Fabrication of Bi2MoO6 Nanosheets/TiO2 Nanorod Arrays Heterostructures for Enhanced Photocatalytic Performance under Visible-Light Irradiation

Abstract

Bi2MoO6/TiO2 heterostructures (HSs) were synthesized in the present study by growing Bi2MoO6 nanosheets on vertically aligned TiO2 nanorod arrays using a two-step solvothermal method. Their morphology and structure were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Excellent visible-light absorption was observed by UV–Vis absorption spectroscopy, which was attributed to the presence of the Bi2MoO6 nanosheets with a narrow-band-gap. The specific surface area and pore volume of the photocatalysts were significantly increased due to the hierarchical structure composed of Bi2MoO6 nanosheets and TiO2 nanorods. The photoluminescence and photoelectrochemical characterizations showed improved separation and collection efficiency of the Bi2MoO6/TiO2 HSs towards the interface charge carrier. The photocatalytic analysis of the Bi2MoO6/TiO2 HSs demonstrated a significantly better methylene blue (MB) degradation efficiency of 95% within 3 h than pristine TiO2 nanorod arrays under visible-light irradiation. After three photocatalytic cycles, the degradation rate remained at ~90%. The improved performance of the Bi2MoO6/TiO2 HSs was attributed to the synergy among the extended absorption of visible light; the large, specific surface area of the hierarchical structure; and the enhanced separation efficiency of the photogenerated electron-hole pairs. Finally, we also established the Bi2MoO6/TiO2 HSs band structure and described the photocatalytic dye degradation mechanism. The related electrochemical analysis and free-radical trapping experiments indicated that h+, ·O2− and ·OH have significant effects on the degradation process.

Pd Nanoparticle-Decorated Novel Ternary Bi2O2CO3-Bi2MoO6-CuO Heterojunction for Enhanced Photo-electrocatalytic Ethanol Oxidation

“…The photocurrent response diminished quickly once the light is switched off. 14 , 25 , 26 The figure reveals the higher responsive photocurrents of the Pd/BM-BOCC quaternary catalyst owing to enhanced light absorption and better interfacial charge transfer 54 , 82 of the quaternary catalyst during ethanol photo-oxidation.…”

“…To measure the photoelectric properties of the synthesized nanocatalysts, the photocurrent response measurement of Pd/BM-BOC, Pd/CuO, and Pd/BM-BOCC was performed at −0.3 V potential vs SCE by interrupting visible light with a duration of 50s as shown in Figure b. The photocurrent response diminished quickly once the light is switched off. ,, The figure reveals the higher responsive photocurrents of the Pd/BM-BOCC quaternary catalyst owing to enhanced light absorption and better interfacial charge transfer , of the quaternary catalyst during ethanol photo-oxidation.…”

Preparation of a Co3O4/Bi2MoO6 P‐N‐Type Heterojunction with Enhanced Photocatalytic Activity and Synergistic PMS Enrofloxacin Degradation

“…The band positions of Co 3 O 4 and Bi 2 MoO 6 shown in Figure 6c differ from those of pure substances reported in the literature. [18,48] The possible reason is that when Co 3 O 4 is loaded on Bi 2 MoO 6 , the energy band position of the semiconductor changes until a new Fermi level equilibrium is established, and an internal electric field is also formed. As can be seen from the figure , a ).…”

BiOI/Bi2MoO6 p-n Junction to Enhance Visible Light Photocatalytic Activity toward Environmental Remediation

“…An attractive n-type Bi 2 MoO 6 , as an excellent visible light-responsive semiconductor with the special perovskite-like layer structure, has attracted great attention on environmental remediation due to its innocuity and stability. − Various hierarchical structures including hollow spheres, , flower-like microstructures, − and intercrossed nanostructures and different kinds of heterojunctions, such as Bi 2 MoO 6 /TiO 2 , Bi 2 MoO 6 /BiOCl, Bi 2 MoO 6 /BiOBr, and so forth, have been explored for application in pollutant degradation. In our previous research, a novel type of 0D/2D phase junction was designed, Bi 4 MoO 9 /Bi 2 MoO 6 , which exhibited an excellent photocatalytic performance due to the efficient charge separation .…”