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揭示铁基纳米颗粒在和多孔介质中的迁移趋势

Veronika Veselská¹, Leonardo Magherini², Carlo Bianco²

¹Czech Advanced Technology and Research Institute, Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, Šlechtitelů 27, 783 71, Olomouc, Czech Republic.

Journal of environmental management

|October 8, 2024

概括

预测纳米级零价值铁 (nZVI) 运输对于环境修复至关重要. 表面电荷和修改显著影响nZVI的流动性,硫化和有机改性版本显示在含水层中分布的增强.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.

背景情况:

纳米级零价值铁 (nZVI) 颗粒对于环境修复至关重要.
了解多孔介质中的nZVI传输动态对于优化整治策略至关重要.
目前的知识差距阻碍了nZVI在各种环境中的有效应用.

研究的目的:

开发和验证一种用于预测和多孔环境中的nZVI传输的新方法.
将标准nZVI的移动性与其商业衍生品在类似现场条件下进行比较.
识别控制nZVI移动性的表面特性并优化粒子分布.

主要方法:

利用先进的长列装置进行实时监测,使用磁感应度测量.
使用修改后的MNMs 2023软件进行数值建模,以预测粒子移动性.
研究的标准nZVI和四种衍生品:化,PAA涂层,氧化被动化和硫化nZVI.

主要成果:

表面电荷被确定为影响nZVI移动性的主要因素,因为粒子大小,形态和表面积在各个变体中都是一致的.
最佳的运输发生在强烈的负面电荷下;磁吸引导致聚合和减少移动性.
建模预测可检测的nZVI度 (20 g L-1),距离注射井0.4至1.1米之间.
轻微硫化的nZVI表现出比前体更长的旅行距离和更均的分布.
有机改性nZVI旅行最远,但在注射点附近显示积累.

结论:

表面修饰,特别是与有机修饰相结合的最小硫化,可以显著提高nZVI在含水层中的分布.
优化的nZVI运输提高了商业可行性,减少了不利影响,并扩大了环境修复中的实际应用.
开发的预测方法为设计有效的基于nZVI的整治策略提供了宝贵的见解.

关键词:

环境整治环境整治表面和化学修饰的改变运输建模运输建模没有价值的铁.

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