Facile synthesis and visible-light photocatalytic activity of bismuth titanate nanorods |
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Authors: | Jungang Hou Shuqiang Jiao Hongmin Zhu R V Kumar |
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Institution: | (1) State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China;(2) Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB2 3QZ, United Kingdom |
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Abstract: | Highly crystalline bismuth titanate (Bi12TiO20, BiT) nanorods, as visible-light photocatalysts were prepared by a template-free hydrothermal process. The as-prepared BiT
nanorods fabricated in high yields by simply manipulating pH values in the absence of any capping agent, were characterized
by a number of techniques, such as XRD, SEM, TEM, HRTEM, BET, and UV–Vis spectrum. In this case, hydroxide ions seem to play
a pivotal role in controlling the formation of seeds and the growth of the BiT nanorods. Based on the structural analysis
of nanocrystals obtained at different pH values, we proposed a plausible mechanism to account for the formation of the tunable
morphologies. Most importantly, the BiT nanorods with good stability exhibited higher photocatalytic activities in the degradation
of Rhodamine B under visible light irradiation (λ ≥ 420 nm) than the commercial P25 TiO2 and bulk BiT powders, demonstrating that Bi12TiO20 is a promising candidate as a visible-light photocatalyst. |
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