原位
涂层
含水层
纳米颗粒
化学工程
还原(数学)
可渗透反应墙
材料科学
化学
环境化学
环境科学
地质学
污染
纳米技术
地下水
岩土工程
环境修复
有机化学
工程类
生态学
几何学
数学
生物
作者
Zhenhai Liu,Qing Yang,Pengfei Zhu,Yaqi Liu,Xin Tong,Tianchi Cao,Mason B. Tomson,Pedro J. J. Alvarez,Tong Zhang,Wei Chen
标识
DOI:10.1021/acs.est.3c10637
摘要
Remediation of large and dilute plumes of groundwater contaminated by oxidized pollutants such as chromate is a common and difficult challenge. Herein, we show that in situ formation of FeS nanoparticles (using dissolved Fe(II), S(-II), and natural organic matter as a nucleating template) results in uniform coating of aquifer material to create a regenerable reactive zone that mitigates Cr(VI) migration. Flow-through columns packed with quartz sand are amended first with an Fe2+ solution and then with a HS- solution to form a nano-FeS coating on the sand, which does not hinder permeability. This nano-FeS coating effectively reduces and immobilizes Cr(VI), forming Fe(III)-Cr(III) coprecipitates with negligible detachment from the sand grains. Preconditioning the sand with humic or fulvic acid (used as model natural organic matter (NOM)) further enhances Cr(VI) sequestration, as NOM provides additional binding sites of Fe2+ and mediates both nucleation and growth of FeS nanoparticles, as verified with spectroscopic and microscopic evidence. Reactivity can be easily replenished by repeating the procedures used to form the reactive coating. These findings demonstrate that such enhancement of attenuation capacity can be an effective option to mitigate Cr(VI) plume migration and exposure, particularly when tackling contaminant rebound post source remediation.
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