Heterogeneous Fenton-like discoloration of methyl orange using Fe3O4/MWCNTs as catalyst： kinetics and Fenton-like mechanism
Heterogeneous Fenton-like discoloration of methyl orange using Fe3O4/MWCNTs as catalyst： kinetics and Fenton-like mechanism作者机构：School of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China
出 版 物：《Frontiers of Materials Science》 (材料学前沿（英文版）)
年 卷 期：2018年第12卷第1期
页 面：34-44页
核心收录：
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080101[工学-一般力学与力学基础] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）]
基 金：This work was financially supported by the Natural Science Foundation of Heilongjiang Province China (Grant No. E2015065)
主 题：MWCNTs Fe3O4 NPs kinetics ,OH radicals Fenton'like mechanism
摘 要：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 ***1-1 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.
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