Ba _x Co _{3− x} O

An iron-modified coconut shell biochar (FBC) support was prepared via iron salt impregnation, and the active Ba _x Co _{3− x} O ₄ component was loaded on its surface by coprecipitation and reduction to fabricate a high-activity peroxidase-like composite Ba _x Co _{3− x} O ₄ /FBC _0.2 -B.