Synthesis of Ultrafine Platinum Nanocatalysts by Ice-photochemical Method and Their Application in Catalytic Degradation of 4-nitrophenol

Graphical Under visible light irradiation at low temperature, uniformly dispersed ultrafine platinum(Pt) nanocatalysts was loaded on fullerene (C 60 ) without adding any reducing agent or stabilizing agent, and was effectively used to catalyze the reduction of 4-nitrophenol. The results show that Pt nanoparticles with good catalytic activity can be finally formed under the action of visible light. This green visible light chemical synthesis method is expected to be popularized in the field of catalysis. Here, uniformly dispersed ultrafine platinum nanocatalysts (Pt/C 60 ) were synthesized on C 60 by ice-photochemical method using potassium chloroplatinate (K 2 [PtCl 4 ]) as platinum source under the condition of low temperature, no stabilizer and reducing agent. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and Transmission electron microscopy (TEM) were used to study the composition and morphology of Pt/C 60 catalyst. It was confirmed that Pt Ultra-small Particles (Pt UPs) was loaded on C 60 surface with high dispersion. The average particle sizes of the three samples obtained under different reaction conditions were 1.41±0.1 nm, 1.54±0.4 nm and 1.73±0.3 nm, respectively. The results show that the light-induced effect and the ice lattice domain limiting effect in the frozen state effectively control the formation and growth of platinum clusters in the process of Pt 2+ reduction to Pt 0 . The rate constants of the three samples were 0.89 min −1 , 0.31 min −1 , 0.19 min −1 , respectively, showing high catalytic activity in the study of the catalytic performance of Pt/C 60 degradation of 4-nitrophenol (4-NP) by Ultraviolet-visible spectroscopy (UV-Vis). This method provides a meaningful attempt for the study of green chemical synthesis method of platinum metal catalysts.