Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 257, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.117873
Keywords
Silicate-based microfiltration membrane; Catalytic ozonation; Iopamidol; Hydroxyl radical; Degradation mechanism
Categories
Funding
- National Key R&D Program of China [2019YFD1100104, 2017YFA0207203, 2017YFA0207204]
- National Natural Science Foundation of China [51608362]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QA201941]
- Research Project of Tianjin Municipal Education Commission [2018KJ139]
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A novel flat microfiltration membrane was prepared by the compression method using cement and sucrose as a pore-forming agent for catalytic ozonation of iopamidol (IPM). The membrane structure contained various metal oxides and alkaline hydration products rich in hydroxyl groups. Hydroxyl radicals (center dot OH) were found to play a crucial role in the degradation process of IPM, which included amide hydrolysis, amino oxidation, and dehydrogenation.
A novel flat microfiltration membrane was prepared by the compression method with cement and sucrose as a pore-forming agent for catalytic ozonation of iopamidol (IPM). The microfiltration membrane was characterized by SEM, EDS, FT-IR, XRD and XPS spectra. The results showed that various metal oxides and alkaline hydration products which are rich in hydroxyl groups existed in the structure of the membrane. The degradation and mineralization of IPM were improved by the membrane catalyzed ozonation process than that of the sole ozonation process. The effects of the ozone concentration, solution pH, inorganic ions and natural organic matter (NOM) on the catalytic performance were investigated. The results indicated that hydroxyl radicals (center dot OH) played an important role during IPM degradation. The intermediate degradation products of IPM were detected by the UPLC-QTOF/MS, and the results showed that the degradation mechanism included amide hydrolysis, amino oxidation and dehydrogenation.
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