Preparation of N-doped porous carbon with high specific surface area and its adsorption performance for chlortetracycline
Coal pitch and melamine were taken as carbo source and nitrogen source,respectively,the nitrogen-doped porous carbon(MCCx)with high specific surface area was prepared by one-step pyrolysis method with MgO template coupled with KOH activation.The MCCx was characterized by BET、SEM、FTIR and XPS,and its adsorption capacity for chlortetracycline(CTC)was investigated.The results showed that when the mass ratio of coal bitumen to melamine was 0.5,the obtained MCC0.5 contained a large number of pores with accumulated fold laminates.The micropores specific surface area of MCC0.5 could reach 2 042 m2·g-1.The FTIR spectra of MCCx showed that the stretching vibration of the C=N of aromatic compounds appeared.XPS results showed that N element was successfully introduced in MCCx with the addition of melamine,and MCC0.5 had the highest pyridine N content.Langmuir adsorption isotherm model could well describe the adsorption process of CTC on MCC0.5,with the maximum theoretical adsorption capacity of 1 056 mg·g-1.
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