Abstract
Fe-ions modified mesoporous Bi2WO6 nanosheets (Fe-Bi2WO6) were successfully synthesized via a simple two-step method, which involved a template-free hydrothermal process and a following impregnation treatment. The resultant products were characterized by XRD, TEM, XPS, EDX, ESR, UV–Vis, PL, and visible light photocatalytic measurements. Experimental results indicated that the addition of a small amount Fe-ions (optimized content at 0.1wt.%) could evidently improve the activity of Bi2WO6. The apparent reaction rate of Fe-Bi2WO6-0.1% (k, 0.099min−1) was 3.2 times higher than that of Fe-Bi2WO6-0% (k, 0.031min−1). The Fe-ions mainly existed as Fe3+ and Fe2+ ions, which were uniformly distributed on the surface of Bi2WO6 nanosheets and some Fe3+-ions substituted Bi3+-ions in Bi2O2 layers. Both of the concentration and state of Fe-ions played vital factors for the improved visible light photocatalytic activities.
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