斯蒂布尼特 (Sb2S3) 氧化溶解的独特机制由产生酸和产生的微生物在广泛的pH范围内的介导
Liyuan Ma1, Jingkang Zhang2, Weikang Gao3
1School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; Hunan Provincial Key Laboratory of Geochemical Processes and Resource Environmental Effects, Changsha, Hunan 410114, China; School of Engineering, Cardiff University, Cardiff CF243AA, United Kingdom.
Journal of hazardous materials
|April 3, 2025
概括
在矿中的土著微生物通过不同的途径溶解了stibnite. 产生酸的细菌氧化硫化物,而产生的细菌使用pH值变化和EPS,影响的调动和氧化.
科学领域:
- 环境微生物学 环境微生物学
- 地质化学 地质化学
- 生物地质化学生物地质化学
背景情况:
- 在矿区的微生物影响着 (Sb2S3) 溶解.
- 微生物调解的具体机制仍然不太了解.
- 了解这些过程对于管理反污染至关重要.
研究的目的:
- 为了研究产生酸的 (Bosea sp. AS-1) 和产生的植物 (Pseudomonas sp. PS-3) 细菌与stibnite进行相互作用.
- 为了比较微生物对酸性和性条件下的stibnite溶解的影响.
- 阐明微生物新陈代谢,基因调节和细胞外产物在转化中的作用.
主要方法:
- 与Bosea sp.共同培养的stibnite与Bosea sp.进行共同培养. 在酸性 (pH5) 下的AS-1和Pseudomonas sp. 在性 (pH8) 条件下的PS-3.
- 监测总 (Sb) 的释放,Sb) 的III和Sb) 的V度.
- 通过PS-3对AS-1和细胞外聚合物质 (EPS) 生产的基因表达 (SoxB,SoxC) 的分析.
- 评估被动化层和硫氧化中间体的形成.
主要成果:
- 与无菌对照组相比,AS-1和PS-3都显著促进了岩溶解.
- AS-1通过SOxB/SoxC调节将硫化物氧化为硫酸盐来驱动溶解,释放高达18.63 mg/L的Sb (总) 并完全氧化Sb (III) 到Sb (V).
- 通过增加pH (>9.0) 和产生EPS,释放高达35.56 mg/L的Sb总量,PS-3促进溶解,但被被动化层和不完整的SbIII氧化 (<44%) 抑制.
结论:
- 微生物调解酸溶解的过程通过不同的机制,取决于细菌类型和环境pH值.
- 产生酸的细菌通过硫化物氧化增强抗的释放,而产生的细菌利用pH变化和EPS,尽管有局限性.
- 这些发现有助于我们更好地理解在采矿影响的环境中对的生态化学循环.
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