Preparation、Modified And Photocatalytic Properties Of α-MoO₃ Nanobelts

In recent years, photocatalytic technology have attracted widespread attentions as promising methods for they can clean up environmental. However, its poor natural light absorption capability and the rapid recombination of photogenerated electrons-holes significantly limit the broad practical application. α-Mo O3, as a wide band gap n-type semiconductor, is a very promising material for use in both UV and visible light due to appropriate ionic character and unique layered structure. Hence, we devoted to hydrothermal synthesis and modification of α-Mo O3 nanobelts, furthermore improve their photocatalytic activities. The main contents are as follows:(1) Without template and agent, the α-Mo O3 nanobelts were synthesized by hydrothermal method and characterized by XRD、SEM-EDS、UV-Vis DRS、TEM. The effect of hydrothermal condition(such as temperature, reaction time) on morphology and performance of the α-Mo O3 nanobelts have been explored. The results showed that the α-Mo O3 nanobelts has high crystallinity degree and uniform morphology and size with a length of about 5μm and width of about 0.2μm at 180℃for 12 h.(2) The photocatalytic activities of the α-Mo O3 nanobelts have been system studied for degradation of Rhodamine B. The effects of reaction condition(such as light sources、p H、dosage of catalyst) on photocatalytic activities of the α-Mo O3 nanobelts have been explored. The results showed that the α-Mo O3 nanobelts exhibited the high photocatalytic activity with 250 W metal halide lamp as the light source by 1.5g·L-1 amount of catalyst used, its photocatalytic degradation rate could be up to 96% with 70 min, which is superior to the catalytic activities of commodity Mo O3 and P25(Ti O2). The optimum photocatalytic activity of the α-Mo O3 nanobelts under visible light irradiation was almost 3.7 and 2.3 times as high as that of commodity Mo O3 and P25(Ti O2), respectively. The degradation percentage of Rh B have been remains above 90% after five cycles, which exhibited the α-Mo O3 nanobelts has a stable photocatalytic properties and not easy to corrosion by the light.(3) The composite photocatalyst Fe2O3/α-Mo O3 has been fabricated by depostion method and its composition, morphology, and photo-adsorption properties of were characterized by XRD、SEM-EDS、UV-Vis DRS. The photocatalytic activity of the Fe2O3/α-Mo O3 composite photocatalyst has also explored with Rh B as the model pollutant. The test results showed that the composite photocatalyst Fe2O3/α-Mo O3 have broad spectral response range and high photocatalytic activity. 1.0%wt Fe2O3/α-Mo O3 as photocatalyst, the degradation rate of Rh B could reached more than 90% with 40 minutes.