【摘 要】
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The controlled preparation of hexagonal tung-sten trioxide(h-WO3)nanostructures was achieved by adjusting the pH of the precursor solution.The effect of the pH
【机 构】
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College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Educati
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The controlled preparation of hexagonal tung-sten trioxide(h-WO3)nanostructures was achieved by adjusting the pH of the precursor solution.The effect of the pH on the morphology,elemental composition,and pho-tocatalytic performance of the samples was characterized via X-ray diffraction(XRD),scanning electron micro-scopy,energy dispersive X-ray spectroscopy,and Raman spectroscopy.Ultraviolet-visible(UV-Vis)spectra were used to evaluate the absorbance and the photocatalytic performance of methylene blue.Photoluminescence(PL),electrochemical impedance spectroscopy,photocurrent response and Brunauer-Emmett-Teller(BET)were used to study the optical properties,electrical performance,and specific surface area of the WO3-nanostructures,respec-tively.The results indicate that the WO3 nanorods prepared at pH=1.0 exhibit the highest photocatalytic performance(87.4％ in 1 h),whereas the WO3 nanoblocks prepared at pH=3.0 show the lowest.The photocatalytic performance of the one dimensional(1D)-nanorods can be attributed to their high specific surface area and charge transfer ability.The h-WO3 nanostructures were synthesized via a simple method and without a capping agent.They show an excellent photocatalytic performance,which is promising for their application in environment purification.
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