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Nb-doped hematite: Highly active catalyst for the oxidation of organic dyes in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
54444 47009 2015 6 PDF Available
Title
Nb-doped hematite: Highly active catalyst for the oxidation of organic dyes in water
Abstract

•Nb-doped hematite highly active was obtained by the generation of peroxo groups after activation with H2O2.•The mass spectrometry showed that oxidized intermediates were produced.•The niobium introduction into hematite structure decreases strongly the particle size of the material.

The use of iron oxides as materials for advanced oxidation processes has been widely reported, however the hematite phase has been poorly studied. Catalytic cycles show the importance of the redox states of the Fe2+/Fe3+, although hematite has only Fe3+. The introduction of dopant ion, such as 3% niobium in the hematite structure, is able to make it an effective material for treatment of polluted water. In our work it was possible to verify a removal of approximately 45% of a methylene blue (MB) solution (10 mg L−1) using Nb-doped hematite and 75% of the same MB solution using the oxide after a previous treatment with H2O2 to generate surface peroxo groups.

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Keywords
Iron oxide; Niobium; Peroxo group; Oxidation process
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Nb-doped hematite: Highly active catalyst for the oxidation of organic dyes in water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 240, Part A, 1 February 2015, Pages 176–181
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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