▎ 摘　　要

NOVELTY - Biosynthesis of magnetic graphene composite material, involves preparing magnetic graphene composite material culture solution comprising piperazine-1,4-di-ethylene sulfonic acid and sodium lactate to obtain magnetic graphene composite material culture solution; adding graphene oxide to magnetic graphene composite material culture solution, then adding beta-FeOOH, performing anaerobic magnetic stirring, to obtain mixed solution of graphene oxide and beta-FeOOH; collecting differentiation metal reducing bacteria and adding into the mixed solution, and cultivating to obtain the product. USE - For biosynthesis of magnetic graphene composite material (claimed) which is used in catalysis as an adsorbent material and magnetic materials. ADVANTAGE - The process requires mild reaction conditions; provides low energy consumption and simple operation; and can be recycled. The magnetic graphene composite material has good prospects in catalysis as an adsorbent material and magnetic materials. DETAILED DESCRIPTION - Biosynthesis of magnetic graphene composite material, involves (i) using graphene oxide as magnetic graphene composite material magnetic component synthesis of precursor material; (ii) using akaganeite (beta-FeOOH) as magnetic graphene composite material magnetic component synthesis of precursor material; (iii) using differentiation metal reducing bacteria in the manufacture of magnetic graphene composite material microbial species; (iv) preparing a magnetic graphene composite material culture solution comprising 10-30 mmol/liter piperazine-1,4-di-ethylene sulfonic acid and 10-30 mmol/liter sodium lactate, adjusting pH value at 7, to remove oxygen, and sterilizing to obtain magnetic graphene composite material culture solution; (v) adding 0.4-0.6 g/liter graphene oxide of step (i) to the magnetic graphene composite material culture solution, ultrasonic for 30-80 minutes, then adding 30-80 mmol/liter beta-FeOOH, performing anaerobic magnetic stirring for 12-36 hours, to obtain a mixed solution of graphene oxide and beta-FeOOH; (vi) collecting differentiation metal reducing bacteria at the end of the exponential growth phase; (vii) adding differentiation metal reducing bacteria obtained in step (vi) into the mixed solution of graphene oxide and beta-FeOOH obtained in step (v), then anaerobic at 30 degrees C under the condition of cultivation for 132-156 hours, to obtain magnetic graphene composite material.