摘要
In recent years, much effort has been focused on the development of the photocatalysts with high performance under visible light irradiation. In this paper, three-dimensional porous La-doped SrTiO3 （LST） micro- spheres were prepared by a modified sol-gel method, in which the agarose gel/SrCO3 microsphere and La2O3 were employed as the template and the La resource, respectively. The as-prepared LST microspheres exhibit a porous structure with a diameter of about 10 μm and a surface pore size of about 100 nm. The La element was doped into the crystal lattice of SrTiO3 by the substitution of La^3＋ for Sr^2＋. Therefore, the absorption edge of LST samples shifts toward the visible light region, and their photocatalytic activity for the Cr（VI） reduction is enhanced under visible light. Among all LST samples, LST-0.5 （the La^3＋ doping content is 0.5 wt-%） exhibited the highest visible-light photocatalytic activity, which can reduce 84% Cr（VI） within 100 rain. This LST materials may become a promising photocatalyst for the facile treatment of waste- water containing poisonous heavy metal ions.
In recent years, much effort has been focused on the development of the photocatalysts with high performance under visible light irradiation. In this paper, three-dimensional porous La-doped SrTiO3 （LST） micro- spheres were prepared by a modified sol-gel method, in which the agarose gel/SrCO3 microsphere and La2O3 were employed as the template and the La resource, respectively. The as-prepared LST microspheres exhibit a porous structure with a diameter of about 10 μm and a surface pore size of about 100 nm. The La element was doped into the crystal lattice of SrTiO3 by the substitution of La^3＋ for Sr^2＋. Therefore, the absorption edge of LST samples shifts toward the visible light region, and their photocatalytic activity for the Cr（VI） reduction is enhanced under visible light. Among all LST samples, LST-0.5 （the La^3＋ doping content is 0.5 wt-%） exhibited the highest visible-light photocatalytic activity, which can reduce 84% Cr（VI） within 100 rain. This LST materials may become a promising photocatalyst for the facile treatment of waste- water containing poisonous heavy metal ions.
