Highly efficient removal of Cr(VI) from water with nanoparticulated zerovalent iron: Understanding the Fe(III)–Cr(III) passive outer layer structure

Montesinos, V. Nahuel; Quici, Natalia; Halac, Emilia B.; Leyva, A.G.; Custo, Graciela; Bengió, S.; Zampieri, G.; Litter, Marta I.

doi:10.1016/j.cej.2014.01.093

Cited by 125 publications

(60 citation statements)

References 39 publications

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“…nZVI possesses a large removal capacity, fast kinetics and high reactivity for the degradation/removal of many chemical pollutants, such as orange II [8], crystal violet [9] and metronidazole [10]. It has also been confirmed that nZVI has a rapid rate of Cr(VI) removal [11] and could have an enhanced reactivity for Cr(VI) removal compared with other similar materials [12]. However, nZVI particles are prone to aggregation and inactivity in aqueous solution due to their properties of a high surface energy, magnetization and high reactivity [13], which result in a decrease in their reactivity limiting the application of nZVI particles in the remediation of contaminants.…”

Section: Introductionmentioning

confidence: 73%

“…9c, the peaks at BE of around 586.5, 577.5 and 576.2 eV corresponded to the Cr 2p photoelectrons, which could be assigned to Cr(OH) 3 and/or Cr 2 O 3 [12,29]. The result indicated the inexistence of Cr(VI) on the surface of iron particles, Montesinos et al [12] also suggested that Cr(VI) was instantaneously reduced when absorption occurred on the iron surface. The results of XRD and XPS proved that Cr(VI) was effectively reduced to Cr(III) by nZVI.…”

Section: Characterizationmentioning

confidence: 87%

See 1 more Smart Citation

Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(VI) removal

Zhou

et al. 2015

Chemical Engineering Journal

102

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Section: Introductionmentioning

confidence: 73%

Section: Characterizationmentioning

confidence: 87%

Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(VI) removal

Zhou

et al. 2015

Chemical Engineering Journal

102

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“…In contrast to CrO 4 2− , HCrO 4 − with a higher redox potential (1.33 V) can readily get reduced to Cr (III) (Geranio 2007;Loyaux-Lawniczak et al 2000). Therefore, the reduction of Cr (VI) to Cr (III) is an effective approach to remediating the Cr (VI) contamination (Montesinos et al 2014;Qiu et al 2014;Huang et al 2014). …”

Section: Introductionmentioning

confidence: 96%

“…The effluents from the industries contain Cr (III) and Cr (VI) at concentrations ranging from tenths to hundreds of milligrams per liter (Rashmi et al 2013). Chromium exists primarily in two valence states, i.e., trivalent and hexavalent Cr (Montesinos et al 2014). Cr (III) is a micronutrient important in the biological activity of insulin; it is relatively stable and has a low solubility in aqueous solution (Qiu et al 2014).…”

Section: Introductionmentioning

confidence: 99%

A comparative study with biologically and chemically synthesized nZVI: applications in Cr (VI) removal and ecotoxicity assessment using indigenous microorganisms from chromium-contaminated site

Ravikumar

Kumar

Rajeshwari

et al. 2015

Environ Sci Pollut Res

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In the present communication, we report a comparative study of Cr (VI) removal using biologically synthesized nano zero valent iron (BS-nZVI) and chemically synthesized nZVI (CS-nZVI), both immobilized in calcium alginate beads. The parameters like initial Cr (VI) concentration, nZVI concentration, and the contact time for Cr (VI) removal were optimized based on Box-Behnken design (BBD) by response surface modeling at a constant pH 7. Under the optimized conditions (concentration of nZVI = 1000 mg L(-1), contact time = ∼ 80 min, and initial concentration of Cr (VI) = 10 mg L(-1)), the Cr (VI) removal by the immobilized BS-nZVI and CS-nZVI alginate beads was 80.04 and 81.08 %, respectively. The adsorption of Cr (VI) onto the surface of alginate beads was confirmed by scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM-EDX), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) analysis. The applicability of the process using both the sorbents was successfully test medium Cr (VI) spiked environmental water samples. In order to assess the ecotoxic effects of nZVI, the decline in cell viability, generation of intracellular reactive oxygen species (ROS), cell membrane damage, and biouptake was studied at 1000 mg L(-1) concentration, with five indigenous bacterial isolates from chromium-contaminated lake sediments and their consortium.

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“…Since the surface of commercially Fe 0 materials is permanently covered by an outer layer of low electric conductive air-formed oxides (hematite, maghemite) [64], the electron transport from Fe 0 to Cr VI should be severely inhibited [69][70][71][72][73][74][75][76][77][78][79]. Moreover, Fe 0 efficiency should significantly decrease during the time, as its surface is progressively covered with additional secondary mineral coatings that prevents penetration of the Cr VI and stops the electron transfer [11,[80][81][82]. As a result, removal of Cr VI in Fe 0 /H 2 O systems via direct reduction with Fe 0 should, theoretically, have a very low efficiency [83][84][85][86].…”

Section: More Recent Laboratory-scale Reports (Post Elisabeth City Prb)mentioning

confidence: 99%

Progress in Understanding the Mechanism of CrVI Removal in Fe0-Based Filtration Systems

Gheju¹

2018

Water

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Hexavalent chromium (Cr VI ) compounds are used in a variety of industrial applications and, as a result, large quantities of Cr VI have been released into the environment due to inadequate precautionary measures or accidental releases. Cr VI is highly toxic to most living organisms and a known human carcinogen by inhalation route of exposure. Another major issue of concern about Cr VI compounds is their high mobility, which easily leads to contamination of surface waters, soil, and ground waters. In recent years, attention has been focused on the use of metallic iron (Fe 0 ) for the abatement of Cr VI polluted waters. Despite a great deal of research, the mechanisms behind the efficient aqueous Cr VI removal in the presence of Fe 0 (Fe 0 /H 2 O systems) remain deeply controversial. The introduction of the Fe 0 -based filtration technology, at the beginning of 1990s, was coupled with the broad consensus that direct reduction of Cr VI by Fe 0 was followed by co-precipitation of resulted cations (Cr III , Fe III ). This view is still the dominant removal mechanism (reductive-precipitation mechanism) within the Fe 0 remediation industry. An overview on the literature on the Cr geochemistry suggests that the reductive-precipitation theory should never have been adopted. Moreover, recent investigations recalling that a Fe 0 /H 2 O system is an ion-selective one in which electrostatic interactions are of primordial importance is generally overlooked. The present work critically reviews existing knowledge on the Fe 0 /Cr VI /H 2 O and Cr VI /H 2 O systems, and clearly demonstrates that direct reduction with Fe 0 followed by precipitation is not acceptable, under environmental relevant conditions, as the sole/main mechanism of Cr VI removal in the presence of Fe 0 .

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Highly efficient removal of Cr(VI) from water with nanoparticulated zerovalent iron: Understanding the Fe(III)–Cr(III) passive outer layer structure

Cited by 125 publications

References 39 publications

Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(VI) removal

Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(VI) removal

A comparative study with biologically and chemically synthesized nZVI: applications in Cr (VI) removal and ecotoxicity assessment using indigenous microorganisms from chromium-contaminated site

Progress in Understanding the Mechanism of CrVI Removal in Fe0-Based Filtration Systems

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