Degradation of sulfamethazine using Fe 3 O 4 -Mn 3 O 4 /reduced graphene oxide hybrid as Fenton-like catalyst.

In this paper, Fe3 O4 -Mn3 O4 /reduced graphene oxide (RGO) hybrid was synthesized through polyol process and impregnation method and used as heterogeneous Fenton-like catalyst for degradation of sulfamethazine (SMT) in aqueous solution. The hybrid catalyst had higher catalytic efficiency compared with Fe3 O4 -Mn3 O4 and Mn3 O4 as catalyst for degradation of SMT. The effects of pH value, H2 O2 concentration, catalyst dosage, initial SMT concentration and temperature on SMT degradation were investigated. The removal efficiency of SMT was about 98% at following optimal conditions: pH=3, T=35°C, Fe3 O4 /Mn3 O4 -RGO composites=0.5g/L, H2 O2 =6mM. The inhibitor experiments indicated that the main active species was hydroxyl radicals (·OH) on catalyst surface. At last, the possible catalytic mechanism was proposed.