Ni@C/CN nanocatalysts for aromatic degradation nitro compounds and toxic organic dyes
Ni@C/CN nanocatalysts were designed and synthesized using the arc discharge method combined with the pyrolysis technique.Transmission electron microscopy(TEM),X-ray diffraction,XPS photoelectron spectroscopy,and electrochemical workstation were employed to investigate the microstructure and electron transport capacity of Ni@C/CN.Subsequently,the catalytic reduction properties of the prepared catalysts were evaluated against aromatic nitro compounds(p-nitrophenol(4-NP)and organic dyes(methylene blue(MB))using UV-visible spectrophotometer.The corresponding results showed that the Ni@C/CN nanocatalysts possessed better catalytic reduction properties than those of the Ni@C nanocapsules.The catalytic performance of Ni@C/CN could be regulated by optimizing the mass ratio of Ni@C nanocapsules and melamine,and its quasi-primary reaction rate constants(kapp)for the catalytic reduction degradation of 4-NP and MB were 4.656 min-1 and 13.879 min-1,respectively.It was revealed that the introduction of N and the heterogeneous C/CN shell layer coated with metallic Ni resulted in good core-shell synergy and improved the electron transport capacity of Ni@C/CN,while the surface defects of CN enhanced the adsorption properties of the catalyst and enhanced the catalytic reduction of Ni@C/CN.
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维普
