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, Fe₂O₃ NPs, and Fe₃O₄ NPs, 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 Fe₃O₄ and/or γ-Fe₂O₃ and α-FeOOH were the main corrosion products of nZVIs and α-FeOOH was obtained as an aged product of Fe₃O₄ NPs. 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 Fe₂O₃ NPs. 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.

土壤溶解有机物（DOM）与三种类型的铁基纳米颗粒（nZVI），Fe ₂ O ₃ NP和Fe ₃ O ₄ NP之间的相互作用和机理为在短期暴露实验中进行了调查。吸附结果表明，土壤DOM迅速吸附在铁基NPs表面，吸附速率随Fe ₃ O ₄ > Fe ₂ O _3的变化而变化。> nZVI。光谱分析结果表明，高分子量芳族DOM组分被优先吸附。通过傅立叶变换红外光谱（FT-IR）分析确定结合机理为氢键和配体交换。扫描电子显微镜，FT-IR，X射线光电子能谱和X射线衍射被用来确定三种铁基NP在吸附平衡时的腐蚀产物。结果表明，铁₃ ö ₄和/或γ-的Fe ₂ ö ₃和α-的FeOOH是nZVIs和α-的FeOOH的主要腐蚀产物，得到的Fe的老化产物₃ ö ₄NP。Cr（VI）去除测试的结果表明，老化的nZVI达到了79.87％的Cr（VI）去除，并且通过将DOM涂覆到Fe ₂ O ₃ NP上，Cr（VI）去除效率得到了显着提高。总体数据表明，铁基NP的命运和转变以及DOM和NP之间相互作用后Cr（VI）去除的增强。