Zero valent iron and goethite nanoparticles as new promising remediation techniques for As-polluted soils

Baragaño, Diego; Alonso, J.; Gallego, J.R.; Lobo, M.C.; Gil-Díaz, M.

doi:10.1016/j.chemosphere.2019.124624

Cited by 89 publications

(37 citation statements)

References 50 publications

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“…The zeta potential of nZVI was −32.6 mV due to the polyacrylic acid (PAA) coating 36 . In contrast, nGOx are not covered, so the zeta potential value, −13 mV, corresponded to the functional groups of the material.…”

Section: Resultsmentioning

confidence: 99%

“…To test the effectiveness of nanoparticles to immobilize metal(oid) s, subsamples of 15 g of polluted soil were treated in vials with nZVI and nGOx at a range of doses. For nZVI, the doses chosen were based on previous experiments using this material (0.2%, 1% and 5% w/w) to treat other As-polluted soils 11,15,36,40,65,66 . The same doses were used for nGOx in order to facilitate the comparison of results.…”

Section: Batch Experiments and Monitoringmentioning

confidence: 99%

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Nanoremediation of As and metals polluted soils by means of graphene oxide nanoparticles

Baragaño

Forján

Welte

et al. 2020

Sci Rep

105

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the capacity of graphene oxide nanoparticles (nGox) to reduce or increase As and metals availability in polluted soils was compared with that of zero valent iron nanoparticles (nZVi). the nanomaterials used in this study were characterized by X-ray techniques, cHnS-o analysis, dynamic light scattering, and microscopy procedures such as atomic force microscopy. to assess the capacity of these materials to immobilize pollutants, field samples of two soils were treated with nZVI and nGOx at a range of doses (0.2%, 1% and 5%). Availability tests were then performed. nGOx effectively immobilized Cu, Pb and cd, but mobilized As and p (even at low doses), in the latter case irrespective of the simultaneous presence of high concentrations of metals. in turn, nZVi promoted notable immobilization results for As and pb, a poorer result for cd, and an increased availability for cu. Soil pH and ec have been slightly affected by nGOx. On the whole, nGOx emerges as a promising option for mobilization/immobilization strategies for soil nanoremediation when combined with other techniques such as phytoremediation. Industrial activities have released large amounts of metals (Cu, Cd, Pb, Zn, etc.) and metalloids (especially As) into the environment and caused serious damage to the ecosystem 1. In addition, metals and metalloids can endanger human health, as many of them are toxic even at very low concentrations, and even carcinogenic (e.g. As) and mutagenic 2. Unlike organic pollutants that can degrade into harmless small molecules, the abovementioned inorganic pollutants are recalcitrant to many biochemical reactions and thus particularly difficult to remove from soils 3. Regarding As, several studies have confirmed that between 52,000 and 112,000 tons of this metalloid are released into the environment every year 1,4,5. Many diseases, such as lung cancer, skin cancer, bladder cancer, etc., can be caused by contact with As 6,7. Given that As is highly toxic for humans, and also for plants and animals, it has been classified as a priority hazardous pollutant. Unlike the aforementioned metals, As is an anionic contaminant. In this regard, simultaneous remediation of soils affected by anionic and cationic contaminants is a challenge 8 ; i.e., As remediation is even more complex in contexts of concurrent pollution with metals. In fact, classical remediation approaches attempt, among other objectives, to raise the pH of soils contaminated with cationic metals and thus stabilize them. However, this approach causes As to be solubilized 9. Overall, the various remediation strategies available focus on the disjuncture between immobilization and mobilization of the pollutants 10. Soil nanoremediation by means of Fe-nanoparticles (nZVI) simultaneously reduces the availability of As and metals in polluted soils, as shown in recent pilot-scale in situ trials 11 , and by means of hybrid soil-washing techniques 12. nZVI have a Fe° core surrounded by an oxide/hydroxide shell, which grows thicker as iron oxidation progresses. In addition, nZVI pres...

