期刊
ENVIRONMENTAL RESEARCH
卷 204, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2021.111986
关键词
ZIF-67; VTM composite; Core-shell structure; Levofloxacin; Peroxymonosulfate
资金
- Natural Sci-ences Foundation of China [52000163]
- Key Project of Natural Science Foundation of China-Xinjiang Joint Fund [U1803241]
- Natural Sciences Foundation of China [51779230]
- Natural Science Foundation of Henan Province [202300410423]
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology [CJSZ2021001]
- Technology Think Tank Project [HNKJZK-2021-05C]
A core-heteroshell structural magnetic composite of ZIF-67/Vanadium-titanium magnetite (VTM) was successfully synthesized and used for the activation of peroxymonosulfate (PMS) in the treatment of levofloxacin (LVF) in water. The catalytic activity of the ZIF-67/VTM composite in LVF degradation was evaluated, showing high efficiency in promoting the breakage of the O-O bond in PMS and the redox cycle of cobalt.
A core-heteroshell structural magnetic composite of ZIF-67/Vanadium-titanium magnetite (VTM) was successfully synthesized through a feasible solvothermal method and efficiently used in activation of peroxymonosulfate (PMS) for the treatment of levofloxacin (LVF) in an aqueous solution. The catalytic activity of the ZIF-67/VTM composite in LVF degradation was thoroughly evaluated, demonstrating the LVF removal rate could reach up to 93.3% within 60 min at ZIF-67/VTM composite dosage of 100 mg/L, PMS concertation of 75 mg/L, and the natural pH of 6.4. It is quite interesting that the carbon organic skeleton (in the ZIF-67 shell) have accelerated the internal electron transformation rate of the ZIF-67/VTM composite, thus efficiently promoting the O-O band (in PMS) breakage and the redox cycle of cobalt, further favoring the free radicals generation. The quenching experiments and EPR analysis results demonstrated that center dot SO4- would play a crucial role in the LVF degradation process. Surprisingly, we have found that the introduction of Cl- (at some certain dosage) would not always decrease the LVF degradation ratio, for a new reactive oxygen species (singlet oxygen) was emerged in this system. What's more, the ZIF-67 (as the wrapping structure) could stabilize the VTM (the inner structure) in changing reaction conditions, prompting a good adaptability at a wider pH range (3-10) for inhibiting the leaching of various metal ions into the aqueous solution. This novel ZIF-67/VTM composite could provide new ideas and routes for the removal of emerging pollutants from an aqueous solution.
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