Effect of pH, temperature, humic acid and coexisting anions on reduction of Cr(Ⅵ) in the soil leachate by nZVI/Ni bimetal material

Zhu, Fang; Li, Luwei; Ren, Wentao; Deng, Xiaoqiang; Liu, Tao

doi:10.1016/j.envpol.2017.04.074

Cited by 128 publications

(25 citation statements)

References 21 publications

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“…Numerous studies have shown that nZVI can be used in the remediation of soils contamianted with Cr [17][18][19][20]. Our present study further confirms that both B-nZVI and S-nZVI greatly decreased Cr(VI) concentrations in soil, but that S-nZVI was overall more efective than B-nZVI, particularly at a higher dose (three-way ANOVA results, see Table 2).…”

Section: Discussionsupporting

confidence: 87%

“…nZVI has been used to reduce leaching of toxic metals through adsorption, complexation and chemical reduction processes [10][11][12][13][14][15][16]. Numerous studies have reported applications of nZVI in the remediation of soils contaminated with Cr [17][18][19][20] as well as other toxic metals [14][15][16] and organic contaminants [21]. However, bare nZVI readily becomes aggregated and oxidized in aerobic environments, leading to a low remediation efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Sun

Zheng

Wang

et al. 2020

Toxics

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Nano-scale zero-valent iron (nZVI) is among the most common nanoparticles widely used for the treatment of various environmental contaminants. However, little is known about the combined effects of nano-zero-valent iron (nZVI) and other soil amendments on soil remediation and plant performance. For the first time, we studied the remediation of Cr(VI)-contaminated soil using bare nZVI (B-nZVI) and starch-supported nZVI (S-nZVI) in combination with either biochar (BC) or humic acid (HA), and the consequent effects on plant growth and Cr accumulation. Both S-nZVI and B-nZVI decreased the contents of Cr(VI) and available Cr in soil, but increased available Fe content, with S-nZVI generally showing more pronounced effects at a higher dose (1000 mg/kg). B-nZVI exerted no inhibition and even stimulation on plant growth, but 1000 mg/kg S-nZVI produced significant phytotoxicity, resulting in decreased plant growth, low chlorophyll content in leaves, and excessive accumulation of Fe in roots. Each nZVI decreased shoot and root Cr concentrations. BC and HA produced synergistic effects with nZVI on Cr(VI) removal from soil, but HA decreased soil pH and increased the availability of Cr and Fe, implying a potential environmental risk. Addition of BC or HA did not alter the effects of either nZVI on plant growth. In conclusion, combined application of 100 mg/kg nZVI and BC could be an ideal strategy for the remediation of soil contaminated with Cr(VI), whereas high-dose S-nZVI and HA are not recommended in the remediation of agricultural soils for crop production or in the phytostabilization of Cr(VI).

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Sun

Zheng

Wang

et al. 2020

Toxics

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“…The results demonstrated that Clhad no obvious influence on Cr(VI) removal compared to the control samples. In contrast to other studies [32,33], NO 3 inhibited the removal capacity of Cr(VI) in this study (i.e., from 123.20 ± 4.18 mg g -1 for the control to 102.42 ± 4.50 mg g -1 with 5 mM NO 3…”

Section: Effect Of Coexisting Ions and Hacontrasting

confidence: 99%

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

Shao¹,

ShaoYu²,

Xu³

et al. 2019

Desalination and Water Treatment

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Nanoscale zero-valent iron (nZVI) has been proven to be more effective for the treatment of hexavalent chromium(Cr(VI)) when modified with the transition metal Cu. In this study, biochar-supported Cu/Fe bimetallic nanoparticles (Cu-nZVI/BC) were prepared and used for Cr(VI) removal from aqueous solution. The effects of the pH value, the initial concentration of Cr(VI), coexisting ions and humic acids (HA) were investigated. The compositional structures of Cu-nZVI/BC were analyzed by transmission electron microscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The maximum removal efficiency of Cr(VI) was 50.57% (126.41 ± 3.75 mg g-1) for Cu-nZVI/BC at pH 2. The adsorption kinetic data were in agreement with the pseudo-second-order model, which confirmed that the adsorption step was a chemical adsorption and reduction process. The presence of Ca 2+ and NO 3 had an inhibitory effect on Cr(VI) removal, while dHA increased the removal efficiency at high concentrations. This study proves that Cu-nZVI/BC removal of solution Cr(VI) is feasible and shows significant potential in practical applications.

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“…For alkaline soils, due to their high OH − value, they strongly corrode the surface of iron nanoparticles, there is a deficiency of H+ to eliminate this corrosion, and the nanoparticles do not react well with chromium. For these reasons, in acidic soils, favorable conditions exist for the reduction and immobilization of the contaminant [18,45,46].…”

Section: Resultsmentioning

confidence: 99%

Use of Nanoscale Zero-Valent Iron for Remediation of Clayey Soil Contaminated with Hexavalent Chromium: Batch and Column Tests

Reginatto

Cecchin

Heineck

et al. 2020

IJERPH

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This study investigated the reduction of hexavalent chromium (Cr(VI)) in a clayey residual soil using nanoscale zero-valent iron (nZVI). Five different ratios between nZVI and Cr(VI) were tested in batch tests (1000/11; 1000/23; 1000/35; 1000/70, and 1000/140 mg/mg) with the soil. With the selected proportion resulting best efficiency, the column tests were conducted, with molded specimens of 5 cm in diameter and 5 cm in height, with different nZVI injection pressures (10, 30, and 100 kPa). The soil was contaminated with 800 mg/kg of Cr(VI). The Cr(VI) and Cr(III) analyses were performed following the USEPA 3060A and USEPA 7196A standards. The results show that the reduction of Cr(VI) is dependent on the ratio between nZVI and Cr(VI), reaching 98% of efficiency. In column tests, the pressure of 30 kPa was the most efficient. As pressure increased, contaminant leaching increased. The permeability decreased over time due to the gradual increase in filtration and formation of oxyhydroxides, limiting nZVI mobility. Overall, nZVI is efficient for soil remediation with Cr(VI), but the injection process can spread the contaminated if not properly controlled during in situ application.

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Effect of pH, temperature, humic acid and coexisting anions on reduction of Cr(Ⅵ) in the soil leachate by nZVI/Ni bimetal material

Cited by 128 publications

References 21 publications

Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

Use of Nanoscale Zero-Valent Iron for Remediation of Clayey Soil Contaminated with Hexavalent Chromium: Batch and Column Tests

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