Because of its unique reductive properties, nanoscale zero-valent iron (NZVI) has been widely used in soil and groundwater remediation. It is crucial to understand the fate of NZVI in soils. In this work, a range of laboratory experiments was conducted to examine the adsorption, transformation, and transport of NZVI. The NZVI particles showed relatively strong sorption onto vertic shajiang-aquic cambosols, typic-hapli-udic argosols and typic ochri-aquic cambosols and isotherms can be well described by the Langmuir model. When cultivated in the soils, the NZVI was oxidized within seven days and the particle size also increased with average size reaching around 100 nm at 28 days. Columns were packed with quartz sand, sandy soil and diatomite as saturated porous media to evaluate the role of soil colloids in affecting the transport of NZVI. The results showed that NZVI transport in the columns was strongly affected by medium types, dispersion agent types, and soil colloids. Comparisons of breakthrough curves of different types of dispersed NZVI and corresponding colloid-NZVI revealed that natural soil colloids facilitated NZVI transport in porous media. Findings from this work can provide useful information to better evaluate the applications and impacts of NZVI as an environmental remediation agent.

由于其独特的还原特性，纳米级零价铁（NZVI）已被广泛用于土壤和地下水修复。了解NZVI在土壤中的命运至关重要。在这项工作中，进行了一系列实验室实验，以研究NZVI的吸附，转化和运输。NZVI颗粒在sha状鲨江水成因胶溶土，典型的ha普利地阿拉伯水溶溶胶和典型的ri状水成因胶乳上表现出相对较强的吸附能力，等温线可以用Langmuir模型很好地描述。当在土壤中耕种时，NZVI在7天之内被氧化，粒径也随之增加，平均粒径在28天达到100 nm左右。色谱柱填充有石英砂，沙质土壤和硅藻土作为饱和多孔介质，以评估土壤胶体在影响NZVI传输中的作用。结果表明，NZVI在色谱柱中的迁移受到介质类型，分散剂类型和土壤胶体的强烈影响。比较不同类型的NZVI和相应的胶体NZVI的穿透曲线，发现天然土壤胶体促进了NZVI在多孔介质中的运输。这项工作的发现可以提供有用的信息，以更好地评估NZVI作为环境修复剂的应用和影响。