Oxygen Vacancy Promoted Heterogeneous Fenton-like Degradation of Ofloxacin at pH 3.2-9.0 by Cu Substituted Magnetic Fe3O4@FeOOH Nanocomposite.
Hang JinXike TianYulun NieZhaoxin ZhouChao YangYong LiLiqiang LuPublished in: Environmental science & technology (2017)
To develop an ultraefficient and reusable heterogeneous Fenton-like catalyst at a wide working pH range is a great challenge for its application in practical water treatment. We report an oxygen vacancy promoted heterogeneous Fenton-like reaction mechanism and an unprecedented ofloxacin (OFX) degradation efficiency of Cu doped Fe3O4@FeOOH magnetic nanocomposite. Without the aid of external energy, OFX was always completely removed within 30 min at pH 3.2-9.0. Compared with Fe3O4@FeOOH, the pseudo-first-order reaction constant was enhanced by 10 times due to Cu substitution (9.04/h vs 0.94/h). Based on the X-ray photoelectron spectroscopy (XPS), Raman analysis, and the investigation of H2O2 decomposition, •OH generation, pH effect on OFX removal and H2O2 utilization efficiency, the new formed oxygen vacancy from in situ Fe substitution by Cu rather than promoted Fe3+/Fe2+ cycle was responsible for the ultraefficiency of Cu doped Fe3O4@FeOOH at neutral and even alkaline pHs. Moreover, the catalyst had an excellent long-term stability and could be easily recovered by magnetic separation, which would not cause secondary pollution to treated water.
Keyphrases
- metal organic framework
- visible light
- aqueous solution
- quantum dots
- hydrogen peroxide
- highly efficient
- reduced graphene oxide
- molecularly imprinted
- wastewater treatment
- high resolution
- risk assessment
- mass spectrometry
- solid phase extraction
- computed tomography
- particulate matter
- gold nanoparticles
- room temperature
- liquid chromatography
- carbon dioxide
- water quality
- air pollution
- combination therapy
- electron microscopy
- carbon nanotubes
- tandem mass spectrometry