摘要：

A large-scale boehmite (-AlOOH) sphere and NiWO4-coated boehmite micro/nanostructured materials were synthesized via a facile two-step hydrothermal method with microwave irradiation using a solution phase route. The morphologies and structures of the prepared samples were characterized by scanning electron microscopy, high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction, Fourier transform infrared spectroscopy, and energy-dispersive X-ray spectroscopy, and their optical and photocatalytic properties were also measured. The samples boehmite, AN1 and AN2 (different concentrations by NiWO4) were evaluated under UV/visible-light irradiation, and the AN1 sample showed intense (92.6%) degradation of methyl blue dye of the three samples. This enhancement was explained reasonably by HR-TEM evaluated surface-coated core-shell structured -AlOOH@NiWO4 shell width was about 10-15nm and the core-shell size 120nm. From the optical analysis, the core-shell heteronanostructure new energy level was attributed to the synergistic effect between NiWO4 and boehmite. In particular, a down-conversion luminescence process at the 450nm excited energy optimization of redox for the efficient photogeneration of electron-hole pairs. Additionally, trapping measurement showed that O-2 ( -) and OH species generated in the photocatalytic process played a key role in the degradation reaction . Based on these findings, this approach may offer a new strategy for the fabrication of surface-controlled spheres of core/shell structure-based photocatalysts with enhanced efficiency for environmental remediation applications.

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