formation of schwertmannite could be divided into three stages. In the first nucleation stage, crystallites are presented as nonaggregative or aggregative forms via a successive polymerization process. In the second stage, ellipsoidal aggregates, which are identified as ferrihydrite and/or schwertmannite, are formed. In the third stage, needles appear on the surface of ellipsoidal aggregates, which is caused by the phase transformation of ferrihydrite or schwertmannite to lepidocrocite and goethite through a Fe2+ (aq) catalysis-driven pathway. After three stages, a typical characteristic “hedgehog” morphology finally appears. In addition, A. ferrooxidans could significantly speed up the mineral transformation. Solution pH affects the morphology of schwertmannite by acid leaching. The experimental results also reveal that the formation of schwertmannite depend on the content of hydroxyl complexes or the transformation of the monomers to polymers, which are greatly affected by the solution pH.
中文翻译：
羟基、Fe2+和酸性氧化亚铁硫杆菌联合测定富含硫酸盐的酸性环境中施威特曼石的晶体生长和形态
施威特曼石普遍存在于富含铁和硫酸盐的酸性矿山排水中，是通过氧化亚铁硫杆菌 (A. 氧化亚铁)对亚铁离子进行生物氧化而生成的。然而，关于生物源施威特曼石形成和晶体生长机制的信息很少。本研究有意研究了含氧化亚铁的硫酸亚铁溶液中施威特曼石的矿物形态、溶液化学和相变之间的关系。施威特曼石的形成可分为三个阶段。在第一个成核阶段，微晶通过连续的聚合过程呈现为非聚集或聚集形式。在第二阶段，形成椭圆体聚集体，其被鉴定为水铁矿和/或施威特曼石。第三阶段，椭圆体聚集体表面出现针状结构，这是由于水铁矿或施威特曼石通过Fe 2+ (aq)催化驱动途径相变为纤铁矿和针铁矿而引起的。经过三个阶段，最终出现了典型特征的“刺猬”形态。此外，氧化亚铁菌可以显着加速矿物转化。溶液 pH 值通过酸浸影响施威特曼石的形态。实验结果还表明，施威特曼石的形成取决于羟基配合物的含量或单体向聚合物的转化，而这很大程度上受溶液pH值的影响。
更新日期：2021-02-02
中文翻译：
羟基、Fe2+和酸性氧化亚铁硫杆菌联合测定富含硫酸盐的酸性环境中施威特曼石的晶体生长和形态
施威特曼石普遍存在于富含铁和硫酸盐的酸性矿山排水中，是通过氧化亚铁硫杆菌 (A. 氧化亚铁)对亚铁离子进行生物氧化而生成的。然而，关于生物源施威特曼石形成和晶体生长机制的信息很少。本研究有意研究了含氧化亚铁的硫酸亚铁溶液中施威特曼石的矿物形态、溶液化学和相变之间的关系。施威特曼石的形成可分为三个阶段。在第一个成核阶段，微晶通过连续的聚合过程呈现为非聚集或聚集形式。在第二阶段，形成椭圆体聚集体，其被鉴定为水铁矿和/或施威特曼石。第三阶段，椭圆体聚集体表面出现针状结构，这是由于水铁矿或施威特曼石通过Fe 2+ (aq)催化驱动途径相变为纤铁矿和针铁矿而引起的。经过三个阶段，最终出现了典型特征的“刺猬”形态。此外，氧化亚铁菌可以显着加速矿物转化。溶液 pH 值通过酸浸影响施威特曼石的形态。实验结果还表明，施威特曼石的形成取决于羟基配合物的含量或单体向聚合物的转化，而这很大程度上受溶液pH值的影响。
京公网安备 11010802027423号