Details

Autor(en) / Beteiligte

• Xu, Huan-Yan
• Wang, Yuan
• Shi, Tian-Nuo
• Zhao, Hang
• Tan, Qu
• Zhao, Bo-Chao
• He, Xiu-Lan
• Qi, Shu-Yan

Titel

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

Ist Teil von

• Frontiers of materials science, 2018-03, Vol.12 (1), p.34-44

Ort / Verlag

Beijing: Higher Education Press

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.