Citation: Xiang Wei, Huang Mingjie, Wang Yifan, Wu Xiaohui, Zhang Fugang, Li Dan, Zhou Tao. New insight in the O₂ activation by nano Fe/Cu bimetals: The synergistic role of Cu(0) and Fe(Ⅱ)[J]. Chinese Chemical Letters, ;2020, 31(10): 2831-2834. doi: 10.1016/j.cclet.2020.08.006 shu

New insight in the O₂ activation by nano Fe/Cu bimetals: The synergistic role of Cu(0) and Fe(Ⅱ)

Xiang Wei ^a,b,1 ,
Huang Mingjie ^a,1 ,
Wang Yifan ^a,b ,
Wu Xiaohui ^a,b ,
Zhang Fugang ^c ,
Li Dan ^c ,
Zhou Tao ^a,*,

a.
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
b.
Key Laboratory of Water and Wastewater Treatment(HUST), MOHURD, Wuhan 430074, China
c.
Three Gorges Base Development Co. Ltd, Yichang 443002, China

zhoutao@hust.edu.cn

Received Date: 15 June 2020
Revised Date: 10 July 2020
Accepted Date: 5 August 2020
Available Online: 7 August 2020

Figures(4)

This study demonstrated that as-synthesized nano Fe/Cu bimetals could achieve significant enhancement in the degradation of diclofenac (DCF), as compared to much slow removal of DCF by Cu(Ⅱ) or zero valent iron nanoparticles (nZVI), respectively. Further observations on the evolution of O₂ activation process by nano Fe/Cu bimetals was conducted stretching to the preparation phase (started by nZVI/Cu²⁺). Interesting breakpoints were observed with obvious sudden increase in the DCF degradation efficiency and decrease in solution pH, as the original nZVI just consumed up to Fe(Ⅱ) and Cu(Ⅱ) appeared again. It suggested that the four-electrons reaction of O₂ and Cu-deposited nZVI would occur to generate water prior to the breakpoints, while Cu(0) and Fe(Ⅱ) would play most important role in activation of O₂ afterwards. Through the electron spin resonance (ESR) analysis and quenching experiments, ^·OH was identified as the responsible reactive species. Further time-dependent quantifications in the cases of Cu(0)/Fe(Ⅱ) systems were carried out. It was found that the ^·OH accumulation was positively and linearly correlated with nCu dose, Fe(Ⅱ) consumption, and Fe(Ⅱ) dose, respectively. Since either Cu(0) or Fe(Ⅱ) would be inefficient in activating oxygen to produce ^·OH, a stage-evolution mechanism of O₂ activated by nano Fe/Cu bimetals was proposed involving: (a) Rapid consumption of Fe(0) and release of Fe(Ⅱ) based on the Cu-Fe galvanic corrosion, (b) adsorption and transformation of O₂ to O₂^2- at the nCu surface, and (c) Fe(Ⅱ)-catalyzed activation of the adsorbed O₂^2- to ^·OH.
- Advanced oxidation,
- Nano Fe/Cu bimetals,
- Oxygen activation,
- Hydroxyl radical,
- Heterogeneous catalysis
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通讯作者: 陈斌, bchen63@163.com

New insight in the O₂ activation by nano Fe/Cu bimetals: The synergistic role of Cu(0) and Fe(Ⅱ)