Synthesis and photocatalytic properties of visible-light-responsive, three-dimensional, flower-like La–TiO2/g-C3N4 heterojunction composites

摘要

We prepared a new three-dimensional, flower-like La–TiO _(2) /g-C _(3) N _(4) (LaTiCN) heterojunction photocatalyst using a solvothermal method. Analysis and characterization were performed by conducting scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform-infrared spectroscopy, ultraviolet-visible spectrophotometry, and nitrogen adsorption and desorption. The prepared g-C _(3) N _(4) nanosheets could reach 100 nm in size and covered the TiO _(2) surface. A tightly bound interface formed between the g-C _(3) N _(4) and TiO _(2) , speeding up the effective transfer of photo-induced electrons. In addition, the incorporation of La ~(3+) reduced the electron–hole recombination efficiency. Consequently, the prepared La–TiO _(2) /g-C _(3) N _(4) composite material exhibited better visible-light catalytic activity than pure TiO _(2) .