期刊
CHEMOSPHERE
卷 203, 期 -, 页码 442-449出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.04.001
关键词
Iron-copper bimetallic catalyst; Fenton-like process; Synergistic effects; Cyclic voltammetry; Oxygen vacancy
资金
- National Nature Science Foundation of China [21677052]
- Major Science and Technology Program for the Industry-Academia-Research Collaborative Innovation [201704020206]
- Guangdong Water Conservancy Science and Technology Innovation Project [2017-25]
- Guangdong Province Science and Technology Project [2016B090918104, 2016B020240005, 2017A020216013]
- Joint fund of Guangdong Province [U1401235]
- State Key Laboratory of Pulp and Paper Engineering [2016C03]
- Zhanjiang of Guangdong Energy Co. [ZY-KJ-YX-2016X085F]
Iron-copper bimetal supported on mesoporous gamma-Al2O3 with different Fe/Cu ratios was prepared via a modified evaporation-induced self-assembly method and employed to degrade 4-chlorophenol (4-CP) in a Fenton-like process. The X-ray photoelectron spectroscopy, X-ray diffraction spectrum and UV-vis diffuse reflectance spectroscopy results confirmed the co-doping of Fe2+/Fe3+ and Cu+/Cu2+ into the lattice of gamma-Al2O3 through the bonds of Al-O-Fe and Al-O-Cu. With the iron and copper co-doped in gamma-Al2O3, three-fold oxygen vacancies (V-0) could be achieved compared with that of non-metal catalysts, which was favorable for the reduction of iron and copper species. The 1Fe3Cu-gamma-Al2O3 with a Fe/Cu mass ratio of 1:3 exhibited the highest activity on Fenton-like degradation of 4-CP due to the synergistic effects of Fe and Cu by facilitating the electron transfer in the recycles of Cu+/Cu2+ and Fe2+/Fe3+ based on the results of X-ray photoelectron spectroscopy, cyclic voltammetry and electro paramagnetic resonance analysis. The utilization efficiency of H2O2 was as high as 86.0% when 4-CP almost disappeared (i.e., 99.7 percent of 0.78 mM 4-CP) at 240 min and pH 7.0, additionally, their dechlorination and TOC removal efficiencies were 92.0% and 81.6%, respectively. The catalyst also displayed a good performance after 5th cycles. Furthermore, a possible mechanism for activation of center dot OH on the catalyst surface was also proposed. (C) 2018 Elsevier Ltd. All rights reserved.
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