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

作者：Wei Xiang; Mingjie Huang; Yifan Wang; Xiaohui Wu; Fugang Zhang; Dan Li; Tao Zhou^*

来源：Chinese Chemical Letters, 2020, 31(10): 2831-2834.

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 we re 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 we re 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(O) 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

• 单位
  华中科技大学