Abstract: This thesis focuses on the activation of persulfate to degrade 4-chlorophenol by self-developed nitrogen-doped carbon materials. Firstly, three nitrogen doped carbon materials (NCs) (NC-700, NC-800, and NC-900) were synthesized via sol-gel method by using waste industrial syrup as carbon source and ammonia as nitrogen source, which were characterized by the methods of scanning electron microscope(SEM), X-ray diffraction(XRD), Raman spectra(Raman), and X-ray photoelectron spectroscopy(XPS). Then, the effects of NC-800 dosage, persulfate (PDS) dosage,and initial pH on the removal rate of 4-chlorophenol were investigated, and electron spin resonance (ESR) and free radical quenching experiments were carried out. It showed that all the three NCs could effectively activate persulfate (PDS) to degrade 4-chlorophenol; and NC-800 showed the best ctivation performance; the removal efficiency of 50 mg/L 4-chlorophenol reached 99.10 % in 30 min, when the dosage of NC-800 and PDS were 100 mg/L and 5 mmol/L, respectively; the initial pH had no effects on the removal efficiency of 4-chlorophenol; NC-800 activated persulfate degradation of 4-chlorophenol,which followed the non-radical pathway, and the singlet oxygen was the active substance for degrading of 4-chlorophenol. The cycling experiments showed that NC-800 has certain stability, and the removal efficiency could still reach to 73.80 % after four cycles.

Key words: nitrogen doped carbon materials, 4-chlorophenol, persulfate, non-radical pathway, singlet oxyge