基于生物活性碳酸的核心外结构材料的应用,用于在酸性条件下污染水中的重金属管理
Sheng Wang1, Shiming Xu2, Huiying Zhang3
1School of the Environment and Safety Engineering, School of Emergency Management, Jiangsu University, Zhenjiang, 212013, China; Wuzhen Laboratory, Yangtze Delta Region Research Institute of Tsinghua University, Jiaxing, 314500, China.
Journal of environmental management
|November 5, 2025
概括
一种新的生物碳酸材料在酸性条件下有效地固定 (Cd),防止二次污染. 这种微生物诱导碳酸盐沉 (MICP) 技术为重金属整治提供了一个可持续的解决方案.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 生物技术是生物技术.
背景情况:
- 固定碳酸 (CdCO3) 在酸性环境 (pH <5.6) 中不稳定,有可能造成二次污染.
- 微生物诱导碳酸盐沉 (MICP) 为稳定的重金属固定提供了一个潜在的解决方案.
研究的目的:
- 开发一种新的,稳定的生物碳酸 (bio-CaCO3) 材料用于 (Cd) 固定.
- 使用MICP技术在酸性条件下增强Cd2+的捕获和稳定性.
- 评估大规模应用开发材料的经济和社会可行性.
主要方法:
- 使用MICP和尿酶活性合成生物-CaCO3-Cd和生物-CaCO3-CdCO3复合物.
- 在3.55.6.6的pH范围内评估Cd2+固定效率.
- 尿素活性分析和Cd2+耐受性测试.
- 使用X射线衍射 (XRD),扫描电子显微镜 (SEM) 和能量分散光谱 (EDS) 的表征.
主要成果:
- 生物CaCO3-CdCO3材料在pH值3.5到5.6之间实现了56.2%96.3%的Cd2+固定.
- 生物CaCO3-0.1M显示出23倍高的尿酶活性,并保持了Cd2+ (10100 mg/L) ~90%的去除效率.
- 重矿化使表面Cd2+含量从9.75%降低到0.05%,证实了稳定的固定.
- 成本效益分析显示了重要的经济和社会效益,支持大规模应用.
结论:
- 新的生物-CaCO3核心外结构有效地固定了Cd2+并且在酸性环境中保持稳定.
- MICP技术和尿酶活动是创建可持续和高效的重金属整治战略的关键.
- 开发的材料为减轻重金属污染和二次污染提供了一种绿色,具有成本效益和可行的解决方案.
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