Graphene-Alginate Fluids as Unconventional Electrodes for the Electrokinetic Remediation of Cr(VI)

Telepanich, Alicia; Marshall, Tatianna; Gregori, Stefano; Marangoni, Alejandro G.; Pensini, Erica

doi:10.1007/s11270-021-05278-x

Cited by 9 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Graphene nanoplatelets were purchased from Sigma-Aldrich (NP, graphene nanoplatelets, surface area 500 m 2 /g, GNP-s, xGnP). The graphene nanoplatelets used were characterized in our recent study . Ottawa sand (W+I, BDH9274) was purchased from VWR (Canada).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Zein-Bonded Graphene and Biosurfactants Enable the Electrokinetic Clean-Up of Hydrocarbons

et al. 2021

Self Cite

View full text Add to dashboard Cite

Nonaqueous phase liquids (NAPL, e.g., hydrocarbons and chlorinated compounds) are common groundwater pollutants. Electrokinetic remediation of NAPLs uses electric fields to draw them toward electrodes and remove them from groundwater. The treatment requires NAPL mobility. Emulsification increases mobility, but at a risk for downstream receptors. We propose using alkaline aqueous solutions of zein and graphene nanoparticles (GNP) to form conductive materials, which could also act as barriers to control NAPL migration. Alkaline zein−GNP solutions can be injected in the polluted soil and solidified by neutralizing the pH (e.g., with glacial acetic acid, GAA). Shear rheology experiments showed that zein−GNP composites were cohesive, and voltammetry showed that GNP increased electrical conductivity of zein-based materials by 3.5 times. Gas chromatography−mass spectroscopy (GC−MS) demonstrated that the electrokinetic treatment of model sandy aquifers yielded >60% and ∼47% removal of emulsified toluene in freshwater and in salt solutions, respectively (with 30 min treatment using a 10 V differential voltage between a zein−GNP and an aluminum electrode. NaCl was used as model salt contaminant. The conductivity of surfactant solutions was lower in saline water than in freshwater, explaining differences in toluene removal. Toluene−water emulsions were stabilized using the natural surfactants lecithin and saponin. These surfactants acted synergistically in stabilizing emulsions in either freshwater or salt solutions. Lecithin and saponin likely interacted at toluene−water interfaces, as indicated by the morphology, interfacial tension and compressional rigidity of toluene−water interfaces with both components (relative to interfaces of either lecithin or saponin alone). The compressional behavior of interfacial films was well-described by the Marczak model. Electrokinetic treatment of saturated model sandy aquifers also decreased the turbidity of emulsions of water and either tricholoroethylene (TCE, by ∼41%) or diesel (by ∼75%), in the presence of a bacterial biosurfactant. This decrease was used as semiquantitative indicator of NAPL removal from water.

show abstract

Section: Methodsmentioning

confidence: 99%

“…The graphene nanoplatelets used were characterized in our recent study. 40 Ottawa sand (W+I, BDH9274) was purchased from VWR (Canada). Aluminum electrodes (size = 9.8 cm × 1.8 cm × 1 mm) were purchased from a local metal shop.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Zein-Bonded Graphene and Biosurfactants Enable the Electrokinetic Clean-Up of Hydrocarbons

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Combining biodegradable ethylenediamine disuccinic acid (EDDS) and near anode electrokinetic (AA-EK) technology can enhance the removal rate of heavy metals during electrokinetic sludge remediation [22]. Graphene-alginate can act as an unconventional electrode to adsorb Cr(VI), which provides proof-of-concept for a novel repair method [23]. Previous electrokinetic remediation experiments of chromium-contaminated natural fine sand aquifers analyzed changes in current, pH, and conductivity during electrokinetic remediation [24].…”

Section: Introductionmentioning

confidence: 99%

Study on Water-Heat-Solution Transport Law in Cr(VI)-Contaminated Soil during Electric Remediation

et al. 2022

View full text Add to dashboard Cite

In order to understand the water-thermal-solute transport pattern during the electrokinetic remediation of Cr(VI)-contaminated soil, this study selected 2.46 m3 of Cr(VI)-contaminated soil from a chemical plant plot for an indoor experiment of electrokinetic remediation, which monitored the changes of three indicators of soil volumetric water content, temperature and Cr(VI) content over time under the conditions of a voltage of 90 V and 110 V and an electrode distance of 1.5 m for 7 days. A numerical model was also developed using the finite element software COMSOL, which was evaluated and calibrated to predict the changes in soil volumetric water content and hexavalent chromium concentration within 15 days. The results showed that the soil volumetric water content near the anode showed a decreasing trend at the beginning, and then gradually increased when the external supplemental water arrived. The decrease in soil volume water content became larger when the voltage increased. During the electrokinetic remediation experiment, the maximum temperature could reach 36.9 °C at 5 cm from the anode under the conditions of 90 V and 1.5 m distance between electrodes, while the maximum temperature could reach 52.4 °C at a voltage of 110 V. Moreover, the higher the voltage, the faster the temperature rise of the soil at the same location. A higher voltage increased the removal rate of hexavalent chromium, and the removal rate of hexavalent chromium in shallow soils was higher than that in deep soils. At 90 V and an electrode distance of 1.5 m, the removal rates of hexavalent chromium at sampling points 6 and 7 reached 66.03% and 60.80%, respectively. The removal rates of points 6 and 7 at 110 V were able to reach 75.96% and 70.74%, respectively.

show abstract

Separation of Cr(VI), acetonitrile, and tetrahydrofuran from water using reducing sugars and HCl

Telepanich

Marshall

Marangoni

et al. 2022

Water Air Soil Pollut

View full text Add to dashboard Cite

Graphene-Alginate Fluids as Unconventional Electrodes for the Electrokinetic Remediation of Cr(VI)

Cited by 9 publications

References 48 publications

Zein-Bonded Graphene and Biosurfactants Enable the Electrokinetic Clean-Up of Hydrocarbons

Zein-Bonded Graphene and Biosurfactants Enable the Electrokinetic Clean-Up of Hydrocarbons

Study on Water-Heat-Solution Transport Law in Cr(VI)-Contaminated Soil during Electric Remediation

Separation of Cr(VI), acetonitrile, and tetrahydrofuran from water using reducing sugars and HCl

Contact Info

Product

Resources

About