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Catalytic ozonation of toxic pollutants over magnetic cobalt and manganese co-doped γ-Fe2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
47143 46462 2010 6 PDF Available
Title
Catalytic ozonation of toxic pollutants over magnetic cobalt and manganese co-doped γ-Fe2O3
Abstract

Magnetic Co- and Co, Mn-doped γ-Fe2O3 (FC and FCM) were prepared by co-precipitation method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), in situ attenuated total reflection FTIR (ATR-FTIR) spectroscopy and cyclic voltammetry (CV) analyses. FCM was found to be highly effective for the mineralization of 2,4-dichlorophenoxyacetic acid and its derivatives 2,4-diclorophenol, 2,4,6-trichlorophenol in aqueous solution with ozone. The characterization studies showed that Co and Mn incorporated in γ-Fe2O3 existed as multivalence oxidation states, and there were more Lewis acid sites on the surface of FCM. The interaction of ozone with chemisorbed H2O and surface hydroxyl groups generated from dissociative adsorption of H2O on Lewis acid sites initiated the production of reactive oxygen species. Moreover, a redox process was observed in the catalytic decomposition of O3 at the water–catalyst interface by CV analysis. The results indicated that the introduction of Mn not only increased the surface Lewis acid sites of FCM to cause more surface hydroxyl groups and chemisorbed water, but also enhanced the interfacial electron transfer, resulting in higher activity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Magnetic Co, Mn-doped γ-Fe2O3 was found to be highly effective for the mineralization of 2,4-dichlorophenoxyacetic acid and its derivatives 2,4-diclorophenol, 2,4,6-trichlorophenol in aqueous solution with ozone. ▶ The higher reactivity was contributed to multivalence oxidation states and more Lewis acid sites on the surface of Co, Mn-doped γ-Fe2O3.

Keywords
ATR-FTIR; Catalytic ozonation; Magnetic catalyst; Multivalence; Surface Lewis acid sites
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Catalytic ozonation of toxic pollutants over magnetic cobalt and manganese co-doped γ-Fe2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 100, Issues 1–2, 11 October 2010, Pages 62–67
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us