Heavy metal release due to aging effect during zero valent iron nanoparticles remediation

Calderón, Blanca; Fullana, Andrés

doi:10.1016/j.watres.2015.06.004

Cited by 128 publications

(49 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This differential behavior between Pb and Zn immobilization was also detected for nGOx, as indicated above, and it also occurs with other organic soil amendments, such as compost and biochar, where Zn is the metal that has the least affinity in the sorption sites of the soil 54 . In the case of Cd, the results for nZVI addition were negligible, as the standard potential was lower (−0.44 V) but very close to that of Fe (−0.40 V), and thus the mechanism of immobilization is not expected to involve reduction 55 . The lack of sorption effect of nZVI may be attributed to their preferential adsorption of As and Pb before Cd.…”

Section: Discussionmentioning

confidence: 93%

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

Baragaño

Forján

Welte

et al. 2020

Sci Rep

110

View full text Add to dashboard Cite

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...

show abstract

Section: Discussionmentioning

confidence: 93%

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

Baragaño

Forján

Welte

et al. 2020

Sci Rep

110

View full text Add to dashboard Cite

show abstract

“…Calderon and Fullana () also examined the effect of nZVI aging on heavy metal release (Zn, Cd, Ni, Cu, and Cr). Results show that some of the metal ions (e.g., Cd and Ni) that had already been adsorbed by the nZVI were released to the solution in a long reaction period.…”

Section: Physicochemical Transformation Of Nzvi In Watermentioning

confidence: 99%

Aging of zero‐valent iron‐based nanoparticles in aqueous environment and the consequent effects on their reactivity and toxicity

Dong

Wang

et al. 2019

Water Environment Research

View full text Add to dashboard Cite

A fundamental understanding of the long-term fate of nanoscale zero-valent iron (nZVI)-based particles in aqueous environment and the corresponding impacts on their reactivity and toxicity is essential for the responsible use and management of the nanoparticles in environmental applications. This paper comprehensively reviews the physicochemical transformations of nZVI-based particles and the consequent effects on the particle's reactivity and toxicity. The corrosions of nZVI in water under both anaerobic and aerobic conditions are summarized. The transformation of contaminant-bearing nZVI is also discussed. Besides, the factors influencing the transformation of nZVI (i.e., pH, typical anions and cations, natural organic matter, surface stabilizers, bimetal decoration, and sulfidation treatment) are summarized and discussed. In addition, the effects of particle aging on its reactivity and toxicity are discussed. Generally, the aging of nZVI-based particles would have negative impact on the removal of contaminants, especially for the degradation of organic pollutants. However, the aging process of nZVI-based particles would cause a significant reduction in their toxicity. It is suggested that the nZVI-based particles would finally transform to less toxic or benign materials (i.e., iron (oxyhydr)oxides) over time. Finally, future perspectives are proposed to better quantify and predict the transformation of nZVI-based particles in aqueous environment. © 2019 Water Environment Federation • Practitioner points• The corrosion rates and products of nZVI in water varied much under anaerobic and aerobic conditions. • Typical anions and cations, natural organic matter, and iron types are critical factors influencing the physicochemical transformation of nZVI. • The aging of nZVI would have negative impact its reactivity, especially for the degradation of organic pollutants. • Although the fresh nZVI exhibits obvious toxicity, the aging process would cause a significant reduction in its toxicity.

show abstract

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Regarding the comparison between conventional nZVI and CE-nFe-P600, while at short reaction times nZVI eliminated the heavy metals from the aqueous solution with high yields (degradation > 99.9 % for Zn, Cd, Cu and Cr; and 93.4% for Ni), at extended periods the contaminants started to be released back to water. This behavior is ascribed to the oxidation of nZVI at long reaction times 9 . However, in the case of the encapsulated nanoparticles, the delivery of the heavy metal cations was not produced, as shown in Figure 3.…”

Section: A) B) Application Of Omw-ce-nfe In Heavy Metal Removalmentioning

confidence: 97%

Green Synthesis of Thin Shell Carbon-Encapsulated Iron Nanoparticles via Hydrothermal Carbonization

Calderón

Smith

Aracil

et al. 2018

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Nanoscale zerovalent iron (nZVI) has proven to be a promising solution for contaminant remediation, but its application is limited due to its high cost of synthesis and instability. Encapsulating the nZVI in carbon spheres generates more stable particles with improved properties due to the adsorption capacity provided by the carbon. The aim of this work was to synthesize thin shell carbon-encapsulated iron nanoparticles (CE-nFe) through hydrothermal carbonization (HTC) using olive mill wastewater as a carbonaceous source, which is a cheaper and more sustainable method of synthesis than the current practice. With this method, a high quality nanomaterial was obtained, which displayed surface areas up to 220 m 2 /g and was composed of ∼4 nm iron nanoparticles spheres surrounded by a thin layer of carbon (<1 nm). The effect of HTC conditions on the nanoparticle structure and morphology was evaluated. Post-treatment of the samples under nitrogen flow at high temperatures (600−800 °C) was used to increase the ZVI content of the samples. Finally, the synthesized CE-nFe were tested for the removal of heavy metals from water. Thanks to the carbon layer, CE-nFe proved to avoid the delivery of heavy metal ions back to water, a behavior previously observed with nZVI due to its aging after long time periods.

show abstract

Heavy metal release due to aging effect during zero valent iron nanoparticles remediation

Cited by 128 publications

References 34 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

Aging of zero‐valent iron‐based nanoparticles in aqueous environment and the consequent effects on their reactivity and toxicity

Green Synthesis of Thin Shell Carbon-Encapsulated Iron Nanoparticles via Hydrothermal Carbonization

Contact Info

Product

Resources

About