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与Fe-Mn修饰生物炭相关的As和Cd在受污染的土壤上同时修复过程中的转化

Gai Zeng¹, Yang Ping², Hao Xu²

¹Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, People's Republic of China.

Environmental science and pollution research international

|July 12, 2024

概括

铁和修饰生物炭 (BC-Fe-Mn) 在受污染的土壤中有效稳定了 (As) 和 (Cd). 这项研究阐明了BC-Fe-Mnn背后的机制.

科学领域:

环境科学环境科学
土壤科学土壤科学
材料科学材料科学材料科学

背景情况:

土壤被 (As) 和 (Cd) 污染会造成严重的环境和健康风险.
传统的整治方法往往面临效率和成本效益的局限性.
基于生物炭的材料为现场土壤整治提供了一个有前途的途径.

研究的目的:

研究铁 (Fe) 和 (Mn) 改性生物炭 (BC-Fe-Mn) 在污染土壤中同时稳定As和Cd的有效性.
通过BC-Fe-Mn.阐明As和Cd的稳定机制.
为 BC-Fe-Mn 在土壤修复中大规模应用提供见解.

主要方法:

在受污染的土壤中应用BC-Fe-Mn.
对NaHCO3可提取的As和DTPA可提取的Cd的分析.
对As和Cd的规范分析.
金属部分和BC-Fe-Mn组件之间的相关性分析.
透析实验是为了分离反应的BC-Fe-Mn.
使用SEM-EDS,XRD和FTIR进行表面表征.

主要成果:

BC-Fe-Mn实现了60.8%的NaHCO3可提取的As和49.6%的DTPA可提取的Cd的去除.
稳定性归因于As和Cd的转化为低结晶度的Fe-bound,Fe-Mn氧化物结合和残留分数.
在As和Mn (OX分数) 和Cd与Fe和Mn (OX分数) 之间观察到正相关性.
在BC-Fe-Mn表面上发现了SEM-EDS和XRD (Fe0.67Mn0.33) OOH和Fe2O3.
FTIR显示α-FeOOH,R-COOFe/Mn+和O-H作为反应场所,MnAsO4被确定为稳定产品.

结论:

在受污染的土壤中,BC-Fe-Mn显示了同时稳定As和Cd的巨大潜力.
这项研究阐明了涉及表面复杂化和共同降水的复杂机制.
这些发现支持大规模使用BC-Fe-Mn进行有效的土壤整治.

关键词:

和联合污染造成的污染.一个透析实验实验.铁和改性生物炭是一种铁和改性生物炭.稳定机制的稳定机制

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