Alternative chromium reduction and heavy metal precipitation methods for industrial wastewater

Chang, Li-Yang

doi:10.1002/ep.670220315

Cited by 36 publications

(39 citation statements)

References 19 publications

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“…Sodium metabisulfite, 1) hydrogen sulfide, 2) divalent iron, 37) Fe(II)-bearing minerals, 8) zero valent iron (ZVI), 917) and organic compounds 18) can be used as the reducing agents. Cr(III) in aqueous solutions can precipitate as Cr(OH) 3 in the pH range between 8 and 10.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaCl on Cr(VI) Reduction by Granular Zero Valent Iron (ZVI) in Aqueous Solutions

Ahn

Kim

et al. 2012

Mater. Trans.

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This study examined the effect of NaCl on the removal of Cr(VI) by ZVI in aqueous solutions and proposes a potential mechanism of Cr(VI) removal by ZVI in aqueous solutions with NaCl. A series of batch tests was conducted on ZVI using 100 mg/L Cr(VI) solutions at an initial pH of 3 at various NaCl concentrations. The NaCl in aqueous solutions improved the removal efficiency for Cr(VI) by ZVI. Fe(III)Cr(III) (oxy)hydroxides were precipitated both on the ZVI surface and in the solution via the reduction reactions of Cr(VI) to Cr(III) in the presence of NaCl. The increase in the Cr(VI) removal efficiency in the solutions with NaCl was attributed to the Cl ¹ ions, which accumulate at the anodic sites of ZVI, thereby enhancing ZVI oxidation and colloidal particle formation. In the NaCl solutions, small grains were initially precipitated on the ZVI surface, via relatively fast reactions. The subsequent slowing of these reactions resulted in the precipitation of large grains on the ZVI surface and colloidal particles in the solutions.

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Section: Introductionmentioning

confidence: 99%

Effect of NaCl on Cr(VI) Reduction by Granular Zero Valent Iron (ZVI) in Aqueous Solutions

Ahn

Kim

et al. 2012

Mater. Trans.

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“…After mixing for the desired reaction time, the suspensions were centrifuged at 4000 rpm for 10 minutes and the supernatant solutions were passed through 0.45 µm millipore filters. Chromium concentrations in the supernatant solutions were determined by EPA 7196 Method [23] and adsorbed chromium was determined by the differences between the initial and final solution concentrations. The pH of each sample was also determined.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…These samples were finally kept in plastic bags, ready for further analysis. pH of the soil samples were determined using pH meter (1:1 soil/water suspension method) and the determination of hexavalent chromium in the soil was determined by Colorimetric Method [23]. UV-VIS Spectrophotometer [24] was used for quantification of Cr(VI) as well as the determination of electrical conductivity and temperature of the soil samples ( Table 1).…”

Section: Soil Pre-treatment and Analysismentioning

confidence: 99%

Sorption Characteristics of Hexavalent Chromium in the Soil Based on Batch Experiment and Their Implications to the Environment

Kwikima¹,

Lema²

2017

GEP

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The objective of this experimental study was to determine the kinetics and equilibrium sorption of Cr(VI) in soils collected from Hengshui City of Hebei Province, China, based on batch experiments. The main concentration for this paper is on the effect of soil pH, solute concentration and ionic strength as the variable factors in the sorption of Cr(VI) in soils and the assessment of their implications to the environment. Atomic Absorption Spectrophotometer (AAS) was used for Cr(III) analysis; UV-VIS Spectrophotometer for

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“…For pH < 4.0, the solubility of iron is high and iron precipitation is not quantitative. A classical example is that of Cr [42][43][44]. Soluble Cr VI is reduced at pH 2.0-3.5…”

Section: Ph Variationmentioning

confidence: 99%

Impact of MnO2 on the efficiency of metallic iron for the removal of dissolved CrVI, CuII, MoVI, SbV, UVI and ZnII

Noubactep¹,

Btatkeu

Tchatchueng

2011

Chemical Engineering Journal

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Alternative chromium reduction and heavy metal precipitation methods for industrial wastewater

Cited by 36 publications

References 19 publications

Effect of NaCl on Cr(VI) Reduction by Granular Zero Valent Iron (ZVI) in Aqueous Solutions

Effect of NaCl on Cr(VI) Reduction by Granular Zero Valent Iron (ZVI) in Aqueous Solutions

Sorption Characteristics of Hexavalent Chromium in the Soil Based on Batch Experiment and Their Implications to the Environment

Impact of MnO2 on the efficiency of metallic iron for the removal of dissolved CrVI, CuII, MoVI, SbV, UVI and ZnII

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