NDLI: Reduction of hexavalent chromium mediated by micron- and nano-scale zero-valent metallic particles

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Reduction of hexavalent chromium mediated by micron- and nano-scale zero-valent metallic particles

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Reduction of hexavalent chromium mediated by micron- and nano-scale zero-valent metallic particles

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rivero-Huguet, Mario Marshall, William D.
Description	Author Affiliation: Rivero-Huguet M ( Department of Food Science and Agricultural Chemistry, McGill University, 21,111 Lakeshore Road, Ste-Anne-de-Bellevue, Qc, Canada H9X 3V9.)
Abstract	A variety of zero-valent metals $(Al^{0},$ $Cu^{0},$ $Fe^{0},$ $Mg^{0},$ $Ni^{0},$ $Si^{0}$ and $Zn^{0}),$ and $Cu^{0}$ and $Fe^{0}$ nano-sized particles were evaluated for reactivity towards the reduction of Cr(VI) in a surfactant preparation $(Tween^{®}$ 20) under a selection of reaction conditions. At circum neutral pHs, a rapid inactivation of the surface was observed for almost all of the tested metals and complete reduction of Cr(VI) was achieved at acidic pH only by using $Cu^{0},$ $Fe^{0},$ $Mg^{0}$ or $Zn^{0}.$ A considerable increase in reactivity (up to 100-fold) was observed for reductive remediation with nano-sized particles. The use of a solid support as a dispersant and stabilizer circumvented the tendency of freshly prepared nano-particles to either react with surrounding media or agglomerate, resulting in the formation of much larger flocs and appreciable loss in reactivity. The formation of clusters by polymeric structures provided an extra protection of the nano-particle surface with a striking improvement in their reactivity mainly at more alkaline conditions. Therefore the incorporation of an innocuous stabilizer can substantially enhance the stability of nano-particles for environmental transformations.
File Format	HTM / HTML
ISSN	14640325
Issue Number	5
Journal	Journal of Environmental Monitoring
Volume Number	11
e-ISSN	14640333
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2009-05-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Environmental Health Chromium Chemistry Metal Nanoparticles Oxidation-reduction Polysorbates Spectrophotometry, Atomic Surface-active Agents Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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Reduction of Hexavalent Chromium from Soil of the Relocated Factory Area with Rice Straw Hydrothermal Carbon Modified by Nano Zero-Valent Iron (nZVI).

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Uncertainties when using dual-wavelength or single-wavelength spectrophotometry to monitor the course of hexavalent chromium reduction mediated by zero-valent iron

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Removal of Hexavalent Chromium in Aqueous Solution by Cellulose Filter Paper Loaded with Nano-Zero-Valent Iron: Performance Investigation and Numerical Modeling.

Reduction of hexavalent chromium mediated by micron- and nano-scale zero-valent metallic particles

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Reduction of hexavalent chromium mediated by micron- and nano-scale zero-valent metallic particles