Zero-Valent Iron Removal Rates of Aqueous Cr(VI) Measured Under Flow Conditions

Kaplan, Daniel I.; Gilmore, Tyler J.

doi:10.1023/b:wate.0000026518.23591.ac

Cited by 38 publications

(27 citation statements)

References 16 publications

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“…Lee et al (2003) evaluated the removal rate of Cr(VI) in the presence of commercial ZVI, waste ZVI and a mixture of oxidized ZVI and microbial iron-reducing consortium, suggesting that Cr(VI) reduction followed a first-order reaction. Using three sand-ZVI mixtures and three types of aqueous phases, Kaplan and Gilmore (2004) noted that changing the ZVI content in the column had no significant effect on the magnitude of the pseudofirst-order rate constant, which could indicate that other reactions, such as Fe(II) reduction or Cr(VI) sorption, may have played an important role in the removal of Cr(VI) from the solution. Assuming a first-order reaction, El-Shazly et al (2005) studied the effect of solution velocity and temperature on the reduction rate constant using a fixed bed of bearing ZVI spheres.…”

Section: Kinetics Of Cr(vi) Reduction By Zvimentioning

confidence: 97%

Hexavalent Chromium Reduction with Zero-Valent Iron (ZVI) in Aquatic Systems

Gheju

2011

Water Air Soil Pollut

324

186

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Hexavalent chromium is a heavy metal used in a variety of industrial applications which is highly toxic to humans, animals, plants and microorganisms. Moreover, it is a well-established human carcinogen by the inhalation route of exposure and a possible human carcinogen by the oral route of exposure. Therefore, it should be removed from contaminated waters. Its reduction to trivalent chromium can be beneficial because a more mobile and more toxic chromium species is converted to a less mobile and less toxic form. During the last two decades, there has been important interest in using zero-valent iron (ZVI) as a Cr(VI)-reducing agent. A considerable volume of research has been carried out in order to investigate the mechanism and kinetics of Cr(VI) reduction with ZVI, as well as the influence of various parameters controlling the reduction efficiency. Therefore, the purpose of this review was to provide updated information regarding the developments and innovative approaches in the use of ZVI for the treatment of Cr(VI)-polluted waters.

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Section: Kinetics Of Cr(vi) Reduction By Zvimentioning

confidence: 97%

Hexavalent Chromium Reduction with Zero-Valent Iron (ZVI) in Aquatic Systems

Gheju

2011

Water Air Soil Pollut

324

186

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“…The particle size was between 2.0 and 4.0 mm. Sand was used as an adsorbent because of its worldwide availability and its use as admixing agent in Fe 0 barriers [11][12][13]. The adsorption capacity of sand for MB has been systematically documented in 1955 by Mitchell et al [37].…”

Section: Sandmentioning

confidence: 99%

“…Accordingly, treatability tests for the design of Fe 0 barriers were typically done with columns containing 100% Fe 0 . At some sites, Fe 0 had to be mixed with sand to meet width requirements and/or save Fe 0 costs [11][12][13][14]. For such Fe 0 /sand systems, appropriate scaling factors were sought to account for a decrease in reactivity [13].…”

Section: Introductionmentioning

confidence: 99%

Characterizing the impact of sand addition on the efficiency of granular iron for contaminant removal in batch systems

Miyajima¹,

Noubactep²

2015

Chemical Engineering Journal

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“…There are many researches in which ZVI particle is used to treat chromate for groundwater and wastewater in medium pH through batch modes [2,[5][6][7][8][9][10][11][12][13][14]. These researches all concluded that chromate reduction efficiencies could be enhanced through increase in acidity.…”

Section: Introductionmentioning

confidence: 98%