University of Novi Sad, Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, Trg Dositeja Obradovica 3, 21000, Novi Sad, Serbia.
University of Novi Sad, Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, Trg Dositeja Obradovica 3, 21000, Novi Sad, Serbia.
Chemosphere. 2021 Jan;263:127816. doi: 10.1016/j.chemosphere.2020.127816. Epub 2020 Aug 6.
This study investigates the performance of oak (OL) and mulberry (ML) leaves for synthesized of nanoscale zero-valent iron (nZVI), in immobilizing Cu and Ni in contaminated sediment. Characterization of synthesized Fe nanoparticles from oak and mulberry leaf extracts demonstrated that they are nontoxic and stabile nanomaterials for application in the sediment remediation. Effectiveness of stabilization process was performed by microwave-assisted sequential extraction procedure (MWSE) and single-step leaching tests which have been applied to evaluate the metal extraction potential. This research showed that OL-nZVI and ML-nZVI were effective in transforming available Cu and Ni to stable fraction. The maximum residual percentage of Cu increased by 76% and 73%, and for Ni 81% and 80%, respectively, with addition of 5% OL-nZVI and 5% ML-nZVI. Used single-step leaching tests (Toxicity Characteristic Leaching Procedure-TCLP and German standard test- DIN) indicated that all stabilized samples can be considered as non-hazardous waste, as all leached metal concentrations met the appropriate set criteria. Cost analysis showed that the operating cost for contaminated sediment treatment with green synthesized nZVI are 50.37 €/m3/per year. This work provides a new insight into the immobilization mechanism and environmental impact of Cu and Ni in contaminated sediment and potential way of treatment with OL-nZVI and ML-nZVI. Generally, nZVI can be an effective and versatile tool for stabilization of sediment polluted with toxic metals.
本研究探讨了橡树叶（OL）和桑树叶（ML）在合成纳米零价铁（nZVI）固定污染沉积物中铜（Cu）和镍（Ni）方面的性能。从橡树叶和桑树叶提取物中合成的 Fe 纳米粒子的特性表明，它们是无毒且稳定的纳米材料，可应用于沉积物修复。通过微波辅助顺序提取程序（MWSE）和单步浸出试验来评估稳定化过程的有效性，这两种方法都被应用于评估金属浸出潜力。研究表明，OL-nZVI 和 ML-nZVI 能有效地将可利用的 Cu 和 Ni 转化为稳定态。添加 5% OL-nZVI 和 5% ML-nZVI 后，Cu 的最大残留比例分别增加了 76%和 73%，Ni 则增加了 81%和 80%。单步浸出试验（TCLP 和德国标准试验 DIN）表明，所有稳定化的样品都可被视为非危险废物，因为所有浸出金属浓度都符合相应的设定标准。成本分析表明，用绿色合成的 nZVI 处理污染沉积物的操作成本为 50.37 欧元/立方米/年。本研究为污染沉积物中 Cu 和 Ni 的固定化机制和环境影响提供了新的见解，以及使用 OL-nZVI 和 ML-nZVI 进行处理的潜在方法。总的来说，nZVI 可以成为一种有效且通用的工具，用于稳定污染有毒金属的沉积物。
