Abstract
The inherent drawbacks of Bi2O3 greatly limit the practical application of Bi2O3, thus it is crucial to boost the photocatalytic activity of Bi2O3, and therefore NiO was employed to couple with Bi2O3. In this paper, NiO/Bi2O3 heterostructures with improved sunlight driven -photocatalytic activity were constructed by a pore impregnating method. The samples were studied by Brunauer -Emmett- Teller (BET) method, X-ray diffraction (XRD), UV–Vis diffuse reflectance spectroscopy (DRS), high-resolution transmission electron microscopy (HRTEM), surface photovoltage (SPV) spectroscopy and electron spin-resonance (ESR) spectroscopy. The photocatalytic activities of NiO/Bi2O3 heterostructures toward discoloration of methyl orange (MO) aqueous solutions were evaluated. The results display that the presence of NiO in the heterojuctions increases the specific surface area, the absorbance in the visible light region, the separation rate of the photo-induced charge pairs and the formation of ·O2− in the photocatalytic system.
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