Nonmetallic doped biochar showed great potential for activating persulfates, gaining considerable attention in environmental remediation. However, its activating mechanism and phytotoxicity remain unclear. Herein, a novel B-doped biochar (BBC) was synthesized using waste tea residue and boric acid to activate ammonium persulfate (APS) for efficient degrade quinclorac (QC) in irrigation water . BBC exhibited remarkable catalytic performance for APS, achieving a QC removal efficiency of 91 % within 30 min under optimal conditions (0.5 g·L −1...