Abstract
To overcome the recovery disadvantages of Bi2O3 photocatalyst in the form of powder, Bi2O3 photocatalyst coatings were developed via a ball milling, followed by the calcination method. The composition and structure evolution rules of the as-synthesized samples were analyzed based on XRD (X-ray powder diffraction) patterns and SEM (scanning electron microscope) observations. XPS (X-ray photoelectron spectroscopy) and UV-Vis (Ultraviolet-visible) spectra were also employed to characterize the samples. The results showed that monoclinic Bi2O3 coatings were obtained after sintering Bi coatings at 673 or 773 K for 2 h, while calcination at a higher temperature and for a longer time resulted in monoclinic and triclinic mixed-phase Bi2O3 coatings. Bi2O3 coatings with a radial growth structure assembled by nanosheets could be realized at a lower temperature lasting for a longer time, while sintering at a higher temperature with relatively short oxidation time led to tangential growth structure. Photodegradation of malachite green solution under simulated solar irradiation for 180 min showed that the largest degradation efficiency of 91.49% was achieved over the photocatalyst coatings calcined at 873 K for 5 h. Additionally, the degradation efficiency was maintained above 80% even after three cycles.
Highlights
Nowadays, environmental pollution and energy crisis cause extremely severe and destructive effects for human health and society development
Bi2O3 photocatalyst coatings were developed via a ball milling followed by the thermal oxidation method
The results showed that monoclinic Bi2O3 coatings were obtained at 673 or 773K for 2h, while oxidation at a higher temperature and a longer
Summary
Environmental pollution and energy crisis cause extremely severe and destructive effects for human health and society development. TiO2 -based photocatalysts which are always being ranked as the most researched ones [4,5,6] Their applications are retarded by low ultilization efficiency for solar light absorption or a high recombination of charge carriers, making development of photocatalysts with visible light responsive ability indispensable. The results showed that the Bi2 O3 /HZSM-5 composite photocatalyst acquires the highest photocatalytic activity for rhodamine B degradation at the optimal loading with 18 wt % Bi2 O3 and proposed the synergistic effect between HZSM-5 and Bi2 O3 , namely, the special structure of HZSM-5 increased the number of the active sites to adsorb more dye molecules and photodegraded them on the Bi2 O3 photocatalyst. The optical properties and the photo-degradation performances of the samples were studied with the aim of providing a new type of bismuth-based semiconductor photocatalyst coating that is applicable to practical water cleaning or other contaminants disposal
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