Heterogeneous Fenton-like discoloration of methyl orange using Fe3O4/MWCNTs as catalyst： kinetics and Fenton-like mechanism

The kinetics and Fenton-like mechanism are two challenging tasks for heterogeneous Fenton-like catalytic oxidation of organic pollutants. In this study, three kinetic models were used for the kinetic studies of Fe3O4/MWCNTs-H2O2 Fenton-like reaction for MO degradation. The results indicated that thi...

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Bibliographic Details
Published inFrontiers of materials science Vol. 12; no. 1; pp. 34 - 44
Main Authors Xu, Huan-Yan, Wang, Yuan, Shi, Tian-Nuo, Zhao, Hang, Tan, Qu, Zhao, Bo-Chao, He, Xiu-Lan, Qi, Shu-Yan
Format Journal Article
LanguageEnglish
Published Beijing Higher Education Press 01.03.2018
Springer Nature B.V
Subjects
Catalysis
Catalytic oxidation
Chemistry and Materials Science
Discoloration
Dissolution
Dyes
Fenton;动力学;异构;机制;催化剂;Arrhenius;橘子;褪色
Ferromagnetism
Hydrogen peroxide
Iron oxides
Kinetics
Materials Science
Nanocomposites
Oxidation
Pollutants
Radicals
Reaction kinetics
Recyclability
Research Article
NPs
OH radicals
Fenton-like mechanism
MWCNTs
kinetics
Fe
O
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Summary:The kinetics and Fenton-like mechanism are two challenging tasks for heterogeneous Fenton-like catalytic oxidation of organic pollutants. In this study, three kinetic models were used for the kinetic studies of Fe3O4/MWCNTs-H2O2 Fenton-like reaction for MO degradation. The results indicated that this reaction followed the first- order kinetic model. The relationship of reaction rate constant and temperature followed the Arrhenius equation. The activation energy and frequency factor of this system were calculated as 8.2 kJ.mo1-1 and 2.72 s-1, respectively. The quantifications of Fe ions dissolution and ,OH radicals generation confirmed that the homogeneous and hetero- geneous catalyses were involved in Fe3O4/MWCNTs＇H2O2 Fenton-like reaction. The reaction rate constant was closely related with Fe ions dissolution and ,OH radicals generation. Fe3O4/MWCNTs nanocomposites had typical ferromagnetic property and could be easily separated from solution by an external magnet after being used. Furthermore, Fe3O4/MWCNTs nanocomposites exhibited good stability and recyclability. Finally, the Fenton-like mechanisms on homogeneous and heterogeneous catalyses were described.
Bibliography:MWCNTs; Fe3O4 NPs; kinetics; ,OH radicals; Fenton＇like mechanism
The kinetics and Fenton-like mechanism are two challenging tasks for heterogeneous Fenton-like catalytic oxidation of organic pollutants. In this study, three kinetic models were used for the kinetic studies of Fe3O4/MWCNTs-H2O2 Fenton-like reaction for MO degradation. The results indicated that this reaction followed the first- order kinetic model. The relationship of reaction rate constant and temperature followed the Arrhenius equation. The activation energy and frequency factor of this system were calculated as 8.2 kJ.mo1-1 and 2.72 s-1, respectively. The quantifications of Fe ions dissolution and ,OH radicals generation confirmed that the homogeneous and hetero- geneous catalyses were involved in Fe3O4/MWCNTs＇H2O2 Fenton-like reaction. The reaction rate constant was closely related with Fe ions dissolution and ,OH radicals generation. Fe3O4/MWCNTs nanocomposites had typical ferromagnetic property and could be easily separated from solution by an external magnet after being used. Furthermore, Fe3O4/MWCNTs nanocomposites exhibited good stability and recyclability. Finally, the Fenton-like mechanisms on homogeneous and heterogeneous catalyses were described.
11-5985/TB
ISSN:2095-025X
2095-0268
DOI:10.1007/s11706-018-0412-5