School of Environment, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang, Henan, 453007, PR China.
Henan Key Laboratory of Green Chemistry, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, PR China.
Chemosphere. 2019 Jun;224:390-397. doi: 10.1016/j.chemosphere.2019.02.139. Epub 2019 Feb 26.
Rapid aggregation and deactivation of nanoscale zero-valent iron (nZVI) hinder its application in environmental remediation. In this work, micro-scale CaCO is used as a dispersive carrier of nZVI to create a novel composite, CaCO-supported nZVI (nZVI@CaCO), through simplified liquid-phase reduction strategy. The morphology analysis shows that CaCO exhibits a fagot-like structure, and Fe particles are well dispersed on CaCO with an average diameter of around 15 nm. The removal of Pb(II) from water by nZVI@CaCO is studied, and it is found that the removal capacity of lead is as high as 3828 mg/g, which is much greater than that by neat CaCO (2209 mg/g) and bare nZVI (1308 mg/g). Owing to the loading of Fe (50%) in nZVI@CaCO, a significant synergistic effect is observed between CaCO and nZVI in high performance removal of lead. Furthermore, a possible removal mechanism is proposed from a comparative investigation on the surface valence state and nZVI@CaCO phase before and after absorption of Pb(II). Considering the advantages of improved dispersibility, easy preparation and remarkable performance, the as-prepared nZVI@CaCO has the potential to become a promising remediation material for Pb(II) polluted water.
纳米零价铁（nZVI）的快速聚集和失活阻碍了其在环境修复中的应用。在这项工作中，微尺度 CaCO 被用作 nZVI 的分散载体，通过简化的液相还原策略，制备了一种新型的复合纳米材料，CaCO 负载的 nZVI（nZVI@CaCO）。形貌分析表明，CaCO 呈束状结构，Fe 颗粒均匀分散在 CaCO 上，平均粒径约为 15nm。研究了 nZVI@CaCO 对水中 Pb(II)的去除效果，发现其对 Pb(II)的去除容量高达 3828mg/g，远高于纯 CaCO（2209mg/g）和纯 nZVI（1308mg/g）。由于 nZVI@CaCO 中负载了 50%的 Fe，在高效去除 Pb(II)方面，CaCO 和 nZVI 之间表现出显著的协同效应。此外，通过对比研究 Pb(II)吸附前后的表面价态和 nZVI@CaCO 相，提出了一种可能的去除机制。考虑到改善分散性、易于制备和显著性能的优势，所制备的 nZVI@CaCO 有望成为一种有前途的 Pb(II)污染水修复材料。
