Catalytic ozonation of phenol by magnetic Mn0.7Ce0.3Ox/CNT@Fe3C

Abstract

A high-efficient and stable catalyst is highly desired to catalyze ozone for refractory organic pollutants removal. In this work, Mn-Ce bimetallic oxide loaded CNT@Fe _3 C (Mn _0.7 Ce _0.3 O _x /CNT@Fe _3 C) was synthesized with Mn _0.7 Ce _0.3 O _x as the active component and magnetic CNT@Fe _3 C as the support. The catalytic performance of Mn _0.7 Ce _0.3 O _x /CNT@Fe _3 C towards catalytic ozonation was evaluated. The TOC removal efficiency of phenol degradation after 45 min of reaction was 98%, which was 1.5 times and 1.8 times that of monometallic CeO _2 /CNT@Fe _3 C (65%) and Mn _x O _y /CNT@Fe _3 C (54%), respectively. The synthesized-Mn _0.7 Ce _0.3 O _x /CNT@Fe _3 C possessed good reusability during five successive cycles and remained efficient over a wide range of pH 4.2–8.3. The results of EPR measurements and quenching experiments demonstrated that hydroxyl radicals (·OH) were the dominant reactive oxidation species (ROS) for phenol mineralization in the Mn _0.7 Ce _0.3 O _x /CNT@Fe _3 C/O _3 system. Moreover, the magnetic Mn _0.7 Ce _0.3 O _x /CNT@Fe _3 C is easily recovered and reused.

Keywords

• catalytic ozonation
• Mn-Ce bimetallic oxide
• magnetic
• phenol
• mineralization