Comparison of Cr(VI) adsorption and photocatalytic reduction efficiency using leonardite powder

Arslan, Hüdaverdi; Eskikaya, Ozan; Bilici, Zeynep; Dizge, Nadir

doi:10.1016/j.chemosphere.2022.134492

Cited by 58 publications

(19 citation statements)

References 63 publications

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“…38 Cr(VI) concentrations on the surface of the solid phase (desorbable Cr(VI)) and in the liquid phase (aqueous Cr(VI)) were determined with the 1,5-diphenylcarbazide spectrophotometry at the wavelength of 540 nm using a UV−visible spectrophotometer (UV2400, SDPTOP, China). 39 Nondesorbable Cr(VI) concentration was obtained by subtracting the desorbable Cr(VI) and aqueous Cr(VI) concentration from the total Cr(VI) concentration in the suspension. Total iron and total Mn concentrations in the liquid phase during the conversion of ferrihydrite were determined using a flame atomic absorption spectrometer (Z2000, Hitachi, Japan).…”

Section: Co-precipitate Transformationmentioning

confidence: 99%

Effect of Mn(II) and Phytic Acid on Cr(VI) in the Ferrihydrite-Cr(VI) Co-precipitates: Implication for the Migration Behavior of Cr(VI)

Sun

Chrysikopoulos

2022

ACS EST Water

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Understanding the influences of ferrihydrite conversion and co-existing substances on the migration of Cr(VI) in the co-precipitates of ferrihydrite and Cr(VI) (Fh–Cr) is helpful in predicting the migration path of Cr(VI). This work studied the influence of phytic acid on the immobilization of Cr(VI) in ferrihydrite and the migration of Cr(VI) in the presence of phytic acid and Mn(II). The results revealed that phytic acid hindered the retention of Cr(VI) in ferrihydrite and the conversion of ferrihydrite to goethite and hematite. Phytic acid inhibited the formation of hematite by inhibiting ferrihydrite particle aggregation, and the combination of phytic acid and iron ions prevented the formation of goethite. Although phytic acid significantly retarded the conversion of Fh–Cr, it did not hinder the migration of Cr(VI). Besides, the presence of Mn(II) eliminated the negative effect of phytic acid on the immobilization of Cr(VI) in ferrihydrite. The results of this study were helpful in understanding the interaction among ferrihydrite, phytic acid, Mn(II), and the migration path of Cr(VI) during the conversion.

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Section: Co-precipitate Transformationmentioning

confidence: 99%

Effect of Mn(II) and Phytic Acid on Cr(VI) in the Ferrihydrite-Cr(VI) Co-precipitates: Implication for the Migration Behavior of Cr(VI)

Sun

Chrysikopoulos

2022

ACS EST Water

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“…Even though industrial effluents account for the primary sources of heavy metal pollution, several studies have shown the equally serious threats posed by the presence of such contaminants in different water sources (Mwanamoki et al, 2015) (Arslan et al, 2022). Due to the varying characteristics and water qualities, the application of adsorbents in removing heavy metals from these various contaminated water sources can differ in terms of their effectiveness and performance (Sridhar et al, 2017).…”

Section: Factors Affecting the Adsorption Capacitymentioning

confidence: 99%

Remediation of heavy metal polluted waters using activated carbon from lignocellulosic biomass: An update of recent trends

et al. 2022

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“…For example, Arslan et al used leonardite powder for photocatalytic reduction of 10 mg L −1 Cr(VI) in the presence of lamp light. 22 Djellabi et al used TiO 2 for the photocatalytic reduction of Cr(VI) in the presence of sunlight, 23 whereas Misra et al used Au@CNT@TiO 2 nanocomposites and Boruah et al used Fe 3 O 4 /rGO nanocomposites 25 for the same process. Yadav et al used a Pt@ MIL-101 catalyst and formic acid as a cocatalyst for the reduction of Cr(VI).…”

Section: ■ Introductionmentioning

confidence: 99%

H₂O₂-Free Sunlight-Promoted Photo-Fenton-Type Removal of Hexavalent Chromium Using Reduced Iron Oxide Dust

et al. 2022

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Herein, we explored a simple approach to using readily available low-cost industrial waste from steel industries known as red-colored iron oxide dust (IOD). After that, it was used for the sunlight-assisted photo removal of another toxic waste material (hexavalent chromium (Cr(VI)) from the aqueous medium showing the photo-Fenton-type mechanism, importantly without using hydrogen peroxide. The photoactive properties of chemically reduced IOD (r-IOD) have been explored to remove toxic Cr(VI) in the presence of two different sources of light (sunlight and artificial bulb light). Kinetic studies and various control experiments have been performed to check the comparative photocatalytic performance of IOD versus r-IOD nanoparticles. The values of the half-life of Cr(VI) removal strongly support the significant influence of the sun on the faster rate for the removal of ∼250 mg L −1 Cr(VI). To maintain the lower pH needed for Cr(VI) reduction, a small quantity of formic acid was used, which can be removed easily by forming CO 2 and H 2 O. The radical trapping experiments and spectroscopic investigations of residue products obtained after the photoreduction process have been explored to support the mechanistic investigation involved in the sunlight-promoted photoreduction of Cr(VI).

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Comparison of Cr(VI) adsorption and photocatalytic reduction efficiency using leonardite powder

Cited by 58 publications

References 63 publications

Effect of Mn(II) and Phytic Acid on Cr(VI) in the Ferrihydrite-Cr(VI) Co-precipitates: Implication for the Migration Behavior of Cr(VI)

Effect of Mn(II) and Phytic Acid on Cr(VI) in the Ferrihydrite-Cr(VI) Co-precipitates: Implication for the Migration Behavior of Cr(VI)

Remediation of heavy metal polluted waters using activated carbon from lignocellulosic biomass: An update of recent trends

H₂O₂-Free Sunlight-Promoted Photo-Fenton-Type Removal of Hexavalent Chromium Using Reduced Iron Oxide Dust

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Comparison of Cr(VI) adsorption and photocatalytic reduction efficiency using leonardite powder

Cited by 58 publications

References 63 publications

Effect of Mn(II) and Phytic Acid on Cr(VI) in the Ferrihydrite-Cr(VI) Co-precipitates: Implication for the Migration Behavior of Cr(VI)

Effect of Mn(II) and Phytic Acid on Cr(VI) in the Ferrihydrite-Cr(VI) Co-precipitates: Implication for the Migration Behavior of Cr(VI)

Remediation of heavy metal polluted waters using activated carbon from lignocellulosic biomass: An update of recent trends

H2O2-Free Sunlight-Promoted Photo-Fenton-Type Removal of Hexavalent Chromium Using Reduced Iron Oxide Dust

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Product

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H₂O₂-Free Sunlight-Promoted Photo-Fenton-Type Removal of Hexavalent Chromium Using Reduced Iron Oxide Dust