Abstract
Porous polyoxometalate–tantalum pentoxide (POM/Ta 2O 5, POM = H 3PW 12O 40 and H 6P 2W 18O 62) nanocomposites with different Keggin or Dawson unit loading levels (5.6–15.3%) were successfully prepared via hydrolysis of TaCl 5 in the presence of POM without the addition of any structure-directing reagent. Several characterization techniques, inductively coupled plasma atomic emission spectroscopy (ICP-AES), UV–vis diffuse reflectance spectroscopy (UV–vis/DRS), Fourier transform infrared (FT-IR), 31P magic-angle spinning (MAS) NMR, field emission scanning electron microscopy (FESEM), and nitrogen adsorption/desorption analysis were combined to confirm the structure integrity of the Keggen or Dawson unit in as-prepared composites and to investigate the optical absorption properties, morphology, and surface textural properties of the composites. The enhanced photocatalytic activity of the composites compared with that of solitary POM units or Ta 2O 5 was evaluated through decomposition of salicylic acid (SA) and rhodamine B (RB) under visible-light excitation. The large BET surface area (129.7–188.8 m 2 g −1) and porous structure, small particle size (20–25 nm), homogeneous dispersion of the POM unit within Ta 2O 5 framework, decreased bandgap energy, and strong electron acceptance ability of POM can explain this high photocatalytic activity of the composites.
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