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Photochemical production or depletion of hydrogen peroxide controlled by different electron transfer pathways in methyl viologen intercalated clays

Paper ID Volume ID Publish Year Pages File Format Full-Text
28435 44075 2006 4 PDF Available
Title
Photochemical production or depletion of hydrogen peroxide controlled by different electron transfer pathways in methyl viologen intercalated clays
Abstract

The composites prepared by intercalating methyl viologen (MV2+) into clay lamella could lead to either production or depletion of hydrogen peroxide (H2O2) under UV light irradiation. H2O2 was found to be generated in aerated aqueous dispersion of Laponite intercalated with MV2+ (MV2+–Lap). In contrast, MV2+ intercalated Nontronite (MV2+–Non), promoted the decomposition of H2O2. In both cases, the intercalated MV2+ was excited upon UV irradiation and then captured an electron from clay hosts, through which methyl viologen cation radical (MV+) was formed. In iron free Lap, MV+ reduced the dissolved oxygen to superoxide/hydroperoxie radicals (O2−/HO2) and H2O2 was produced via self-disproportionation. When iron species were present in clay host, however, MV+ reduced structural Fe(III) to Fe(II) in clay lattice, leading to the decomposition of H2O2.

Keywords
Hydrogen peroxide; Clay minerals; Methyl viologen
First Page Preview
Photochemical production or depletion of hydrogen peroxide controlled by different electron transfer pathways in methyl viologen intercalated clays
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 183, Issues 1–2, 30 September 2006, Pages 31–34
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering