School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China; Water Pollution Control Technology Key Lab of Hunan Province, Changsha 410083, China.
School of Metallurgy and Environment, Central South University, Changsha, 410083, China.
Mater Sci Eng C Mater Biol Appl. 2020 Jun;111:110755. doi: 10.1016/j.msec.2020.110755. Epub 2020 Feb 18.
Tooeleite is the only known ferric arsenite sulfate mineral and has environmental significance for arsenic remediation. This study investigated the formation and stability of biogenic tooeleite in Fe(II)-As(III)-SO environment using Acidithiobacillus ferrooxidans under the ambient conditions. The results show that bacteria facilitated the formation and crystallization of tooeleite owing to the microbial oxidation of Fe(II) to Fe(III). Due to the better growth of bacteria, the higher removal of As(III) by tooeleite formation was achieved under 8.978-10.806 g/L initial Fe(II) concentration and 2.00-3.00 initial pH, and the highest efficiency was ~95%. Fe(III) and As(III) precipitated simultaneously into two types of tooeleite. The relatively stable tooeleite is featured by the developed (020) crystal face and the bulk-like structure with thick flakes. This study yields a better understanding of biogenic tooeleite, and the importance of tooeleite formation in As(III)-rich environment for arsenic remediation.
太勒石是唯一已知的高铁砷酸铁硫酸盐矿物，对于砷的修复具有环境意义。本研究采用氧化亚铁硫杆菌在环境条件下，研究了 Fe(II)-As(III)-SO 环境中生物成因太勒石的形成和稳定性。结果表明，由于微生物将 Fe(II)氧化为 Fe(III)，细菌促进了太勒石的形成和结晶。由于细菌的生长更好，在初始 Fe(II)浓度为 8.978-10.806 g/L 和初始 pH 值为 2.00-3.00 的条件下，通过太勒石形成去除 As(III)的效果更高，最高效率约为 95%。Fe(III)和 As(III)同时沉淀成两种类型的太勒石。相对稳定的太勒石的特征是发达的（020）晶面和具有厚片状的块状结构。本研究更好地了解了生物成因的太勒石，以及太勒石在富含砷的环境中形成对砷修复的重要性。
