酸诱导的酸盐沉通过同时加速生物吸收和生物矿物化来增强 (Cd) 固定
Jiaru Yue1, Ting Li1, Jiang Tian1
1Department of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan, China; Hunan Provincial University Key Laboratory for Environmental and Ecological Health, Xiangtan University, Xiangtan, China.
Journal of hazardous materials
|April 16, 2024
概括
微生物诱导的酸盐沉 (MIPP) 通过Penicillium oxalicum显著增强了的固定. 添加酸增强了的生物吸收和生物矿物化,为受污染的地点提供了新的修复策略.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
- 土壤科学 土壤科学
背景情况:
- 土壤 (Cd) 固定对于环境修复至关重要.
- 微生物诱导酸盐沉 (MIPP) 是一种已知的固定重金属的机制.
- 在MIPP期间Cd生物吸收的作用需要进一步研究.
研究的目的:
- 调查MIPP期间Cd生物吸收的影响.
- 为了评估Penicillium oxalicum在固定Cd.的有效性.
- 为了确定酸 (HAP) 对P. oxalicum. oxalicum的Cd固定作用的协同作用.
主要方法:
- 隔离和识别了一种新的Penicillium oxalicum菌株.
- 培养实验评估Cd与HAP和没有HAP的固定.
- 使用离子交换和复合等技术分析Cd生物吸收,生物矿化和矿物形成.
主要成果:
- 单独的Penicillium oxalicum使5.4至12.6%的Cd2+固定不动.
- 在7天内,HAP的存在显著增强了P. oxalicum对Cd2+的固定,达到99%以上.
- 与单一种植相比,MIPP显著提高了Cd生物吸收 (71%) 和生物矿物化 (16%) 的效率,P.oxalicum在HAP的存在下实现了87.8%的Cd2+生物吸收效率.
- 通过离子交换和随后的矿化成各种Cd化合物 (例如Cd5(PO4) 3OH,CdS) 观察到Cd-apatite的形成.
结论:
- 在由P. oxalicum引起的MIPP期间,通过加速的生物吸收和生物矿物化显著增强Cd固定.
- 氧酸盐在提高Cd固定效率方面发挥着至关重要的作用.
- 这些发现揭示了MIPP中Cd固定化的新机制,并为金属污染现场的整治提供了洞察力.
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