摘要
Visible-light-active Gd-N codoped porous TiO2（Gd-N-TiO2） photocatalyst was fabricated by an evapora-tion-induced self-assembly route using surfactants as structure-directed agents. As-prepared samples were characte-rized by X-ray diffraction, field-emission scalming electron microscopy, transmission electron microscopy（TEM）,X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller（BET） method, and ultraviolet-visible absorption spec-troscopy. The results indicated that synergistic reaction occurred when codoping with Gd^3＋ and N, which enhancedthe light absorption properties of TiO2. Irregular worm-like particles with wide interparticle spaces were clearlyobserved by TEM. The average particle size of Gd-N-TiO2 decreased to ca. 8 nm because co-doping inhibited theparticles growth significantly. Thus, the specific surface area of Gd-N-TiO2（198.7 m^2/g） was higher than that ofDegussa P25 TIO2（50 m^2/g）. Gd-N-TiO2 exhibited a high photocatalytic activity toward methyl orange degradationunder UV-Vis or visible-light irradiation. The Gd-N-TiO2 catalyst also presented a stable performance without losingactivity after four successive photocatalytic experiments. The facile synthesis and excellent activity of Gd-N-TiO2indicated its great potential as industrial catalysts for wastewater treatment.
