Investigating reductive modification of granular ferric hydroxide for enhanced chromate removal

Bahr, Carsten; Massa, Lukas; Stanjek, Helge; Jekel, Martin; Ruhl, Aki Sebastian

doi:10.1016/j.eti.2019.01.002

Cited by 2 publications

(2 citation statements)

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“…Due to the failure of common water adsorbents (activated carbons and metal oxides) which provide large specific surface areas to operate efficiently in the μg/L range of concentrations, research has focused on the development of materials with electron-donating ability. Such capacity will offer a mechanism for Cr(VI) reduction into insoluble Cr(III) species. , Zero-valent iron (ZVI), Fe 3 O 4 , and stannous oxyhydroxides have been reported as the most representative examples of this material category. − …”

Section: Introductionmentioning

confidence: 99%

“…Such capacity will offer a mechanism for Cr(VI) reduction into insoluble Cr(III) species. 12,13 Zero- valent iron (ZVI), Fe 3 O 4 , and stannous oxyhydroxides have been reported as the most representative examples of this material category. 14−16 In this regard, bivalent tin phases contribute two electrons per atom for redox reactions, until they are passivated in the form of Sn 4+ oxides.…”

Section: Introductionmentioning

confidence: 99%

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Tin Oxide Nanoparticles via Solar Vapor Deposition for Hexavalent Chromium Remediation

Simeonidis

Kalaitzidou

Asimakidou

et al. 2023

ACS Appl. Nano Mater.

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Tin oxide nanoparticles optimized to capture low concentrations of hexavalent chromium from water were developed through a facile, scalable, and low-cost one-step solar vapor deposition methodology. Considering the preservation of high electron donation capacity as the key to support the reduction of mobile Cr(VI) into insoluble forms, the growth of SnO nanoparticles was favored by the co-evaporation of SnO 2 with Fe powders at various mass ratios. Characterization techniques indicated that the percentage and the stability of SnO is proportional to the Fe content in the target with a requirement of at least 50% wt to inhibit the formation of a passive SnO 2 surface layer. The produced particles were evaluated regarding their efficiency to capture Cr(VI) under conditions similar to water treatment for drinking purposes (pH 7). It was revealed that passivation-free SnO nanoparticles deliver significant improvement in the adsorption capacity corresponding to the residual concentration of 25 μg/L, reaching a value of 1.74 mg/g for the sample prepared with 50% wt Fe in the target. The increase of water acidity was found responsible for the activation of more reduction sites on the particle surface, as reflected through the elevation of efficiency by more than 20% at pH 6.

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