NiO Flower-like Structure, Synthesis And Adsorption And Photocatalytic Properties Of NiO / AgCl Octahedron

The flowerlike architectures assembled from ultrathin NiO nanoflakes and NiO/AgCl octahedrons have been synthesized through hydrothermal and thermal decomposition method. The role of different complexing agent in the formation process of the NiO nanostructures with different morphologies has been investigated and the possible growth mechanisms have been proposed. In addition, the adsorption properties of the NiO flowerlike architectures assembled with ultrathin NiO nanoflakes and the photocatalytic activity of NiO/AgCl octahedrons for the malachite green and acid red have been investigated.(1) Synthesis and formation mechanism of flowerlike architectures assembled from ultrathin NiO nanoflakes and their adsorption:The flowerlike architectures assembled from ultrathin NiO nanoflakes have been synthesized by a hydrothermal reaction of Ni(NO3)2with H2O in the presence of glycerin and subsequent annealing at400℃for2h in air. The role of glycerin in the formation of the Ni(OH)2·0.75H2O flowerlike nanoarchitectures was investigated, and a possible mechanism was proposed to understand the formation and self-assembly evolution process of Ni(OH)2·0.75H2O nanoflakes. The NiO flowerlike nanoarchitectures served as the adsorbent for malachite green (MG) and acid red (AR) in water, and the adsorption capacity for MG and AR are142.08and64.23mg/g, respectively.(2) Synthesis and photocatalytic activity of NiO/AgCl octahedrons:The NiO/AgCl octahedrons with increasing sizes were synthesized by dispersing NiO octahedrons obtained at400℃in AgNO3aqueous solution. The role of Ag+in the formation of the NiO/AgCl octahedrons nanoarchitectures was investigated, and the possible formation mechanism were proposed to understand the formation. The photocatalytic properties of the as-prepared NiO/AgCl octahedrons were investigated. The results suggest that the as-obtained NiO/AgCl octahedrons nanoarchitectures show higher photocatalytic activity than commercial TiO2powder for degradation of malachite green.