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In situ fabrication of Mn3O4 decorated graphene oxide as a synergistic catalyst for degradation of methylene blue

Paper ID Volume ID Publish Year Pages File Format Full-Text
45646 46418 2015 7 PDF Available
Title
In situ fabrication of Mn3O4 decorated graphene oxide as a synergistic catalyst for degradation of methylene blue
Abstract

•GO/Mn3O4 composites are successfully synthesized via a simple and green approach.•The method avoids fussy procedure for the separation process.•The atom-economic reaction produces only K2SO4 crystal as the by-product.•GO/Mn3O4 composite exhibits a high efficiency in catalytic oxidation of MB at room temperature.••OH specie has a positive relation with the catalytic activity for degradation of MB.

Herein we report a one-step approach to the highly efficient synthesis of graphene oxide/Mn3O4 (GO/Mn3O4) hybrids with superior catalytic activities for decomposition of methylene blue (MB) in water. This method exploits the pristine graphene oxide/manganese sulfate (GO/MnSO4) suspension produced by the modified Hummers method as the raw materials, in which GO/MnSO4 has been in situ converted into GO/Mn3O4 hybrid in combination with KOH and air. This atom-economic reaction produces only K2SO4 crystal as the by-product which meets the standard of green chemistry. For catalystic degradation of MB dye at room temperature, the as-prepared GO/Mn3O4 catalysts result in a significant enhancement in the reaction rate compared to that of the bare Mn3O4 particles with the assistance of H2O2. Typically, 50 mL of MB (50 mg L−1) can be 100% decolorized and 77% mineralized with 10 mg of the GO/Mn3O4 hybrid. Such excellent catalytic performance of the GO/Mn3O4 hybrid is mainly attributed to the synergistic effects of GO, Mn3O4, H2O2 and MB molecules. Based on the hydroxyl radical experiments, the catalytic activity of GO/Mn3O4 hybrids for degradation of MB is closely related with the amount of the reactive •OH species generated from H2O2.

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Keywords
Graphene oxide; Mn3O4; Methylene blue; Degradation; Green method
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In situ fabrication of Mn3O4 decorated graphene oxide as a synergistic catalyst for degradation of methylene blue
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 162, January 2015, Pages 268–274
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