Relationship between the structure of Fe-MCM-48 and its activity in catalytic ozonation for diclofenac mineralization.

作者: Xukai Li , Weirui Chen , Yiming Tang , Laisheng Li , None

DOI: 10.1016/J.CHEMOSPHERE.2018.05.066

关键词: RadicalDecompositionX-ray photoelectron spectroscopyHydrothermal circulationCatalysisOzoneNuclear chemistryMineralization (soil science)ChemistryMesoporous material

摘要: Abstract Fe-MCM-48 catalyst with a three-dimensional cubic pore structure was directly synthesized via hydrothermal method, and the mineralization efficiency of diclofenac (DCF) in catalytic ozonation process (Fe-MCM-48/O3) assessed. X-ray diffraction (XRD), N2 adsorption desorption, transmission electron microscopy (TEM) photoelectron spectroscopy (XPS) characterizations revealed that Fe existed framework MCM-48, possessed large surface area highly ordered mesoporous structure, which could accelerate reactants products diffusion. Regarding efficiency, addition significantly improved total organic carbon (TOC) removal, approximately 49.9% TOC were removed through Fe-MCM-48/O3 at 60 min, 2.0 times higher than single ozonation. Due to this catalyst's superior showed better activity compared Fe-MCM-41 loaded MCM-48 (Fe/MCM-48, on MCM-48). DCF removal primarily based ozone direct oxidation. The improvement attributed function generated hydroxyl radicals (•OH), indicated presence accelerated decomposition. Moreover, negatively charged proper pH value solution played an essential role OH generation.

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