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Synthesis of nanosized biogenic magnetite and comparison of its catalytic activity in ozonation

Paper ID Volume ID Publish Year Pages File Format Full-Text
48153 46495 2008 6 PDF Available
Title
Synthesis of nanosized biogenic magnetite and comparison of its catalytic activity in ozonation
Abstract

Nanosized biogenic iron oxide was synthesized by dissimilatory iron-reducing bacterium, Shewanella sp. This biogenic iron oxide was evaluated as a catalyst in the heterogeneous catalytic ozonation of para-chlorobenzoic acid (pCBA). XRD and TEM analyses showed that the biogenic iron oxide was magnetite phase (Fe3O4) and was composed of nanosized irregular particles in the range of 10.0 ± 4.0 nm in diameter. Catalytic ozonation was carried out at acidic pH levels (∼2.5) in the presence of the biogenic magnetite. It was clearly shown that the biogenic magnetite enhanced the degradation of pCBA by the production of OH resulting from the catalytic decomposition of ozone on the surface of the particles. Functional groups on the surface of the biogenic magnetite played a role of catalytic active sites, and this was confirmed by FT-IR and titration analyses. However, the biogenic magnetite showed a lower catalytic efficiency than the commercial nanosized magnetite, resulted from the formation of 4 times bigger aggregates of the biogenic magnetite than the commercial one in aqueous solutions. The Rct values representing the ratio of hydroxyl radicals and ozone were found to be divided into two regions during reaction. The Rct values during first period (1 min) were much greater than those during second period, and this was caused by initial rapid decrease of pCBA.

Keywords
Biogenic iron oxide; Magnetite; Ozonation; Catalytic reaction; pCBA
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Synthesis of nanosized biogenic magnetite and comparison of its catalytic activity in ozonation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 83, Issues 3–4, 23 September 2008, Pages 208–213
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