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As two effective approaches to increase the visible light-absorption capacities of photocatalysts, ion doping and metallic nanoparticles loading are compared in this work. Palladium was selected to modify Bi 2 O 2 CO 3 . Compared to dispersing palladium nanoparticles on the photocatalyst surface, it was more effective for the method of doping with palladium to shift the energy level within the bandgap of Bi 2 O 2 CO 3  in improving its photocatalytic activity under visible light. This might be because doping with Pd 2+  narrows the band gap of Bi 2 O 2 CO 3  so as to increase the absorption capacity of visible light photons. Pd nanoparticles on the other hand can absorb photons to produce electrons which are then utilized by Bi 2 O 2 CO 3  for photocatalytic reactions. Different mechanisms resulted in significant differences, and this work provides solid evidence that ion doping may be a more effective method to improve the photocatalytic activity of Bi 2 O 2 CO 3 .

journal of nanomaterials

A Comparison of Pd0 Nanoparticles and Pd2+ Modified Bi2O2CO3 for Visible Light-Driven Photocatalysis