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Preparation and characterization of TiO2-masked Fe3O4 nano particles for enhancing catalytic combustion of 1,2-dichlorobenzene and incineration of polymer wastes

Paper ID Volume ID Publish Year Pages File Format Full-Text
47729 46481 2009 7 PDF Available
Title
Preparation and characterization of TiO2-masked Fe3O4 nano particles for enhancing catalytic combustion of 1,2-dichlorobenzene and incineration of polymer wastes
Abstract

Nano-sized Fe3O4 particles that were covered with a porous layer of nano-sized TiO2 (TiO2-masked Fe3O4) were prepared by simply controlling pH of aqueous slurry solution containing the two particles that have different values of isoelectric point (IEP coating method). The prepared sample showed an effective masking of red-brown color of Fe3O4 particles into a pale yellow. XPS and TEM measurements confirmed an effective covering of TiO2 particles to the Fe3O4 surface. XANES analyses revealed the transformation of some Fe2+ ions into Fe3+ in the Fe3O4 structure (formation of Fe3O4+δ) due to a close interaction between Fe3O4 and TiO2 during the IEP coating, which was not observed in physical mixture of dry powders of Fe3O4 and TiO2. Compared with pure Fe3O4 or the physical mixture, TiO2-masked Fe3O4 particles exhibited an activity enhancement for both catalytic oxidation of 1,2-dichloro benzene and thermal incineration of catalyst-embedded polyethylene and polystyrene. Temperature-programmed reduction of CO and temperature-programmed surface reaction of CO with O2 revealed that oxygen vacancy sites on Fe3O4+δ played roles for the adsorption and reaction of CO, and close TiO2 provided oxygen to the Fe3O4+δ sites. Compared with pure Fe3O4 particles, TiO2-masked Fe3O4 particles also provided a good color-masking effect when embedded in polymers and improved the thermal stability of base polymers for high temperature fabrication.

Keywords
TiO2-masked iron oxides; Isoelectric point; 1,2-dichlorobenzene oxidation; Catalyst-embedded polymer; Polymer incineration
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Preparation and characterization of TiO2-masked Fe3O4 nano particles for enhancing catalytic combustion of 1,2-dichlorobenzene and incineration of polymer wastes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 91, Issues 1–2, 7 September 2009, Pages 210–216
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