不同形貌Bi4Ti3O12粒子的可控合成及光催化性能

doi:10.3866/PKU.WHXB201211211

Abstract

Abstract:

Bismuth titanate (Bi₄Ti₃O₁₂, BIT) particles with different morphologies were synthesized by a one-step hydrothermal process and their optical and photocatalytic properties were investigated. The crystal structure and microstructures were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). XRD patterns demonstrate that the as-prepared BIT samples have layered perovskite structure. FESEM shows that BIT crystals can be fabricated in different morphologies by simply manipulating the reaction parameters of the hydrothermal process. The UV-visible diffuse reflectance spectra (UV-Vis DRS) reveal that the band gaps of the BIT photocatalysts are about 2.88-2.93 eV. The as-prepared BIT photocatalysts exhibit higher photocatalytic activities toward the degradation of methyl orange (MO) under visible light irradiation (λ>420 nm) when compared with traditional N-doped TiO₂ (N-TiO₂). The influence of morphology on the photocatalytic properties of BIT was also studied. BIT nanobelt structures displayed the highest photocatalytic activity. Up to 95.0% MO was decolorized after visible light irradiation for 360 min.

Key words: Bi₄Ti₃O₁₂, Nanosphere, Nanoplate, Nanobelt, Controllable synthesis, Photocatalytic degradation

LIN Xue, GUAN Qing-Feng, LIU Ting-Ting, ZHANG Yao, ZOU Chun-Jie. Controllable Synthesis and Photocatalytic Activity of Bi₄Ti₃O₁₂ Particles with Different Morphologies[J]. Acta Phys. -Chim. Sin. 2013, 29(02), 411-417. doi: 10.3866/PKU.WHXB201211211

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Controllable Synthesis and Photocatalytic Activity of Bi₄Ti₃O₁₂ Particles with Different Morphologies

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Controllable Synthesis and Photocatalytic Activity of Bi₄Ti₃O₁₂ Particles with Different Morphologies