铁细菌培养过程中低分子有机酸钠盐对含硫酸根铁矿物形成的影响
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P579

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国家自然科学基金项目(41472034);江苏省自然科学基金项目(BK20191444)


Effects of low molecular organic sodium salts on the formation of sulfate-containing iron minerals during the cultivation of Acidithiobacillus ferrooxidans
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    摘要:

    普遍存在环境中的低分子有机酸盐对氧化亚铁硫杆菌的矿化产物(施氏矿和黄钾铁矾等铁矿物)会产生影响,从而导致环境中有毒重金属迁移转化发生变化。本文探讨了低分子有机酸钠盐对铁细菌HX3成长过程中代谢产物铁矿物的影响,并利用XRD、FTIR、FESEM和EDS对形成的铁矿物进行了表征与分析。研究结果表明,低浓度低分子有机酸钠盐的加入对细菌氧化Fe2+的影响不明显,但可加速黄钾铁矾的形成;苹果酸钠的加入较柠檬酸钠和草酸钠更利于施氏矿向黄钾铁矾转变。高浓度低分子有机酸钠盐(苹果酸钠、柠檬酸钠和草酸钠依次为20、40和40 mmol/L)的加入对细菌培养过程中Fe2+的氧化有抑制作用;抑制影响从大到小的顺序为:苹果酸钠>柠檬酸钠>草酸钠。该研究结果可为含氧化亚铁硫杆菌等铁细菌的酸性矿山废水中铁矿物的形成转化和生物矿化机理提供理论参考。

    Abstract:

    The low molecular organic sodium commonly existed in the environment can affect the biomineralized products (schwertmannite and jarosite) of Acidithiobacillus ferrooxidans (A. ferrooxidans), which can lead to changes in the migration and transformation of toxic heavy metals in the environment. This paper discussed the influence of low molecular organic sodium salts on the bacterially metabolized iron minerals during the growth process of A. ferrooxidans HX3, and also characterized and analyzed the iron minerals by XRD, FTIR, FESEM and EDS. The study results showed that the addition of low molecular organic sodium salts at the lower concentrations had unobvious effects on the Fe2+ oxidation, but it could accelerate the formation of jarosite. Addition of sodium malate was conducive to the transformation of schwertmannite to jarosite, compared with addition of sodium citrate or sodium oxalate. Addition of the low molecular organic sodium salts at the higher concentration (i.e. 20, 40 and 40 mmol/L for sodium malate, sodium citrate and sodium oxalate, respectively) inhibited the oxidation of Fe2+ during bacterial cultivation process. The sequence of inhibitory effects from large to small was following: sodium malate>sodium citrate>sodium oxalate. These results could provide a theoretical reference for the formation and transformation of iron minerals in acid mine wastewater containing iron bacteria such as A. ferrooxidans, and their biomineralization mechanism.

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花敏,张笛,姜艾伶,熊慧欣,2021,铁细菌培养过程中低分子有机酸钠盐对含硫酸根铁矿物形成的影响[J].岩石矿物学杂志,40(4):786~794.

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  • 收稿日期:2021-01-08
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  • 在线发布日期: 2021-07-16
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