Bi3.25La0.75Ti3O12纳米线的可见光催化性能

doi:10.3866/PKU.WHXB201205172

Abstract

Abstract:

Lanthanum-doped bismuth titanate (Bi_3.25La_0.75Ti₃O₁₂, BLT) nanowires were synthesized by a one-step hydrothermal process and their optical and photocatalytic properties were investigated. Their crystal structure and microstructures were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The BLT nanowires obtained are single-phase with an average diameter of 25 nm. The room temperature photoluminescence (PL) spectrum reveals two visible emission peaks at 400 and 596 nm, which are assigned to excitonic and surface-defect emissions, respectively. The UV-visible diffuse reflectance spectrum (UV-Vis DRS) reveals that the band gap of BLT nanowires is 2.07 eV. The prepared BLT nanowires are stable and exhibit higher photocatalytic activities in the degradation of methyl orange (MO) under visible light irradiation (λ >420 nm) compared with commercial P25 TiO₂, traditional N-doped TiO₂ (N-TiO₂), and pure bismuth titanate (Bi₄Ti₃O₁₂, BIT). The high photocatalytic performance of BLT photocatalysts is attributed to the strong visible light absorption and the recombination restraint of the e^-/h⁺ pairs resulting from the presence of La³⁺ ions.

Key words: Bismuth titanate, Lanthanum doping, Nanowire, Hydrothermal synthesis, Photocatalytic degradation, Visible light irradiation

MSC2000:

O643

LIN Xue, Lü Peng, GUAN Qing-Feng, LI Hai-Bo, LI Hong-Ji, CAI Jie, ZOU Yang. Visible Light Photocatalytic Properties of Bi_3.25La_0.75Ti₃O₁₂ Nanowires[J].Acta Phys. -Chim. Sin., 2012, 28(08): 1978-1984.

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Visible Light Photocatalytic Properties of Bi_3.25La_0.75Ti₃O₁₂ Nanowires

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Visible Light Photocatalytic Properties of Bi_3.25La_0.75Ti₃O₁₂ Nanowires