The preparation, characterization of FeC micro‐electrolysis materials using low‐cost biochar and the removal of ultra‐high COD pesticide wastewater

Abstract Two kinds of FeC micro‐electrolysis materials (FeC MEMs) named Fe 0 /FeC MEMs and Fe 3 O 4 /FeC MEMs were prepared using low‐cost biochar, chemical grade Fe 0 powder and industrial iron powder. The FeC MEMs were characterized by XRD, SEM and FT‐IR. Meanwhile, the effects of sintering temperatures and mass ratios of Fe to C on the treatment high chemical oxygen demand (COD) pesticide wastewater were studied. The results display that the relative removal rate of COD reached 64% for Fe 0 /FeC MEMs when the sintering temperature was 400°C and the mass ratio of Fe to C was 1 : 1. For Fe 3 O 4 /FeC MEMs, and the mass ratio of Fe 3 O 4 to C was 1 : 3, the relative removal rate of COD reached 63.71%. Hence, the chemical grade Fe 0 powder could be replaced with industrial iron powder to achieve the goal of low‐cost treatment of the high COD pesticide wastewater.