同时通过磁性生物炭从土壤浸物中去除Pb/Zn炼场所的Pb/As
Xiyun Yang1, Dandan Deng1, Zheng Liu2
1School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China.
Journal of environmental management
|June 26, 2024
概括
磁性生物炭有效地从受污染的土壤水中去除和. 本研究提出了一种优化的磁性生物炭制备方法,并证明了其在消除炼场多金属污染方面的高效率.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 土壤科学 土壤科学
背景情况:
- (Pb) 和 (As) 在炼活动中的污染对环境构成重大风险.
- 磁性生物炭 (MB) 是一个有前途的材料,用于修复多金属污染的土壤和液.
- 需要经济可行的MB制备方法,以有效地修复复杂的炼场所.
研究的目的:
- 使用优化的共同沉方法,制备一种改性磁性生物炭 (MB).
- 评估MB的应用潜力,用于同时从土壤浸物中去除Pb/As.
- 调查土壤浸物质对MB整治效率的影响.
主要方法:
- 优化了用于磁性生物炭制备的共同沉方法.
- 描述MB表面特性,包括氧化铁封装和功能组.
- 吸附实验以评估在不同条件下 (pH,竞争离子,DOM) 的Pb (II) 和As (III) 去除效率.
- 动力和同热模拟 (伪二次和兰格穆尔模型).
主要成果:
- MB的表面修改增强了氧化铁封装和含氧功能组.
- Pb (II) 和As (III) 的吸附遵循伪二阶动力学和兰格穆尔等热量.
- 漂水中的SO4^2-和Ca^2+在吸附点上竞争.
- 在pH5-9范围内,MB实现了>95%的As(III) 去除,在pH更高的情况下,Pb(II) 去除增加.
- 溶解有机物 (DOM) 增强了Pb (II) 和As (III) 的吸附.
- 在2g/L的应用率下,Pb (II) 和As (III) 降低到<0.05 mg/L.
结论:
- 准备好的MB显示了同时从土壤浸出物中去除Pb (II) 和As (III) 的巨大潜力.
- MB为Pb/Zn炼场的多金属污染土壤整治提供了一种有效和潜在的经济解决方案.
- MB的性能受到液化学的影响,但在相关条件下仍然非常有效.
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