The efficacy and mechanism of nitrogen/manganese co-doped biochar,which is prepared via high-temperature pyrolysis,together with persulfate for the synergistic degradation of acesulfame-K,an emerging pollutant,in water are investigated.Characterization results show that the nitrogen-manganese co-doped biochar has good specific surface area and pore size structure.It is shown by experimental results that the nitrogen-manganese co-doped biochar together with persulfate can significantly enhance the degradation rate of acesulfame-K in water.The removal rate of acesulfame-K reaches as high as 94.17％in 120 min under the conditions that the dosage of catalyst is 2.5 g·L-1,the concentration of persulfate is 8 mmol·L-1 and the pH of the initial solution remains unchanged.The degradation reaction is characterized by taking sulfate radicals as the dominant radicals.Nitrogen-manganese co-doped biochar has good activation performance and recycling rate.
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