Effect of pH value on Morphology and Visible-light Photocatalytic Performance of Bi2MoO6 Crystallites
The Bi2MoO6 crystallites were synthesized by a simple hydrothermal method using (NH4)6Mo7O24·4H2O and Bi(NO3)3·5H2O as source materials and the effect of the pH value was studied on preparation of Bi2MoO6 crystallites.The samples were characterized by X-ray diffraction (XRD),scanning electron microscope (SEM),low temperature nitrogen adsorption-desorption,X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS).The results show that the pH value has great influence on the phase composition,morphology and photocatalytic performance of Bi2MoO6 crystallites.Pure Bi2MoO6 is obtained with pH values of 1 to 7 and Bi3.64Mo0.36O6.55 is produced when the pH value is 9 or 11.The morphology of Bi2MoO6 can be controlled from nanorods,nanosheets to nanoparticles by adjusting the pH value.The photocatalytic activity under visible light (λ ≥ 420 nm) and the effect of the pH value on the activity were evaluated using photocatalytic degradation of the Rhodamine B (RhB).The results indicate that the highest photocatalytic activity is obtained with the pH value of 7.Under visible light irradiation,the degradation rate of 5 mg·L-1 RhB within 50 min is 85％.
bismuth molybdate crystallitessimple hydrothermalphotocatalysispH valueRhodam B
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