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Section: Resultsmentioning

confidence: 99%

Section: Batch Experiments and Monitoringmentioning

confidence: 99%

Nanoremediation of As and metals polluted soils by means of graphene oxide nanoparticles

Baragaño

Forján

Welte

et al. 2020

Sci Rep

105

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“…This is probably due to the lower capacity of nZVI to remove Ni in presence of Cu, thus implying higher Ni availability in soils. Previous experiments also detected a decrease in soil phytotoxicity after the reduction of As, Hg and Pb bioavailability by nZVI treatment 14,22,26 . www.nature.com/scientificreports/…”

Section: Impact Of Nzvi On Fe Availabilitymentioning

confidence: 72%

“…The nanoparticle suspension was stabilized with polyacrylic acid, a biodegradable organic surfactant, to avoid the agglomeration phenomena, keeping iron nanoparticles well accessible to reactions. The Fe(0) content was 14-18%, and 2-6% was iron oxides, the average size was close to 60 nm, the active surface area was 20 m 2 /g and the zeta potential was 32 mV 13,22 . Two doses of nZVI (1% and 5%, w:w or 1.8 and 9 g Fe/kg) were selected based on previous studies 15,20,22 and taking into account that the doses were environmentally and economically viable.…”

Section: Methodsmentioning

confidence: 99%

“…www.nature.com/scientificreports/ However, this increase depends on soil buffering capacity. Thus, in alkaline soils, with high buffering capacity, the addition of nZVI moderately increased the pH 15,22,29,34 . The electrical conductivity significantly decreased in the soils polluted with Ni and Cu + Ni after treatment with nZVI and this effect was dose-dependent, probably due to the reduction of metal availability.…”

Section: Impact Of Nzvi On Fe Availabilitymentioning

confidence: 96%

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Effectiveness of nanoscale zero-valent iron for the immobilization of Cu and/or Ni in water and soil samples

Gil-Díaz¹,

Álvarez²,

Alonso³

et al. 2020

Sci Rep

Self Cite

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In the last few years, the effectiveness of nanoscale zero-valent iron (nZVI) as a treatment for polluted waters and soils has been widely studied. However, little data are available on its efficacy for metal immobilization at low and moderate doses. In this study, the effectiveness of two doses of commercial nZVI (1 and 5%) to immobilize Cu and/or Ni in water and acidic soil samples was evaluated. The influence of the nanoremediation technology on iron availability, physico-chemical soil properties and soil phytotoxicity was also assessed. The results show that the effectiveness of nZVI to immobilize Cu and Ni in water and soil samples was determined by the dose of the nanomaterial and the presence of both metals. Nickel immobilization was significantly decreased by the presence of Cu but the opposite effect was not observed. nZVI showed better immobilization capacity in water than in soil samples. In water, the dose of 5% completely removed both metals, whereas at a lower dose (1%) the percentage of immobilized metal decreased, especially for Ni in Cu + Ni samples. In soil samples, 5% nZVI was more effective in immobilizing Ni than Cu, with a 54% and 21% reduction of leachability, respectively, in single contaminated samples. In Cu + Ni soil samples, nZVI treatment led to a significant decrease in Ni immobilization, similar to that observed in water samples. The application of nZVI induced a dose-dependent increase in available Fe—a relevant effect in the context of soil rehabilitation. Germination assays of Medicago sativa and Vicia sativa seeds revealed that treatment with nZVI did not induce phytotoxicity under the experimental conditions tested, and that the phytotoxicity induced by Ni decreased significantly after the treatment. Thus, the use of nZVI emerges as an interesting option for Cu and/or Ni immobilization in water samples. The effectiveness of nZVI to remove Cu from acidic soil samples was moderate, while for Ni it was strongly dependent on the presence of Cu. These observations therefore indicate that the results in water samples cannot be extrapolated to soil samples.

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Combined Use of Remediation Technologies with Electrokinetics

Gomes

Bustos

2021

Electrokinetic Remediation for Environmental Security and Sustainability

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Zero valent iron and goethite nanoparticles as new promising remediation techniques for As-polluted soils

Cited by 89 publications

References 50 publications

Nanoremediation of As and metals polluted soils by means of graphene oxide nanoparticles

Nanoremediation of As and metals polluted soils by means of graphene oxide nanoparticles

Effectiveness of nanoscale zero-valent iron for the immobilization of Cu and/or Ni in water and soil samples

Combined Use of Remediation Technologies with Electrokinetics

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