Interactions of iron-based nanoparticles with soil dissolved organic matter: Adsorption, aging, and effects on hexavalent chromium removal
Interactions of iron-based nanoparticles with soil dissolved organic matter: Adsorption, aging, and effects on hexavalent chromium removal
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铁基纳米颗粒与土壤溶解有机物的相互作用：吸附、老化及其对六价铬去除的影响
DOI：
10.1016/j.jhazmat.2020.124650
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发表时间：
2020
影响因子：
13.6
通讯作者：
Hui Jiang
中科院分区：
文献类型：
--
作者：
Cai Hui;Yiping Zhang;Xin Ni;Qilu Cheng;Yunpeng Zhao;Yuhua Zhao;Linna Du;Hui Jiang
研究了土壤溶解性有机质（DOM）与三种铁基纳米颗粒（NPs）的相互作用及其机理，在短期暴露实验中研究了纳米级零价铁（nZVI）颗粒、Fe 2 O3 NPs和Fe 3 O 4 NPs。吸附结果表明，土壤DOM在铁基纳米粒子表面吸附迅速，吸附速率为Fe 3 O 4> Fe 2 O3> nZVI。光谱分析结果表明，高分子量的芳香族DOM组分被优先吸附。通过傅里叶变换红外光谱（FT-IR）分析，确定结合机理为氢键和配体交换。采用扫描电子显微镜、红外光谱、X射线光电子能谱和X射线衍射等方法对三种铁基纳米粒子在吸附平衡时的腐蚀产物进行了表征。结果表明，nZVI的主要腐蚀产物为Fe 3 O 4和/或γ-Fe 2 O3和α-FeOOH，α-FeOOH是Fe 3 O 4纳米颗粒的老化产物。Cr（VI）的去除实验结果表明，老化后的纳米零价铁对Cr（VI）的去除率达到79.87%，在纳米Fe 2 O3上包覆DOM后，Cr（VI）的去除率显著提高。总体数据表明铁基纳米颗粒的命运和转化以及DOM和纳米颗粒之间相互作用后对Cr（VI）去除的增强。
The interactions and mechanisms between soil dissolved organic matter (DOM) and three types of iron-based nanoparticles (NPs), i.e., nanoscale zero-valent iron (nZVI) particles, Fe2O3NPs, and Fe3O4NPs, were investigated in short-term exposure experiments. The adsorption results showed that soil DOM was rapidly adsorbed on the surface of the iron-based NPs with the adsorption rate varying according to Fe3O4> Fe2O3> nZVI. Spectral analysis results revealed that aromatic DOM fractions with high-molecular-weights were preferentially adsorbed. The binding mechanism was determined as hydrogen bonding and ligand exchange via Fourier transform infrared spectroscopy (FT-IR) analysis. Scanning electron microscopy, FT-IR, X-ray photoelectron spectroscopy, and X-ray diffraction were used to identify the corrosion products of the three iron-based NPs at the adsorption equilibrium. The results suggest that Fe3O4and/or γ-Fe2O3and α-FeOOH were the main corrosion products of nZVIs and α-FeOOH was obtained as an aged product of Fe3O4NPs. Results of Cr(VI) removal tests suggest that the aged nZVI achieved 79.87% of Cr(VI) removal and the Cr(VI) removal efficiency was significantly improved by coating DOM onto Fe2O3NPs. The overall data indicate the fate and transformation of iron-based NPs and the enhancement for Cr(VI) removal after interactions between DOM and NPs.