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Fenton-like catalytic degradation of tetracycline by magnetic palygorskite nanoparticles prepared from steel pickling waste liquor
Abstract Magnetic palygorskite nanoparticles (Pal@Fe3O4) were prepared from steel pickling waste liquor and used for Fenton-like catalytic degradation of tetracycline(TC). The results showed that TC can be efficiently removed in a wide pH range of 3–7. The degradation efficiency reached 72.9% within 60 min under neutral conditions. Moreover, since the amount of leached iron ions was <0.03 mg/L after each reaction, the catalytic effectiveness of Pal@Fe3O4 hardly changed after five cycles. The microstructure of Pal@Fe3O4 was investigated by SEM, TEM and STEM-EDS mapping, which showed that the Fe3O4 spherical nanoparticles were supported on the surface of the rod-shaped Pal. Moreover, the saturation magnetization of Pal@Fe3O4 was 44.11 emu/g, indicating that the catalyst could be easily separated by magnetic separation technology. Both hydroxyl radicals (•OH) and superoxide radicals (•O2 −) were proven by electron spin resonance spectroscopy to be the dominant active species responsible for TC degradation. Four degradation products were identified by LC-MS/MS, mainly produced by the attack of the active radicals on the NC bond in the TC molecule.
Graphical abstract Display Omitted
Highlights Steel pickling waste liquor was first used to synthesize magnetic palygorskite. •OH and •O2 – were identified as the main active radicals for TC degradation. lucidation the potential degradation pathway of TC.
Fenton-like catalytic degradation of tetracycline by magnetic palygorskite nanoparticles prepared from steel pickling waste liquor
Abstract Magnetic palygorskite nanoparticles (Pal@Fe3O4) were prepared from steel pickling waste liquor and used for Fenton-like catalytic degradation of tetracycline(TC). The results showed that TC can be efficiently removed in a wide pH range of 3–7. The degradation efficiency reached 72.9% within 60 min under neutral conditions. Moreover, since the amount of leached iron ions was <0.03 mg/L after each reaction, the catalytic effectiveness of Pal@Fe3O4 hardly changed after five cycles. The microstructure of Pal@Fe3O4 was investigated by SEM, TEM and STEM-EDS mapping, which showed that the Fe3O4 spherical nanoparticles were supported on the surface of the rod-shaped Pal. Moreover, the saturation magnetization of Pal@Fe3O4 was 44.11 emu/g, indicating that the catalyst could be easily separated by magnetic separation technology. Both hydroxyl radicals (•OH) and superoxide radicals (•O2 −) were proven by electron spin resonance spectroscopy to be the dominant active species responsible for TC degradation. Four degradation products were identified by LC-MS/MS, mainly produced by the attack of the active radicals on the NC bond in the TC molecule.
Graphical abstract Display Omitted
Highlights Steel pickling waste liquor was first used to synthesize magnetic palygorskite. •OH and •O2 – were identified as the main active radicals for TC degradation. lucidation the potential degradation pathway of TC.
Fenton-like catalytic degradation of tetracycline by magnetic palygorskite nanoparticles prepared from steel pickling waste liquor
Lian, Jintao (author) / Ouyang, Qiong (author) / Tsang, Pokeung Eric (author) / Fang, Zhanqiang (author)
Applied Clay Science ; 182
2019-08-20
Article (Journal)
Electronic Resource
English
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