g-C3N4/BiVO4复合催化剂的制备及应用于光催化还原CO2的性能

doi:10.3866/PKU.WHXB201504015

Abstract

Abstract:

A visible-light-active graphitic-like carbon nitride (g-C₃N₄)/BiVO₄ nanocomposite photocatalyst was synthesized using a facile ultrasonic dispersion method. The nanocomposite was characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) spectroscopy, photoluminescence (PL) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, and photocurrent response measurements. The photocatalytic activity in the photoreduction of CO₂ under visible-light irradiation (λ>420 nm) was determined. The g-C₃N₄/BiVO₄ catalyst containing 40% (w) g-C₃N₄ showed the highest photocatalytic activity; it was almost twice that of g-C₃N₄ nanosheets and four times that of BiVO₄. The enhanced photocatalytic activity is attributed to the formation of heterostructures at the g-C₃N₄/BiVO₄ interface and appropriate alignment of the energy levels between them, which can facilitate separation of photogenerated electrons and holes.

Key words: Photocatalysis, CO₂ conversion, Methane, Carbon nitride, Bismuth vanadate

HUANG Yan, FU Min, HE Tao. Synthesis of g-C₃N₄/BiVO₄ Nanocomposite Photocatalyst and Its Application in Photocatalytic Reduction of CO₂[J].Acta Phys. -Chim. Sin., 2015, 31(6): 1145-1152.

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Synthesis of g-C₃N₄/BiVO₄ Nanocomposite Photocatalyst and Its Application in Photocatalytic Reduction of CO₂

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Synthesis of g-C₃N₄/BiVO₄ Nanocomposite Photocatalyst and Its Application in Photocatalytic Reduction of CO₂