《Tab.3 Content of different N species in Co@NPC》

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《氮掺杂多孔碳包覆钴金属催化去除有机污染物（英文）》

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As reported in previous work，the graphitic N may greatly influence the catalytic activity of N doped carbon in PMS activation[21].To check the possible influence of graphitic N，the XPS spectra were performed to investigate the N species of [email protected] four peaks corresponding to graphitic-N（401.1eV），pyridinic-N（398.5eV），pyrrolic-N（400.5 eV）and Co-N coordination site（Co-Nx）（399.2 eV） [23]respectively are present in each [email protected] content of N species in different Co@NPC was summarized in Tab.3，which was calculated from the total N content and their respective proportion.Tab.3shows that the Co@NPC-750possesses higher graphitic N content than that of Co@NPC-950，but its catalytic activity is poorer.The results demonstrate the graphitic N is not the critical factor for PMS activation.In addition，the occurrence of Co-Nxsuggests the Co core could produce the influence on the carbon shell，whereas with the increase of carbonization temperature，the Co-Nxcontent decreases gradually，suggesting the thicker carbon shell restricts the interaction between Co and carbon.