Two-Dimensional Modeling of Nano Zero-Valent Iron Transport and Retention before and after Phosphate Adsorption,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Two-Dimensional Modeling of Nano Zero-Valent Iron Transport and Retention before and after Phosphate Adsorption
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-11-28 , DOI: 10.1021/acs.est.2c05974
Dantong Lin ₁ , Liming Hu ₁ , Irene M C Lo ₂

Affiliation

The mobility of nano zero-valent iron (nZVI) will greatly affect its practical application as a remediation material for contaminated groundwater. One-dimensional (1D) column tests are commonly used in previous work to study its migration behavior, but the two-dimensional (2D) test is still very limited. This study reports a novel research system to study the 2D transport and retention behavior of colloids and solutes, which includes a 2D model test setup and the corresponding image analysis method. The transport behaviors of methyl orange (MO), nZVI, and phosphate-loaded nZVI (PnZVI) are studied using this system. The results show that the research system can reasonably describe the tempo-spatial concentration distribution of colloids and solutes. After phosphate adsorption, the mobility of nZVI is enhanced due to the increase in negative surface charge, which implies a potential environmental risk of nZVI to facilitate contaminant transport. The migration of PnZVI is not significantly influenced by its density, which is faster than MO in the longitudinal direction. The range of the plume of PnZVI in the longitudinal direction is larger than that of MO, which implies that PnZVI has a stronger longitudinal dispersion than MO.

中文翻译：

磷酸盐吸附前后纳米零价铁传输和保留的二维模型

纳米零价铁（nZVI）的流动性将极大地影响其作为污染地下水修复材料的实际应用。一维 (1D) 柱测试在以前的工作中常用于研究其迁移行为，但二维 (2D) 测试仍然非常有限。本研究报告了一种研究胶体和溶质二维传输和保留行为的新型研究系统，其中包括二维模型测试装置和相应的图像分析方法。使用该系统研究了甲基橙 (MO)、nZVI 和负载磷酸盐的 nZVI (PnZVI) 的传输行为。结果表明，该研究体系能够合理描述胶体和溶质的时空浓度分布。磷酸盐吸附后，由于负表面电荷的增加，nZVI 的流动性增强，这意味着 nZVI 促进污染物传输的潜在环境风险。PnZVI的迁移不受其密度的显着影响，其在纵向上比MO更快。PnZVI 的羽流在纵向的范围比 MO 大，这意味着 PnZVI 的纵向弥散比 MO 强。

更新日期：2022-11-28

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11