کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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46979 | 46454 | 2011 | 8 صفحه PDF | دانلود رایگان |
Bi12TiO20 complex architectures (BiT) with flower-, spindle- and jujube-like shapes, were prepared through a facile template-free hydrothermal process, by controlling the reaction parameters, such as temperature, reagent concentration, and reaction time. Within the hydrothermal temperature range from 150 to 200 °C, the morphology transformed progressively from microjujube to microflowers consisted with nanospindles. A possible growth mechanism for BiT architectures was proposed to explain the transformation of nanoparticles to microflowers via an Ostwald ripening mechanism followed by self-assembly. Most importantly, much higher photocatalytic activities of BiT spindle-like structures modified with 0.5% polyaniline (PANI) via a simple chemisorption approach in comparison with unmodified BiT were obtained for the degradation of Rhodamine B (RhB) solution under visible-light irradiation (λ > 420 nm). Furthermore, an enhanced photocatalytic performance for RhB degradation was also observed with the assistance of a small amount of H2O2. The reason could be ascribed to the synergic effect between PANI and BiT, which promoted the migration efficiency of photogenerated electron-hole on the interface of PANI and BiT, demonstrating that PANI/BiT architecture is a promising candidate as a visible light photocatalyst.
Bi12TiO20 and PANI/Bi12TiO20 complex architectures with flower-, spindle- and jujube-like shapes, were prepared through a facile template-free hydrothermal process with assistance of a simple chemisorption approach and the morphologies, growth mechanism and visible-light photocatalytic properties of these architectures were investigated.Figure optionsDownload as PowerPoint slideHighlights
► Bi12TiO20 complex architectures (BiT) with flower-, spindle- and jujube-like shapes, were prepared through a facile template-free hydrothermal process.
► A possible growth mechanism for BiT architectures is proposed via an Ostwald ripening mechanism followed by self-assembly.
► Much high photocatalytic activities of BiT with 0.5% PANI were obtained for the degradation of RhB under visible-light irradiation.
► An enhanced photocatalytic performance for PANI/BiT architectures was also observed with the assistance of a small amount of H2O2.
Journal: Applied Catalysis B: Environmental - Volume 104, Issues 3–4, 18 May 2011, Pages 399–406