Facile synthesis of Pt clusters decorated TiO₂ nanoparticles for efficient photocatalytic degradation of antibiotics

Abstract

Abstract TiO 2 has attracted much attention in the field of photocatalytic degradation of antibiotics due to its good photostability, nontoxicity, and low cost. However, the rapid recombination of photogenerated carriers limits the further improvement of its photocatalytic activity. Here, a facile microwave‐assisted hydrothermal method has been developed to prepare Pt clusters decorated TiO 2 nanoparticles. Pt clusters ranging in size from 1 to 2 nm are uniformly distributed across the surface of the TiO 2 matrix. A pronounced charge transfer phenomenon is discernible between the Pt and TiO 2 components. It is revealed that the charge transfer enables faster transfer and separation of photogenerated electrons and holes, which are beneficial for the improvement of photocatalytic degradation of both ofloxacin and levofloxacin. The degradation capability can be attributed to the efficient generation of •OH or •O 2 − species within the solution. The parallel adsorption model of TiO 2 on antibiotic molecules is verified, and the degradation reaction pathway has been elucidated. This work provides a facile method for optimizing the performance of TiO 2 photocatalysts, which can be extended to other oxide photocatalysts.