Bren School of Environmental Science and Management, University of California at Santa Barbara, CA, United States of America.
Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Tsinghua Shenzhen International Graduate School, Shenzhen, PR China.
PLoS One. 2020 Sep 30;15(9):e0239137. doi: 10.1371/journal.pone.0239137. eCollection 2020.
Sediment and soil contamination with toxic heavy metals, including cadmium (Cd2+) and lead (Pb2+), represents a major long-term remediation challenge. Resuspension of contaminated sediments into the water column, or the uptake of toxic metals from top soil, can lead to exposure of aquatic or terrestrial organisms, followed by bioconcentration, bioaccumulation and biomagnification, which may pose a threat to public health. We have developed a novel nanoscale engineered material, namely ligand-coated dense nanoparticles (Ligand DNPs), which contain a dense WO3 nanoparticle core and a shell functionalized with a metal-binding organic ligand (EDTA), to effectively sequester heavy metal ions deeper into the soil and sediments. We demonstrate that one application of Ligand DNPs can remove from 60% to almost 80% of the Cd and Pb in two different soil matrices, driving these metal ions deeper into the sediment or soil column via gravity, and making them less bioavailable. Ligand DNPs can provide a relatively fast, convenient, and efficient in-situ approach for the remediation of sediments and soils contaminated with heavy metals.
受污染沉积物和土壤中的有毒重金属（包括镉（Cd2+）和铅（Pb2+））是一个长期修复的重大挑战。受污染沉积物重新悬浮到水柱中，或从表土中摄取有毒金属，可能会导致水生或陆地生物暴露，随后发生生物浓缩、生物积累和生物放大，这可能对公共健康构成威胁。我们开发了一种新型纳米工程材料，即配体包覆的致密纳米颗粒（Ligand DNPs），它含有致密的 WO3 纳米颗粒核心和用金属结合有机配体（EDTA）官能化的壳，可有效将重金属离子固定在土壤和沉积物中更深的位置。我们证明，在两种不同的土壤基质中，Ligand DNPs 的一次应用可以去除 60%至近 80%的 Cd 和 Pb，通过重力将这些金属离子驱赶到沉积物或土壤柱中更深的位置，从而降低它们的生物利用度。Ligand DNPs 可为受重金属污染的沉积物和土壤的修复提供一种相对快速、方便和高效的原位方法。
