Bimetallic Fe/Ti‐Based Metal–Organic Framework for Persulfate‐Assisted Visible Light Photocatalytic Degradation of Orange II

Abstract

Abstract Amine‐functionalized bimetallic Fe/Ti‐based metal–organic frameworks (Fe/Ti‐MOF‐NH 2 ) were synthesized via the solvothermal method and used as photocatalysts and activators for persulfate (PS)‐assisted visible light photocatalytic degradation of Orange II. Nearly 100% of Orange II was removed within 10 min in the Fe/Ti‐MOF‐NH 2 (3:1)/PS/Vis process, while only 10.7% and 70.9% of Orange II were removed in Fe/Ti‐MOF‐NH 2 (3:1)/Vis and Fe/Ti‐MOF‐NH 2 (3:1)/PS processes within 10 min, respectively. Therefore, the synergistic effect of PS activation and visible light photocatalysis was demonstrated by the Fe/Ti‐MOF‐NH 2 (3:1) composite. The enhanced photocatalytic activity of the photocatalyst can be attributed to the efficient electrons transfer by Fe 3+ /Fe 2+ and Ti 4+ /Ti 3+ redox cycles, activation of PS by photogenerated electrons to produce sulfate radicals (SO 4 •− ), and increased formation of hydroxyl radicals ( • OH). Concurrently, the Fe/Ti‐MOF‐NH 2 (3:1) photocatalyst also exhibited good reusability and stability in the photocatalytic reaction system.