Mechanisms of arsenite (As(III)) fixation regulated by jarosite biomineralization induced by Acidithiobacillus ferrooxidans
Shichao Yu , Yi Li , Baojun Yang , Jun Wang , Yang Liu , Rui Liao , Ke Zhang , Shitong Liu
Journal of Central South University ›› 2026, Vol. 33 ›› Issue (8) : 3527 -3544.
Jarosite, a common mineral in acid mine drainage (AMD), influences arsenic mobility, yet its role in arsenite (As(III)) transport remains unclear. This study investigated biogenic jarosite formation and intermediate-phase transformation in an Fe(II)-As(III)-SO42− environment using Acidithiobacillus ferrooxidans (Fe(II), 160 mmol/L; As(III), 10 − 200 mg/L). The results show that the bacteria first facilitated the crystallization of an As-rich schwertmannite precursor by oxidizing Fe(II) to Fe(III), and then drove its transformation into jarosite as pH declined. Combined analysis of XRD, FTIR, SEM, and elemental composition showed that Fe(III) and As(III) coprecipitated into biogenic jarosite with substituted arsenic. After 72 h, the highest arsenic fixed efficiency, about 60%, was achieved at initial pH 3.0. XPS results showed that As(III) was the main arsenic species on the surface of the intermediate schwertmannite phase. A threestage mechanism governed the process: microbial Fe(II) oxidation initiated As-rich schwertmannite formation, enabling rapid As(III) sequestration at pH>2.5; declining pH triggered jarosite nucleation on schwertmannite surfaces (transitional phase); and sustained acidity completed transformation to jarosite, partially remobilizing As(III) via schwertmannite dissolution. Regulation of pH and competing anions (e.g., phosphate, nitrate) is essential to optimize sequestration and stability during mineral transformation.
biogenic jarosite / coprecipitation / arsenite / acid mine drainage / migration
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Central South University
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