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Highlights: [•] Mesoporous Co3O4 and nano-Co3O4 were prepared by the hard template method and precipitation method. [•] 3D-Co3O4 has the clear special pore structure, large surface area and surface active species. [•] 3D-Co3O4 shows the best catalytic activity due to abundant surface oxygen species and active Co3+ species. [•] 3D-Co3O4 has excellent reaction stability after continuously reacting for 160h. [ABSTRACT FROM AUTHOR]

Three-dimensionally ordered macroporous (3DOM) photocatalysts BiVO 4 (denoted as 3D-BiV), AgBr/3D-BiV, and 0.17 wt% M/AgBr/3D-BiV (M Au, Pt, and Pd) were prepared using the polymethyl methacrylate-templating, low-temperature deposition, and polyvinyl alcohol-protected reduction methods, respectively. The as-prepared BiVO 4 possessed a good-quality 3DOM structure and a high surface area. It is found that the AgBr and noble metals were uniformly distributed on the surface of 3D-BiV. Among the M/AgBr/3D-BiV samples, the 0.17 wt% Pd/AgBr/3D-BiV sample showed the highest photocatalytic activity for the degradation of 4-chlorophenol (4-CP) under visible light illumination (i.e., complete 4-CP degradation could be achieved within 150 min), which was associated with its good 3DOM structure, high surface oxygen adspecies concentration, easy transfer and separation of photogenerated carriers, and synergistic effect between AgBr or Pd nanoclusters and BiVO 4 . [ABSTRACT FROM AUTHOR]