Ternary Graphene–TiO₂–Fe₃O₄ Nanocomposite as a Recollectable Photocatalyst with Enhanced Durability

We developed a ternary nanocomposite of graphene–TiO 2 –Fe 3 O 4 (GTF) as a low‐cost, recollectable, and stable photocatalyst for the degradation of organic dyes. The nanocomposite has been successfully prepared by successively growing TiO 2 and Fe 3 O 4 nanoparticles on the reduced graphene oxide (RGO). The as‐synthesized GTF nanocomposite shows higher photocatalytic activity as compared with that of pure TiO 2 nanoparticles and can be easily collected from water using a magnet. More importantly, benefiting from the presence of RGO, GTF can suppress the photodissolution behavior of Fe 3 O 4 nanoparticles that usually occurrs in TiO 2 –Fe 3 O 4 binary nanocomposites, rendering it a highly stable photocatalyst. Furthermore, the GTF nanocomposite works well in different pH environments and is capable of eliminating mixtures of various dyes. In addition, the GTF is also able to degrade the dyes under sunlight. These attractive features make the GTF nanocomposite a promising photocatalyst for practical use in wastewater treatment.