Degradation of organic pollutants by Fe/N co-doped biochar via peroxymonosulfate activation: Synthesis, performance, mechanism and its potential for practical application

•Fe-N-C was prepared and utilized to activate PMS to degrade organic pollutants.•Fe-N-C showed 37.07 and 6.04-fold higher activity to biochar and N-biochar.•Synergistic effects between Fe and N species facilitated the production of ROS.•SO4•−, •OH and 1O2 were identified under the Fe-N-C/PMS treatment.•Fe-N-C showed great separation performance and reusability.