TY - JOUR
T1 - Fenton-like catalytic degradation of tetracycline by magnetic palygorskite nanoparticles prepared from steel pickling waste liquor
AU - Lian, Jintao
AU - Ouyang, Qiong
AU - Tsang, Pokeung Eric
AU - Fang, Zhanqiang
PY - 2019
Y1 - 2019
N2 - 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 N[sbnd]C bond in the TC molecule.
AB - 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 N[sbnd]C bond in the TC molecule.
KW - Fenton-like
KW - Iron-based material
KW - Magnetic palygorskite nanoparticles
KW - Steel pickling waste liquor
KW - Tetracycline
U2 - 10.1016/j.clay.2019.105273
DO - 10.1016/j.clay.2019.105273
M3 - Journal article
AN - SCOPUS:85071322164
VL - 182
JO - Applied Clay Science
JF - Applied Clay Science
SN - 0169-1317
M1 - 105273
ER -