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首页> 外文期刊>Materials science & engineering >Biosynthesis Of Schwertmannite By Acidithiobacillus Ferrooxidans Cell Suspensions Under Different Ph Condition
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Biosynthesis Of Schwertmannite By Acidithiobacillus Ferrooxidans Cell Suspensions Under Different Ph Condition

机译：不同pH条件下酸性氧化硫硫杆菌细胞悬浮液对Schwartmannite的生物合成

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摘要

Oxidation of FeSO_4 solution with initial pH in the range of 1.40-3.51 by Acidithiobacillus ferrooxidans LX5 cell at 26 ℃ and subsequent precipitation of resulting Fe(III) were investigated in the present study. Results showed that the oxidation rate of Fe(II) was around 1.2-3.9 mmol l~(-1) h~(-1). X-ray diffraction (XRD) indicated that the formed precipitates were composed of natrojarosite with schwertmannite when the initial pH was 3.51, while only schwertmannite was produced when initial pH was in the range of 1.60-3.44 and no precipitate occurred when initial pH≤1.40. Scanning electron microscope (SEM) analyses showed that precipitates formed in solution with initial pH 3.51 were spherical particles of about 0.4 μm in diameter and had a smooth surface, whereas precipitates in solution with initial pH≤3.44 were spherical particles of approximately 1.0 μm in diameter, having specific sea-urchin morphology. Specific surface area of the precipitates varied from 3.42 to 23.45 m~2 g~(-1). X-ray fluorescence analyses revealed that schwertmannite formed in solution with initial pH in the range of 2.00-3.44 had similar elemental composition and could be expressed as Fe_8O_8(OH)_(4.42)(SO_4)_(1.79), whereas Fe_8O_8(OH)_(4.36)(SO_4)_(1.82) and Fe_8O_8(OH)_(4.29)(SO_4)_(1.86) as its chemical formula when the initial pH was 1.80 and 1.60, respectively.
机译：本研究研究了铁氧酸氧化硫杆菌LX5细胞在26℃氧化初始pH在1.40-3.51范围内的FeSO_4溶液，随后沉淀出Fe（III）。结果表明，Fe（II）的氧化速率约为1.2-3.9 mmol l〜（-1）h〜（-1）。 X射线衍射（XRD）表明，当初始pH为3.51时，所形成的沉淀物是由钠铁矾和schwertmannite组成，而当初始pH在1.60-3.44范围内时，仅生成schwertmannite，当初始pH≤1.40时没有沉淀发生。 。扫描电子显微镜（SEM）分析显示，初始pH值为3.51的溶液中形成的沉淀物为直径约0.4μm的球形颗粒，表面光滑，而初始pH≤3.44的溶液中的沉淀物为直径约1.0μm的球形颗粒。 ，具有特定的海胆形态。析出物的比表面积为3.42〜23.45m〜2g〜（-1）。 X射线荧光分析表明，在初始pH值为2.00-3.44的溶液中形成的Schwertmannite具有相似的元素组成，可以表示为Fe_8O_8（OH）_（4.42）（SO_4）_（1.79），而Fe_8O_8（OH）当初始pH分别为1.80和1.60时，其化学式为）_（4.36）（SO_4）_（1.82）和Fe_8O_8（OH）_（4.29）（SO_4）_（1.86）。

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