| Professional Committee of Rock and Mineral Testing Technology of the Geological Society of China, National Geological Experiment and Testing Center | Host |
| Citation: |
Jun-dong HU, Wei LIU, Ya-ting SHEN, Guo-hui LU Guo-hui. Review on the Co-behavior of Nanoparticles and Heavy Metals in the Presence of Natural Organic Matter in the Natural Environment[J]. Rock and Mineral Analysis, 2013, 32(5): 669-680.
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Review on the Co-behavior of Nanoparticles and Heavy Metals in the Presence of Natural Organic Matter in the Natural Environment
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Abstract
Due to the wide presence of nanoparticles (NPs) and heavy metals (HMs) in the environment, especially in porous media like soil, their fate and transport behaviors and hence the environmental impacts will greatly depend on their speciation, the impacts of natural organic matter (NOM) and how they interact with each other. Most correlative studies select typical NPs, HMs and NOM as the model subjects and conduct a series of adsorption-desorption batch experiments and NPs-HMs co-transport experiments in porous media to systematically study the NPs-HMs co-behaviors. Both thermodynamic and kinetics models have been applied to describe the interfacial reaction and transport/retention data obtained from experiments. The parameters were well compared, simulated and interpreted in order to achieve a complete picture of the effects of NOM on the fate of NPs-HMs. To reveal the mechanisms of NPs surface adsorption and the metal ions immobilization by NPs between soil grains, a big series of characterization analysis methods can be employed, such as Transmission Electron Microscopy (TEM), X-ray Diffractomer (XRD), X-ray Photoelectron Spectrometer (XPS), Fourier Transform Infrared Spectrometry (FTIR) and X-ray Absorption Near Edge Structure Spectrometry/Extended X-ray Absorption Fine Structure Spectrometry(XANES/EXAFS). Some of these methods working together are believed as a very effective and efficient approach in modern study. Understanding how the NPs impact on the leachability and bioavailability of heavy metals in subsurface porous media is of fundamental importance to the accurate assessment of environmental and ecological impacts of NPs. The results also have great significance to well comprehend the mechanisms of nano soil remediation.-
Keywords:
- nanoparticles /
- heavy metals /
- natural organic matter /
- adsorption /
- transport /
- co-behaviors /
- soil
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References
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Jun-dong HU, Wei LIU, Ya-ting SHEN, Guo-hui LU Guo-hui. Review on the Co-behavior of Nanoparticles and Heavy Metals in the Presence of Natural Organic Matter in the Natural Environment[J]. Rock and Mineral Analysis, 2013, 32(5): 669-680.
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- Figure 1. (A) A TEM micrograph of zerovalent iron nanoparticles[8],(B) a SEM image of zerovalent iron with 250 nm scale bar [8],(C) a TEM image of magnetite nanoparticles with 100 nm scale bar [9],and (D) a TEM micrograph of iron oxide nanoparticles[10]
- Figure 2. Schematic representation of the interaction and the potential environmental effects of engineered nanoparticles with natural environmental components: self-aggregation/disaggregation,transport and the co-behaviors with NOM or other contaminant [13]
- Figure 3. AFM images of humic acid aggregates in a real humic acid suspension with a concentration of 2 μg/g (5 mmol/L NaCl，pH=6.7). The upper image is AFM Deflection error mode,the lower image is AFM Friction mode [18]
- Figure 4. TEM images of (a) pure maghemite nanoparticles，(b) Cu-adsorbed maghemite nanoparticles at pH＝6.5，and (c) Ni-adsorbed maghemite nanoparticles at pH＝8.5[25]
- Figure 5. Conceptual model for Cr immobilization with zero-valent iron nanoparticle [8]
- Figure 6. 6 FTIR spectra for iron oxide nanoparticles: (a) before and (b) after treating with As(Ⅲ) traces in water [10]
- Figure 7. (a) Least squares fitting of sodium selenide (Na2Se) and elemental Se (Se0) model compound spectra to synthetic iron selenide (FeSe),and (b) fitting of Na2Se and synthetic FeSe to Se(Ⅵ)-treated nano Fe0 data[29]
- Figure 8. (a) Schematic diagrams of saturated flow system,(b) unsaturated flow system [35]
- Figure 9. (a) The AFM phase image of HA-coated γFe2O3NPs on a mica surface shows that humic acid (HA) molecules coated a single NP as well as nanoclusters (the aggregates of 2-3 nanoparticles) produced by strong magnetic attraction[37],(b) Schematic illustration of the proposed aggregation mechanism of Al2O3-NP in the presence of humic acid (HA) at pH=4[38]