Combined nano-biotechnology for in-situ remediation of mixed contamination of groundwater by hexavalent chromium and chlorinated solvents

Němeček, Jan; Pokorný, Petr; Lhotský, Ondřej; Knytl, Vladislav; Najmanová, Petra; Steinová, Jana; Černík, Miroslav; Filipová, Alena; Filip, Jan; Cajthaml, Tomáš

doi:10.1016/j.scitotenv.2016.01.019

Cited by 92 publications

(29 citation statements)

References 56 publications

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“…Heterogeneous catalytic removal of pollutants from water with the use of nano zero-valent iron (nZVI) was studied in detail by many authors [148][149][150][151][152][153]. nZVI has been applied at many contaminated sites (in situ) where it not only adsorbs and reduces contaminants but also enhances bioremediation [154,155]. Both in situ applied oxidants (ISCO) and reductants like nZVI are interesting examples of how heterogeneous catalysis can improve groundwater quality.…”

Section: Water / Wastewater / Soilmentioning

confidence: 99%

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

Wacławek

Padil

Černík

2018

Ecological Chemistry and Engineering S

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Heterogeneous catalysis is one of the fastest developing branches of chemistry. Moreover, it is strongly connected to popular environment-related applications. Owing to the very fast changes in this field, for example, numerous discoveries in nanoscience and nanotechnologies, it is believed that an update of the literature on heterogeneous catalysis could be beneficial. This review not only covers the new developments of heterogeneous catalysis in environmental sciences but also touches its historical aspects. A short introduction to the mechanism of heterogeneous catalysis with a small section on advances in this field has also been elaborated. In the first part, recent innovations in the field of catalytic air, water, wastewater and soil treatment are presented, whereas in the second part, innovations in the use of heterogeneous catalysis for obtaining sustainable energy and chemicals are discussed. Catalytic processes are ubiquitous in all branches of chemistry and there are still many unsolved issues concerning them.

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Section: Water / Wastewater / Soilmentioning

confidence: 99%

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

Wacławek

Padil

Černík

2018

Ecological Chemistry and Engineering S

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“…FTIR spectra were obtained using a spectrophotometer (NICOLET IZ10, Thermo Scientic, USA). The instrument was equipped with a single reection single angle 45 horizontal ATR accessory. Spectra were generated with a resolution of 4 cm À1 , spanning the 4000-400 cm…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

“…Furthermore, to estimate the importance of direct removal, calculation of the chlorine number was undertaken. 45 The chlorine number (weighted average number of Cl atoms per molecule of ethene) of the groundwater ranged from 3.1 to 4 during the experimental period (ESI Fig. S1 †).…”

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confidence: 99%

Gum karaya (Sterculia urens) stabilized zero-valent iron nanoparticles: characterization and applications for the removal of chromium and volatile organic pollutants from water

et al. 2017

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This paper illustrates a method for the stabilization of nanoscale zerovalent iron (NZVI) suspensions with a "green" biopolymer, Gum Karaya (GK). The stability, sedimentation, aggregation behavior and reactivity towards Cr(VI) and volatile organic compounds using NZVI-GK (GK stabilized NZVI) and bare NZVI, were assessed. The stabilization mechanism of NZVI-GK was demonstrated using ATR-FTIR, XRD, XPS, TEM, SEM, TGA and particle size analysis. The NZVI-GK nanoparticle suspension was found to be stable for at least three months, suggesting a superior stability rendering property of GK which forms a scaffold to prevent NZVI from aggregating. Batch experiments, centred on Cr(VI) reduction and degradation of volatile organic compounds, confirmed that NZVI-GK was more reactive than bare NZVI. Furthermore, XPS and ICP-MS results revealed that Cr(VI) was reduced to Cr(III) by NZVI-GK and the remaining Cr(III) insolution was adsorbed onto GK, thereby completely removing chromium from the contaminated water.Our study suggests that an important role is played due to the attributes of GK (which include nontoxicity, biodegradability and cost-effectiveness) in conjunction with the ability of NZVI to remove all chromium viz. [Cr(VI) and Cr(III)] coupled with the total degradation and removal of VOCs (cis-1,2-dichloroethene, perchloroethene and trichloroethene) from water.

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“…4. The field data are presented and discussed in relation to bioremediation in the paper of Němeček et al [3], and solely the effect of nZVI on Cr(VI)-contaminated groundwater is demonstrated in the paper of Němeček et al [33].…”

Section: Figure 2: Changes In Eh (A) and Concentrations Of Cis-dce (Bmentioning

confidence: 99%

“…The innovative nanomaterials are beneficial to this purpose because of their high reactivity (especially metallic nanoparticles [1]) and sorption capacity (metal oxide nanoparticles [2]). The iron based materials proved to be promising material due to the availability of iron-bearing precursors and versatility of Fe in its various oxidation states while Fe0/II is a reducing agent [3], FeIV/V/VI is a strong oxidant [4]. Furthermore, the non-toxic iron oxyhydroxides are the final reaction products of Fe-based (nano) materials [5], [6]; these minerals show the similar properties as their naturally occurring analogues [7].…”

Section: Introductionmentioning

confidence: 99%

Redox Properties of Iron-Based Materials in Water Treatment Technologies: An Overview of Laboratory Versus Field Experiences

Filip¹,

Skácelová²,

Zajíček³

et al. 2017

WIT Transactions on Ecology and the Environment

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In this paper, iron-bearing compounds where the iron atoms are in different oxidation states (i.e. metallic iron on one side and superoxide with iron VI on the other side) are introduced and their applicability for water treatment is clearly demonstrated. The versatility of iron atoms in various forms (mainly in variable oxidation states) could cover broad range of water treatment technologies (reduction, sorption, oxidation, and combined technologies even in relation to biotechnologies and other physical fields -electric and/or magnetic) when iron is in reduced (Fe0), oxidized (FeII,III), or superoxide (FeIV,V,VI) state, respectively. Thus, they could cover treatment of broad range of pollutants (organic compound like TCE, PCE, DCE, BTEX; inorganic compounds including heavy metals, CrVI, arsenic, metal cyanides, nitro-compounds; as well as emerging contaminants from the broad family of pharmaceuticals, endocrine disruptors, pesticides and herbicides). Such technologies proved to be well applicable and cost-effective in many cases, environmentally-friendly with formation of non-toxic iron oxides (i.e. environmentally benign product with sorption/coagulation properties and also magnetic properties allowing magnetic separation of reaction products from the treated media) representing, thus, competitive alternative to conventional water-treatment technologies. The high potential of the presented technologies lies mainly in the restoration of polluted groundwater and soil environment, waste-and surface-water treatment, as well as in the treatment of drinking water where fast and highly-efficient elimination of particular compounds and/or microorganisms is a key parameter.

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Combined nano-biotechnology for in-situ remediation of mixed contamination of groundwater by hexavalent chromium and chlorinated solvents

Cited by 92 publications

References 56 publications

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

Gum karaya (Sterculia urens) stabilized zero-valent iron nanoparticles: characterization and applications for the removal of chromium and volatile organic pollutants from water

Redox Properties of Iron-Based Materials in Water Treatment Technologies: An Overview of Laboratory Versus Field Experiences

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