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- Title
Fe-encapsulated zeolite composite with free OH group as Fenton-like catalyst in near-neutral solution.
- Authors
Lei Wang; Chen Chen; Ting Cheng; Bo Ma; Run Zhou; Dianyi Wu; Xiao Zhang; Yuan Tian
- Abstract
A novel nano-scale zeolite encapsulated with iron ions (zeolite@Fe) was prepared, and used as a heterogeneous Fenton-like catalyst to participate in zeolite@Fe/H2O2 reaction. The zeolite@Fe material was characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy-energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy, and the findings proved that zeolite@Fe was successfully achieved, and Fe3+ rich nano spherical-like shape material was formed on the surface of zeolite. The methylene blue (MB) was used to verify the catalytic activity of zeolite@Fe in Fenton-like reaction, and the reaction mechanisms were illustrated by spin-polarized density-functional theory computation. The experimental results stated that the addition of zeolite@Fe and H2O2 remarkable improved the degradation of MB. In addition, this Fenton-like reaction system could be achieved at a relatively wide and mild pH range. The temperature had a significant effect on zeolite@Fe/H2O2 reaction, and the reaction process could be better described by the first-order reaction kinetics model. Also, zeolite@Fe was stable in Fenton-like reaction after four times of reusing. Moreover, the findings of theoretical structure model and charge density distribution for zeolite@Fe suggested that •OH radicals forming by a large amount of free OH groups were the predominant reactive species responsible for MB degradation. Furthermore, after the complex interaction between H2O2 molecules and Fe elements, Fe active sites on the surface of zeolite@Fe were able to tear H2O2 molecules apart, forming a free OH group and H group while capturing one O element.
- Subjects
FREE groups; CATALYTIC cracking; ZEOLITES; X-ray photoelectron spectroscopy; METHYLENE blue; HETEROGENEOUS catalysts
- Publication
Desalination & Water Treatment, 2022, Vol 254, p116
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28362