Interactions of iron-based nanoparticles with soil dissolved organic matter: adsorption, aging, and effects on hexavalent chromium removal
| Autor: | Yunpeng Zhao, Qilu Cheng, Yiping Zhang, Cai Hui, Hui Jiang, Yuhua Zhao, Lin-Na Du, Xin Ni |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
021110 strategic
defence & security studies Environmental Engineering Scanning electron microscope Health Toxicology and Mutagenesis 0211 other engineering and technologies Nanoparticle 02 engineering and technology 010501 environmental sciences 01 natural sciences Pollution Corrosion chemistry.chemical_compound Adsorption chemistry X-ray photoelectron spectroscopy Dissolved organic carbon Environmental Chemistry Hexavalent chromium Fourier transform infrared spectroscopy Waste Management and Disposal 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Journal of hazardous materials. 406 |
| ISSN: | 1873-3336 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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