Key Words:Oxidation;Catalysis - Iron - Magnetism - Photocatalysis - Photocatalysts - Rate constants;Degradation of organic dyes - Fe3O4-TiO2 - Fenton process - Magnetic immobilization - Morphology and structures - Photo catalytic degradation - Photocatalytic activities - Photocatalytic property

Abstract:The magnetic Fe<inf>3</inf>O<inf>4</inf>loaded anatase TiO<inf>2</inf>photocatalysts with different mass ratios were successfully synthesized by a one-step convenient calcining method. The morphology and structure analysis revealed that Fe<inf>3</inf>O<inf>4</inf>was formed in TiO<inf>2</inf>with very fine-grained particles. After a small amount of Fe<inf>3</inf>O<inf>4</inf>loaded onto TiO<inf>2</inf>, the photocatalytic property enhanced obviously for the degradation of organic dye. Furthermore, the photo-Fenton-like catalysis of the iron-containing samples could also be induced after the addition of hydrogen peroxide. The apparent kinetic constant of the reaction that catalyzed by Fe-TiO<inf>2</inf>was about 5.3 and 8.3 times of that catalyzed by TiO<inf>2</inf>or Fe<inf>3</inf>O<inf>4</inf>only, respectively, proving an effective synergistic contribution of the photocatalysis and Fenton reaction in the composite. Compared with Fe<inf>3</inf>O<inf>4</inf>or free Fe³⁺ions, only 13% of iron in TiO<inf>2</inf>dissolved into acidic solution (25% for Fe<inf>3</inf>O<inf>4</inf>and 100% for Fe³⁺) after the reaction, which confirmed the iron had been well immobilized onto TiO<inf>2</inf>. In addition, the extremely stable photocatalytic activity in cycling experiments proved the immobilized iron had been tightly attached onto TiO<inf>2</inf>, indicating the great potential of the catalyst for practical applications.<br/> &copy; 2017 Elsevier B.V.

Volume:430

Translation or Not:no