Nano zero-valent iron (nZVI) and its composites utilized as persulfate (PS) activators has attracted extensive attention for the complete oxidative degradation of organic contaminants. However, the intrinsic agglomeration and the passivation layer on nZVI surface seriously impeded the electronic transmission performance, which significantly decreased the utilization efficiency of nZVI. Herein, sulfidated nano zero-valent iron/biochar (S-nZVI/BC) was prepared by the co-sulfuration method via liquid phase reduction approach to promote PS activation for p-chloroaniline (PCA) degradation. The PCA removal efficiency reached 96.43% after 10 min of reaction, and the reaction rate constant (k) and the reaction stoichiometric efficiency (RSE) were 0.337 min