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Visible light enhanced Cr(VI) removal from aqueous solution by nanoparticulated zerovalent iron

Paper ID Volume ID Publish Year Pages File Format Full-Text
50155 46783 2014 4 PDF Available
Title
Visible light enhanced Cr(VI) removal from aqueous solution by nanoparticulated zerovalent iron
Abstract

•Cr(VI) removal with nanoparticulated zerovalent iron enhanced under visible light.•The external iron oxides promote a heterogeneous photocatalytic process.•The iron oxides act as semiconductors overcoming the passivation of the material.

Cr(VI) removal using nanoparticulated zerovalent iron is enhanced under visible light in comparison with the dark process. Using an Fe:Cr(VI) molar ratio (MR) of 1, 77% removal was obtained after two hours under irradiation, compared with 60% in dark conditions; use of MR 2 allowed almost total Cr(VI) removal. Experiments with selected filters indicated that active wavelengths are above 555 nm. The proposed mechanism involves a heterogeneous photocatalytic process promoted by the iron oxides present as an external layer of the nanoparticles acting as semiconductors after excitation with light, overcoming the passivation of the material taking place in the dark.

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Keywords
Nanoparticulated zerovalent iron; Hexavalent chromium; Visible light; Iron oxides
First Page Preview
Visible light enhanced Cr(VI) removal from aqueous solution by nanoparticulated zerovalent iron
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 46, 10 February 2014, Pages 57–60
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis